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  • 1.
    Ambashta, Ritu D.
    et al.
    Bhabha Atom Res Ctr, India.
    Bhatnagar, Amit
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Sillanpää, Mika E. T.
    Lappeenranta Univ Technol, Finland.
    Supported iron-based catalysts under influence of static magnetic field for the removal of TBP and EDTA2015Ingår i: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 54, nr 10, s. 2700-2709Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Zerovalent metals offer decontamination of organic toxins in aqueous medium. In the present study, alumina-based iron and iron-nickel in the presence and the absence of magnetic field for the decontamination of tributyl phosphate (TBP) and ethylene diamine tetraacetic acid (EDTA) has been compared. TBP decontamination was improved in the presence of zerovalent metals. EDTA decontamination was not enhanced in the presence of zerovalent metals. The decontamination of TBP using iron-based alumina was higher than iron-nickel. The surface interaction on alumina surface, as characterized by attentuated total reflectance-Fourier transform infrared spectroscopy, and the surface interaction on metallic elements, as characterized by evaluating the magnetic moment values helped to understand the reason for the difference in role of alumina-based iron and iron-nickel on decontamination of TBP and EDTA.

  • 2.
    Bhatnagar, Amit
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    A Note on the Advances in Adsorption Technology for Water Treatment: Progress and Challenges2012Ingår i: Application of Adsorbents for Water Pollution Control / [ed] Amit Bhatnagar, Bentham eBooks, 2012, s. 523-528Kapitel i bok, del av antologi (Refereegranskat)
  • 3.
    Bhatnagar, Amit
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Application of Adsorbents for Water Pollution Control2012Samlingsverk (redaktörskap) (Refereegranskat)
  • 4.
    Bhatnagar, Amit
    Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
    Removal of bromophenols from water using industrial wastes as low-cost adsorbents2007Ingår i: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. B139, s. 93-102Artikel i tidskrift (Refereegranskat)
  • 5. Bhatnagar, Amit
    et al.
    Bernardo, C.M.R
    Klein, M.
    Vilar, V.J.P.
    Botelho, C.M.S.
    Boaventura, R.A.R.
    Chemical modification of algae binding groups for optimization of Ni biosorption2011Konferensbidrag (Refereegranskat)
  • 6.
    Bhatnagar, Amit
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Boaventura, R.A.R.
    Vilar, V.J.P.
    Botelho, C.M.S.
    Biosorption of nickel on chemically modified algae2012Konferensbidrag (Övrigt vetenskapligt)
  • 7.
    Bhatnagar, Amit
    et al.
    Department of Environmental Engineering (YIEST), Yonsei University, Wonju 220-710, Gangwon-do, South Korea.
    Choi, J
    Kumar, E
    Ji, M
    Jung, W
    Jeon, BH
    Kang, JW
    Bromate removal from drinking water by granular ferric hydroxide (GFH)2008Konferensbidrag (Refereegranskat)
  • 8. Bhatnagar, Amit
    et al.
    Choi, JA
    Kumar, Eva
    Paeng, KJ
    Lee, JC
    Jeon, BH
    Removal of Perchlorate from Water by Granular Ferric Hydroxide (GFH)2009Konferensbidrag (Refereegranskat)
  • 9. Bhatnagar, Amit
    et al.
    Choi, Yang-Hun
    Ji, MinKyu
    Oh, Byung-Soo
    Jeon, Byong-Hun
    Kang, Joon-Wun
    Removal of Nitrate in ground water by GAC dopped with ZnCl22007Konferensbidrag (Refereegranskat)
  • 10. Bhatnagar, Amit
    et al.
    Choi, Yang-Hun
    Jung, Yeon-Jung
    Jeon, Byong-Hun
    Kang, Joon-Wun
    Removal of bromate from drinking water by GFH adsorption2007Konferensbidrag (Refereegranskat)
  • 11.
    Bhatnagar, Amit
    et al.
    Department of Environmental Engineering (YIEST), Yonsei University, Wonju 220-710, Gangwon-do, South Korea.
    Choi, Y.H.
    Yoon, Y.J.
    Shin, Y.
    Jeon, B.H.
    Kang, J.W.
    Bromate removal from water by granular ferric hydroxide (GFH)2009Ingår i: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 170, nr 1, s. 134-140Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The feasibility of granular ferric hydroxide (GFH) for bromate removal from water has been studied. Batch experiments were performed to study the influence of various experimental parameters such as effect of contact time, initial bromate concentration, temperature, pH and effect of competing anions on bromate removal by GFH. The adsorption kinetics indicates that uptake rate of bromate was rapid at the beginning and 75% adsorption was completed in 5 min and equilibrium was achieved within 20 min. The sorption process was well described by pseudo-second-order kinetics. The maximum adsorption potential of GFH for bromate removal was 16.5 mg g−1 at 25 °C. The adsorption data fitted well to the Langmuir model. The increase in OH peak and absence of Br–O bonding in FTIR spectra indicate that ion-exchange was the main mechanism during bromate sorption on GFH. The effects of competing anions and solution pHs (3–9) were negligible. Results of the present study suggest that GFH can be effectively utilized for bromate removal from drinking water.

  • 12.
    Bhatnagar, Amit
    et al.
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Hogland, William
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Marques, Marcia
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM). Univ Estado Rio De Janeiro, Dept Sanit & Environm Engn, UERJ, Rio De Janeiro, Brazil.
    Sillanpaa, Mika
    Lappeenranta Univ Technol, Fac Technol, FI-50100 Mikkeli, Finland.
    An overview of the modification methods of activated carbon for its water treatment applications2013Ingår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 219, s. 499-511Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Activated carbon has been recognized as one of the oldest and widely used adsorbent for the water and wastewater treatment for removing organic and inorganic pollutants. The application of activated carbon in adsorption process is mainly depends on the surface chemistry and pore structure of porous carbons. The method of activation and the nature of precursor used greatly influences surface functional groups and pore structure of the activated carbon. Therefore, the main focus of researchers is to develop or modifies the activation/treatment techniques in an optimal manner using appropriate precursors for specific pollutants. In recent years, emphasis is given to prepare the surface modified carbons using different procedures to enhance the potential of activated carbon for specific contaminants. Various methods such as, acid treatment, base treatment, impregnation treatment, ozone treatment, surfactant treatment, plasma treatment and microwave treatment have been studied to develop surface modified activated carbons. In this paper, these modification methods have been reviewed and the potential of surface modified activated carbons towards water treatment has been discussed. This review article is aimed at providing precise information on efforts made by various researchers in the field of surface modification of activated carbon for water pollution control. (C) 2012 Elsevier B.V. All rights reserved.

  • 13.
    Bhatnagar, Amit
    et al.
    Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
    Jain, A.K.
    A comparative adsorption study with different industrial wastes as adsorbents for the removal of cationic dyes2005Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 281, s. 49-55Artikel i tidskrift (Refereegranskat)
  • 14. Bhatnagar, Amit
    et al.
    Jain, AK
    Utilization of industrial wastes for the removal of phenolic pollutants from aqueous solutions2003Konferensbidrag (Refereegranskat)
  • 15. Bhatnagar, Amit
    et al.
    Jain, A.K.
    Gupta, V.K.
    Jain, S.
    Suhas, S.
    A comparative assessment of adsorbents prepared from industrial wastes for the removal of cationic dye2003Ingår i: Journal of the Indian Chemical Society, ISSN 0019-4522, Vol. 80, s. 267-270Artikel i tidskrift (Refereegranskat)
  • 16.
    Bhatnagar, Amit
    et al.
    Department of Chemistry , Indian Institute of Technology (I.I.T.) Roorkee, Roorkee, India.
    Jain, A.K.
    Minocha, A.K.
    Singh, S.
    Removal of lead ions from aqueous solutions by different types of industrial waste materials: equilibrium and kinetic studies2006Ingår i: Separation science and technology (Print), ISSN 0149-6395, E-ISSN 1520-5754, Vol. 41, s. 1181-1192Artikel i tidskrift (Refereegranskat)
  • 17. Bhatnagar, Amit
    et al.
    Jain, A.K.
    Mukul, MK
    Utilization of industrial wastes for the removal of congo red dye from water2003Konferensbidrag (Refereegranskat)
  • 18. Bhatnagar, Amit
    et al.
    Jeon, BH
    Uranuim biogeochemistry : Focusing on interfacial redox reactions2008Konferensbidrag (Refereegranskat)
  • 19. Bhatnagar, Amit
    et al.
    Jeon, Byong-Hun
    Ji, Minkyu
    Choi, Yanghun
    Cho, Dongwan
    Jung, Woosik
    Kang, Joon-Wun
    Nitrate removal from water by surface modified granular activated carbons: Equilibrium and kinetic studies2007Konferensbidrag (Refereegranskat)
  • 20.
    Bhatnagar, Amit
    et al.
    Department of Environmental Engineering , Yonsei University , South Korea.
    Ji, M.
    Department of Environmental Engineering , Yonsei University , South Korea.
    Choi, Y.H.
    Department of Environmental Engineering , Yonsei University , South Korea.
    Jung, W.
    Department of Environmental Engineering , Yonsei University , South Korea.
    Lee, S.H.
    Kim, S.J.
    Department of Environmental Engineering , Yonsei University , South Korea.
    Lee, G.
    Suk, H.
    Kim, H.S.
    Min, B.
    Kim, S.H.
    Jeon, B.H.
    Kang, J.W.
    Removal of nitrate from water by adsorption onto zinc chloride treated activated carbon2008Ingår i: Separation science and technology (Print), ISSN 0149-6395, E-ISSN 1520-5754, Vol. 43, s. 886-907Artikel i tidskrift (Refereegranskat)
  • 21. Bhatnagar, Amit
    et al.
    Ji, Min-Kyu
    Ahn, Yong-Tae
    Choi, Young-Keun
    Noh, Soo-Hong
    Lee, Soo-Cheol
    Cho, Dong-Wan
    Jung, Woo-sik
    Jeon, Byong-Hun
    Nitrate removal from water using zero-valent iron (ZVI) combined media2009Konferensbidrag (Refereegranskat)
  • 22. Bhatnagar, Amit
    et al.
    Ji, Minkyu
    Choi, Yanghun
    Jung, Woosik
    Jeon, Byong-Hun
    Kang, Joon-Wun
    A comparative study of nitrate removal from aqueous solutions using zinc chloride treated granular activated carbons2007Konferensbidrag (Refereegranskat)
  • 23. Bhatnagar, Amit
    et al.
    Ji, Minkyu
    Jung, Woosik
    Jeon, Byong-Hun
    Modeling of the adsorption kinetic of nitrate onto ZnCl2 treated granular activated carbon2007Konferensbidrag (Refereegranskat)
  • 24. Bhatnagar, Amit
    et al.
    Ji, MK
    Ahn, YT
    Kim, SW
    Lee, S.
    Jeon, BH
    Performance evaluation of zero-valent iron systems for nitrate removal from water2009Konferensbidrag (Refereegranskat)
  • 25. Bhatnagar, Amit
    et al.
    Ji, MK
    Ahn, YT
    Kumar, E
    Jeon, BH
    Nitrate removal from groundwater by a hybrid system of  zero-valent iron combined with adsorbents2009Konferensbidrag (Refereegranskat)
  • 26. Bhatnagar, Amit
    et al.
    Johnsson, Annette
    Factors affecting chromium solubility in hydrated cement pastes2005Konferensbidrag (Refereegranskat)
  • 27. Bhatnagar, Amit
    et al.
    Johnsson, Annette
    Predicting heavy metal and metalloid solubility from solid-phase concentrations: A progress report2006Konferensbidrag (Refereegranskat)
  • 28. Bhatnagar, Amit
    et al.
    Johnsson, Annette
    Studies on the binding mechanisms of metals and metalloids in cementitious matrices: case study with chromium2005Rapport (Refereegranskat)
  • 29. Bhatnagar, Amit
    et al.
    Johnsson, Annette
    Leuz, Ann-Kathrin
    Heavy metal and oxyanion binding in fresh and carbonated hydrated Ordinary Portland cement pastes2009Konferensbidrag (Refereegranskat)
  • 30.
    Bhatnagar, Amit
    et al.
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Kaczala, Fabio
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Hogland, William
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Marques, Marcia
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM). Univ Estado Rio De Janeiro, Dept Sanit & Environm Engn, UERJ, Rio De Janeiro, Brazil.
    Paraskeva, Christakis A.
    Papadakis, Vagelis G.
    Sillanpaa, Mika
    Valorization of solid waste products from olive oil industry as potential adsorbents for water pollution control-a review2014Ingår i: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 21, nr 1, s. 268-298Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    The global olive oil production for 2010 is estimated to be 2,881,500 metric tons. The European Union countries produce 78.5 % of the total olive oil, which stands for an average production of 2,136,000 tons. The worldwide consumption of olive oil increased of 78 % between 1990 and 2010. The increase in olive oil production implies a proportional increase in olive mill wastes. As a consequence of such increasing trend, olive mills are facing severe environmental problems due to lack of feasible and/or cost-effective solutions to olive-mill waste management. Therefore, immediate attention is required to find a proper way of management to deal with olive mill waste materials in order to minimize environmental pollution and associated health risks. One of the interesting uses of solid wastes generated from olive mills is to convert them as inexpensive adsorbents for water pollution control. In this review paper, an extensive list of adsorbents (prepared by utilizing different types of olive mill solid waste materials) from vast literature has been compiled, and their adsorption capacities for various aquatic pollutants removal are presented. Different physicochemical methods that have been used to convert olive mill solid wastes into efficient adsorbents have also been discussed. Characterization of olive-based adsorbents and adsorption mechanisms of various aquatic pollutants on these developed olive-based adsorbents have also been discussed in detail. Conclusions have been drawn from the literature reviewed, and suggestions for future research are proposed.

  • 31. Bhatnagar, Amit
    et al.
    Klein, M.
    Vilar, V.J.P.
    Botelho, C.M.S.
    Boaventura, R.A.R.
    Bernando, C.M.R.
    Optimization of nickel biosorption on surface modified algae2011Konferensbidrag (Refereegranskat)
  • 32.
    Bhatnagar, Amit
    et al.
    Chemical Engineering Department, LSRE – Laboratory of Separation and Reaction Engineering, University of Porto (FEUP), Rua Dr. Roberto Frias, Porto, 4200-465, Portugal .
    Kumar, Eva
    Ion exchange Technology: A promising Approach for Anions Removal from Water2012Ingår i: Ion exchange Technology II: Applications, Springer, 2012, 1, s. 413-434Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    Water pollution due to increased agricultural, industrial, and domestic activities has become a serious concern worldwide. Various toxic pollutants have been detected in drinking water sources at alarming levels. Anionic pollutants, one of the important classes of aquatic pollutants, need special attention for their removal from water as usually there will be no organoleptic changes in water when anions are present even at low concentrations, thereby increasing the health risks. Ion exchange (IE) technology has been proven as one of the best technologies for water and wastewater treatment. In this review, a compilation of various IE materials reported in the vast literature, used for the removal of various anions (nitrate, fluoride, perchlorate, arsenate, chromate, phosphate, thiocyanate, etc.) from water, has been presented, and their main findings are discussed.

  • 33. Bhatnagar, Amit
    et al.
    Kumar, Eva
    Ji, Min-Kyu
    Jung, Woosik
    Jo, Dongwan
    Kim, Sungwook
    Jeon, Byong-Hun
    Removal of fluoride from water by granular ferric hydroxide (GFH)2008Konferensbidrag (Refereegranskat)
  • 34.
    Bhatnagar, Amit
    et al.
    Environmental Science & Technology Division, CBRI , Roorkee, India / Department of Environmental Engineering (YIEST) , Yonsei University , Wonju, South Korea.
    Kumar, Eva
    Department of Environmental Engineering (YIEST) , Yonsei University , Wonju, South Korea.
    Minocha, A.K.
    Jeon, B.H.
    Song, H.
    Seo, Y.C.
    Removal of anionic dyes from water using Citrus limonum (lemon) peel:  Equilibrium studies and kinetic modeling2009Ingår i: Separation science and technology (Print), ISSN 0149-6395, E-ISSN 1520-5754, Vol. 44, s. 316-334Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The present study was undertaken to evaluate the adsorption potential of Citrus limonum (lemon) peel as an adsorbent for the removal of two anionic dyes, Methyl orange (MO) and Congo red (CR) from aqueous solutions. The adsorption was studied as a function of contact time, initial concentration, and temperature by batch method. The adsorption capacities of lemon peel adsorbent for dyes were found 50.3 and 34.5 mg/g for MO and CR, respectively. The equilibrium adsorption data was well described by the Langmuir model. Three simplified kinetic models viz. pseudo-first-order, pseudo-second-order, and Weber and Morris intraparticle diffusion model were tested to describe the adsorption process. Kinetic parameters, rate constants, equilibrium sorption capacities, and related correlation coefficients for each kinetic model were determined. It was found that the present system of dyes adsorption on lemon peel adsorbent could be described more favorably by the pseudo-first-order kinetic model. The results of the present study reveal that lemon peel adsorbent can be fruitfully utilized as an inexpensive adsorbent for dyes removal from effluents.

  • 35.
    Bhatnagar, Amit
    et al.
    LSRE—Laboratory of Separation and Reaction Engineering, Departamento de Engenharia Química, Faculdade de Engenharia da Universidade do Porto (FEUP), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
    Kumar, Eva
    LSRE—Laboratory of Separation and Reaction Engineering, Departamento de Engenharia Química, Faculdade de Engenharia da Universidade do Porto (FEUP), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
    Sillanpää, Mika
    Faculty of Technology, Lappeenranta University of Technology, Patteristonkatu 1, FI-50100, Mikkeli, Finland.
    Fluoride removal from water by adsorption: A review2011Ingår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 171, nr 3, s. 811-840Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fluoride contamination in drinking water due to natural and anthropogenic activities has been recognized as one of the major problems worldwide imposing a serious threat to human health. Among several treatment technologies applied for fluoride removal, adsorption process has been explored widely and offers satisfactory results especially with mineral-based and/or surface modified adsorbents. In this review, an extensive list of various adsorbents from literature has been compiled and their adsorption capacities under various conditions (pH, initial fluoride concentration, temperature, contact time, adsorbent surface charge, etc.) for fluoride removal as available in the literature are presented along with highlighting and discussing the key advancement on the preparation of novel adsorbents tested so far for fluoride removal. It is evident from the literature survey that various adsorbents have shown good potential for the removal of fluoride. However, still there is a need to find out the practical utility of such developed adsorbents on a commercial scale, leading to the improvement of pollution control.

  • 36.
    Bhatnagar, Amit
    et al.
    FEUP, Dept Engn Quim, LSRE, P-4200465 Oporto, Portugal & Tech Univ Hamburg, Inst Environm Technol & Energy Econ, D-21073 Hamburg, Germany .
    Kumar, Eva
    FEUP, Dept Engn Quim.
    Sillanpää, Mika
    Univ Eastern Finland.
    Nitrate removal from water by nano-alumina: Characterization and sorption studies2010Ingår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 163, nr 3, s. 317-323Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The present study was conducted to evaluate the feasibility of nano-alumina for nitrate removal from aqueous solutions. The nature and morphology of sorbent was characterized by XRD, FTIR, BET and SEM analysis. Batch adsorption studies were performed as a function of contact time, initial nitrate concentration, temperature, pH and influence of other interfering anions. Nitrate sorption kinetics was well fitted by pseudo-second-order kinetic model. The maximum sorption capacity of nano-alumina for nitrate removal was found to be ca. 4.0 mg g(-1) at 25 +/- 2 degrees C. Maximum nitrate removal occurred at equilibrium pH ca. 4.4. The nitrate sorption has been well explained using Langmuir isotherm model. Results from this study demonstrated the potential utility of nano-alumina for nitrate removal from water.

  • 37.
    Bhatnagar, Amit
    et al.
    Environmental Science & Technology Division, Central Building Research Institute (CBRI), Roorkee 247667, India / Department of Environmental Engineering (YIEST), Yonsei University, Wonju 220-710, South Korea.
    Minocha, A.K.
    Adsorptive removal  of 2,4- dichlorophenol from water utilizing Punica granatum peel waste and stabilization with cement2009Ingår i: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 168, s. 111-117Artikel i tidskrift (Refereegranskat)
  • 38.
    Bhatnagar, Amit
    et al.
    Environmental Science and Technology Division, CBRI, Roorkee, India,Institute of Environmental Technology and Energy Economics, Hamburg University of Technology (TUHH), 21073 Hamburg Harburg, Germany .
    Minocha, A.K.
    Assessment of the biosorption characteristics of lychee ( Litchi chinensis) peel waste for the removal of Acid Blue 25 dye from water2010Ingår i: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 31, s. 97-105Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The aim of this study was to examine the adsorption potential of lychee (Litchi chinensis) peel waste for the removal of Acid Blue 25 dye from aqueous solutions. The adsorption was studied as a function of contact time, initial dye concentration and temperature by batch method. Equilibrium sorption isotherms showed that the lychee peel adsorbent possessed a high affinity and sorption capacity for Acid Blue 25, with a monolayer sorption capacity of ca. 200 mg g-1. The equilibrium adsorption data were well described by the Langmuir model. Kinetic studies revealed that the present system of dye adsorption on lychee peel adsorbent could be described more favourably by the pseudo-second-order kinetic model. The thermodynamic parameters, namely free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) changes, were determined for the process. The results of the present study suggest that lychee peel waste can be used beneficially as an adsorbent in treating industrial effluents containing dyes.

  • 39.
    Bhatnagar, Amit
    et al.
    Cent Bldg Res Inst, Environm Sci & Technol Div, Roorkee 247667, Uttar Pradesh, India & Hamburg Univ Technol TUHH, Inst Environm Technol & Energy Econ, D-21073 Hamburg, Germany.
    Minocha, A.K.
    Biosorption optimization of nickel removal from water using Punica granatum peel waste2010Ingår i: Colloids and Surfaces B: Biointerfaces, ISSN 0927-7765, E-ISSN 1873-4367, Vol. 76, nr 2, s. 544-548Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The present Study was undertaken to evaluate the feasibility of Punica granatum (pomegranate) peel waste for the removal of nickel from water. Batch experiments were performed to study the biosorption of nickel on prepared pomegranate peel adsorbent. The sorption process was well explained with pseudo-second-order kinetic model. The maximum sorption capacity of pomegranate peel adsorbent for nickel removal was ca. 52 mg g(-1). The sorption has been found to be endothermic and data conform to the Langmuir model. The Gibbs free energy was determined to be negative, indicating the spontaneous nature of the sorption process. The results of the present study suggest that pomegranate peel waste can be used beneficially for nickel removal from aqueous solution.

  • 40. Bhatnagar, Amit
    et al.
    Minocha, A.K.
    Conventional and non- conventional adsorbents for removal of pollutants from water – A Review2006Ingår i: Indian Journal of Chemical Technology, ISSN 0971-457X, E-ISSN 0975-0991, Vol. 13, s. 203-217Artikel i tidskrift (Refereegranskat)
  • 41.
    Bhatnagar, Amit
    et al.
    Environmental Science and Technology Division, Central Building Research Institute (CBRI), Roorkee 247667, India.
    Minocha, A.K.
    Utilization of industrial waste for cadmium removal from water and immobilization in cement2009Ingår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 150, s. 145-151Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The present study investigates the adsorption potential of metal sludge (a waste product of the electroplating industry) for the removal of cadmium from water. The adsorption capacity of the waste sludge for cadmium was ca. 40 mg g−1 at 25 °C. The adsorption was studied as a function of contact time, concentration and temperature by batch experiments. The adsorption has been found to be endothermic and data conform to the Langmuir model. The analysis of kinetic data indicates that the present adsorption system followed pseudo-first-order kinetics. After the adsorption studies, the metal-laden sludge adsorbent was immobilized in cement for its ultimate disposal. Physical properties such as initial and final setting time and the compressive strength of cement-stabilized wastes were tested to investigate the effect of the metal-laden sludge. The results of the present study clearly reveal that waste metal sludge can be used beneficially in treating industrial effluents containing cadmium and safely disposed of by immobilizing into cement. The proposed technology provides a two-fold advantage of wastewater treatment and solid waste management.

  • 42.
    Bhatnagar, Amit
    et al.
    Environmental Science & Technology (E S T) Division , Central Building Research Institute (CBRI) , Roorkee, India / Department of Environmental Engineering , Yonsei University , Wonju Kangwon‐Do, South Korea.
    Minocha, A.K.
    Jeon, B.H.
    Park, J.M
    Adsorptive removal of cobalt from aqueous solutions by utilizing industrial waste and its cement fixation2007Ingår i: Separation science and technology (Print), ISSN 0149-6395, E-ISSN 1520-5754, Vol. 42, nr 6, s. 1255-1266Artikel i tidskrift (Refereegranskat)
  • 43. Bhatnagar, Amit
    et al.
    Minocha, A.K.
    Jeon, B.H.
    Park, J.M.
    Lee, G.
    Adsorption of orange G dye on  paper mill sludge: Equilibrium and kinetic modeling2007Ingår i: Fresenius Environmental Bulletin, ISSN 1018-4619, E-ISSN 1610-2304, Vol. 16, nr 9, s. 1049-1055Artikel i tidskrift (Refereegranskat)
  • 44. Bhatnagar, Amit
    et al.
    Minocha, A.K.
    Kim, S.H.
    Jeon, B.H.
    Removal of some metal ions from water by battery industry waste and its cement fixation2007Ingår i: Fresenius Environmental Bulletin, ISSN 1018-4619, E-ISSN 1610-2304, Vol. 16, nr 1, s. 99-103Artikel i tidskrift (Refereegranskat)
  • 45.
    Bhatnagar, Amit
    et al.
    Environmental Science & Technology Division, Central Building Research Institute (CBRI) , Roorkee, India.
    Minocha, A.K.
    Environmental Science & Technology Division, Central Building Research Institute (CBRI) , Roorkee, India.
    Kumar, E.
    Department of Environmental Engineering , Yonsei University , Wonju, Gangwon-do, South Korea.
    Sillanpää, M.
    Laboratory of Applied Environmental Chemistry (LAEC), Department of Environmental Sciences , University of Kuopio , Mikkeli, Finland.
    Jeon, BH
    Department of Environmental Engineering , Yonsei University , Wonju, Gangwon-do, South Korea.
    Removal of phenolic pollutants from water utilizing Mangifera indica (Mango) seed waste and cement fixation2009Ingår i: Separation science and technology (Print), ISSN 0149-6395, E-ISSN 1520-5754, Vol. 44, nr 13, s. 3150-3169Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A process for the removal of two chlorophenols (2-chlorophenol and 2,4-dichlorophenol) from water using surface modified mango seed waste by adsorption process followed by cement fixation of the phenols-laden adsorbent is investigated. The two main objectives of this study were to develop efficient adsorbent utilizing mango seed waste by physiochemical activation and to an environmentally-friendly disposal of phenols-laden adsorbent into cement by a fixation process. The results of the present study reveal that the modified mango seed adsorbent showed an efficient adsorption potential for chlorophenols removal from water. The maximum adsorption potential of modified mango seed adsorbent for 2-chlorophenol and 2,4-dichlorophenol was 40.6 and 72.3 mg g−1, respectively at 25°C. Adsorption kinetic data of chlorophenols adsorption on mango seed adsorbent could be described more favorably by a pseudo-second-order kinetic model. After the adsorption studies, the phenol-laden adsorbent was immobilized in cement for its ultimate disposal. Leachates from the fixed phenols-laden adsorbent exhibit phenols concentrations lower than the drinking water standards. Results from this study suggest the potential utility of agricultural wastes as one of the most promising activated carbon precursors for phenols removal from water and wastewater and the safe disposal of phenol-laden adsorbent into cement by fixation process.

  • 46. Bhatnagar, Amit
    et al.
    Minocha, A.K.
    Pudasainee, D.
    Chung, H.K.
    Kim, S.H.
    Kim, HS
    Lee, G.H.
    Min, B.
    Jeon, B.H.
    Vanadium removal from water by waste metal sludge and cement immobilization2008Ingår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 144, s. 197-204Artikel i tidskrift (Refereegranskat)
  • 47.
    Bhatnagar, Amit
    et al.
    Univ Kuopio, Dept Environm Sci, Lab Appl Environm Chem, Mikkeli, Finland & Cent Bldg Res Inst, Environm Sci & Technol Div, Roorkee 247667, Uttar Pradesh, India.
    Minocha, A.K.
    Sillanpää, Mika
    Adsorptive removal of cobalt from aqueous solution by utilizing lemon peel as biosorbent2010Ingår i: Biochemical engineering journal, ISSN 1369-703X, E-ISSN 1873-295X, Vol. 48, nr 2, s. 181-186Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The present study was undertaken to evaluate the feasibility of lemon peel waste for the removal of cobalt ions from aqueous solutions. Batch experiments were performed to study the adsorption of cobalt on lemon peel adsorbent. The maximum adsorption capacity of lemon peel adsorbent for cobalt removal was ca. 22 mg g(-1). Three simplified kinetic models viz. pseudo-first-order, pseudo-second-order, and Weber and Morris intraparticle diffusion models were tested to describe the adsorption process. Kinetic parameters, rate constants, equilibrium sorption capacities, and related correlation coefficients for kinetic models were determined. It was found that the present system of cobalt adsorption on lemon peel adsorbent could be described more favorably by the pseudo-second-order kinetic model. The adsorption process has been found to be exothermic. The results of the present study suggest that lemon peel waste can be used beneficially in treating industrial effluents containing heavy metal ions.

  • 48.
    Bhatnagar, Amit
    et al.
    Department of Chemistry, I.I.T. Roorkee, Roorkee, 247667, India.
    Mukul, M.K.
    Jain, A.K.
    Removal of congo red dye from water using carbon slurry waste2005Ingår i: Environmental Chemistry Letters, ISSN 1610-3653, E-ISSN 1610-3661, Vol. 25, s. 199-202Artikel i tidskrift (Refereegranskat)
  • 49. Bhatnagar, Amit
    et al.
    Repo, E.
    Warchol, J.K.
    Sillanpää, Mika
    Heavy metals adsorption by novel EDTA-modified chitosan-silica hybrid materials2011Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 358, nr 1, s. 261-267Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Novel adsorbents were synthesized by functionalizing chitosan-silica hybrid materials with (ethylenediaminetetraacetic acid) EDTA ligands. The synthesized adsorbents were found to combine the advantages of both silica gel (high surface area, porosity, rigid structure) and chitosan (surface functionality). The Adsorption potential of hybrid materials was investigated using Co(II), Ni(II), Cd(II), and Pb(II) as target metals by varying experimental conditions such as pH, contact time, and initial metal concentration. The kinetic results revealed that the pore diffusion process played a key role in adsorption kinetics, which might be attributed to the porous structure of synthesized adsorbents. The obtained maximum adsorption capacities of the hybrid materials for the metal ions ranged from 0.25 to 0.63 mmol/g under the studied experimental conditions. The adsorbent with the highest chitosan content showed the best adsorption efficiency. Bi-Langmuir and Sips isotherm model fitting to experimental data suggested the surface heterogeneity of the prepared adsorbents. In multimetal solutions, the hybrid adsorbents showed the highest affinity toward Pb(II).

  • 50.
    Bhatnagar, Amit
    et al.
    FEUP, Dept Engn Quim, LSRE, P-4200465 Oporto, Portugal .
    Sillanpää, M.
    Sorption studies of bromate removal from water by nano-Al2O32012Ingår i: Separation science and technology (Print), ISSN 0149-6395, E-ISSN 1520-5754, Vol. 47, nr 1, s. 89-95Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The feasibility of nano-Al2O3 for bromate removal from aqueous solution was assessed in the present study. Batch sorption experiments were performed to examine the influence of various experimental parameters such as contact time, initial bromate concentration, temperature, and pH on the sorption of bromate on nano-Al2O3. Kinetic data revealed that the uptake rate of bromate was rapid in the beginning and 50% adsorption was completed within 10 min and equilibrium was achieved within 120 min. Pseudo-second-order kinetic model was fitted well with the kinetics of the sorption process. The sorption potential of nano-Al2O3 for bromate removal was similar to 6.0mg g(-)1. The adsorption was found to be an endothermic process and data conform to the Langmuir model.

12 1 - 50 av 95
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