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Daneshvar, E., Kousha, M., Sohrabi, M. S., Panahbehagh, B., Bhatnagar, A., Younesi, H. & Sternberg, S. P. K. (2015). Application of response surface methodology for the biosorption of Acid Blue 25 dye using raw and HCl-treated macroalgae. Desalination and Water Treatment, 53(6), 1710-1723
Open this publication in new window or tab >>Application of response surface methodology for the biosorption of Acid Blue 25 dye using raw and HCl-treated macroalgae
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2015 (English)In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 53, no 6, p. 1710-1723Article in journal (Refereed) Published
Abstract [en]

The present study was conducted to optimize the various experimental conditions, such as biomass loading, initial C.I. Acid Blue 25 (AB25) dye concentration, and initial solution pH for biosorption of dye on raw and HCl-treated brown alga, Padina australis and red alga, Jania adhaerens. Biosorption process was optimized in a batch system under Box-Behnken design. Second-order polynomial equation was successfully used to describe the effects of studied variables on response. The quadratic models exhibited higher R-2 values, significant p-values, and insignificant lack-of-fit p-values showed high adequacy for predicting the response. Chemically modified red alga exhibited better AB25 dye biosorption capacity as compared to modified brown alga. Maximum dye removal efficiencies of 77.34, 71.28, 50.56, and 85.19% for P. australis, HCl-treated P. australis, J. adhaerens, and HCl-treated J. adhaerens, respectively, were obtained at optimal conditions. The surface modification on tested algal biomass was found to be strongly dependent on their cell wall constituents.

Keywords
Acid Blue 25 dye, Response surface methodology, Macroalgae, Biosorption, Chemical modification
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-40894 (URN)10.1080/19443994.2013.855666 (DOI)000349390800005 ()2-s2.0-84922849127 (Scopus ID)
Available from: 2015-03-17 Created: 2015-03-17 Last updated: 2017-12-04Bibliographically approved
Fathollahzadeh, H., Kaczala, F., Bhatnagar, A. & Hogland, W. (2015). Significance of environmental dredging on metal mobility from contaminated sediments in the Oskarshamn Harbor, Sweden. Chemosphere, 119, 445-451
Open this publication in new window or tab >>Significance of environmental dredging on metal mobility from contaminated sediments in the Oskarshamn Harbor, Sweden
2015 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 119, p. 445-451Article in journal (Refereed) Published
Abstract [en]

Metals are often seen as immobile in bottom sediments as long as these environmental sinks remain undisturbed. The aim of this paper was to evaluate the potential metal mobility due to resuspension under pseudo-dredging conditions of contaminated sediments in the Oskarshamn Harbor that are likely to be dredged as part of a remediation program established in Sweden. To address this concern, mixtures of water slurries were sampled from pore, leaching, and surface water over a period of nearly 36 d, and the major ions and trace metal concentrations determined. The results of this study pointed out the potential mobility and toxicity of metals posed by temporary changes during dredging operations, and highlighted the potential release of Cu, Pb, Zn, Mn, and Ni to the environment. Among the toxic metals, regarding pre and post dredging, Cu and Pb significantly demonstrated to be in ionic form, apparently because of dissolution of Fe-Mn oxy/hydroxides and decomposition of organic matter. (C) 2014 Elsevier Ltd. All rights reserved.

Keywords
Dredging, Contaminated sediments, Baltic Sea, Pore water, Leaching water, Geochemical modeling
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-40903 (URN)10.1016/j.chemosphere.2014.07.008 (DOI)000347739600060 ()25084063 (PubMedID)2-s2.0-84919725065 (Scopus ID)
Available from: 2015-03-17 Created: 2015-03-17 Last updated: 2017-12-04Bibliographically approved
Ambashta, R. D., Bhatnagar, A. & Sillanpää, M. E. T. (2015). Supported iron-based catalysts under influence of static magnetic field for the removal of TBP and EDTA. Desalination and Water Treatment, 54(10), 2700-2709
Open this publication in new window or tab >>Supported iron-based catalysts under influence of static magnetic field for the removal of TBP and EDTA
2015 (English)In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 54, no 10, p. 2700-2709Article in journal (Refereed) Published
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.

Keywords
Degradation, EDTA, Magnetic nanocatalyst, TBP, SQUID magnetization
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-46069 (URN)10.1080/19443994.2014.903206 (DOI)000353715700005 ()2-s2.0-84928767752 (Scopus ID)
Available from: 2015-09-04 Created: 2015-09-04 Last updated: 2017-12-04Bibliographically approved
Svensson, H., Marques, M., Svensson, B.-M., Mårtensson, L., Bhatnagar, A. & Hogland, W. (2015). Treatment of wood leachate with high polyphenols content by peat and carbon-containing fly ash filters. Desalination and Water Treatment, 53(8), 2041-2048
Open this publication in new window or tab >>Treatment of wood leachate with high polyphenols content by peat and carbon-containing fly ash filters
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2015 (English)In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 53, no 8, p. 2041-2048Article in journal (Refereed) Published
Abstract [en]

In the present study, two combinations of filter materials in filter/columns were examined for removal of total organic carbon (TOC) and polyphenols (PP) found in storm water runoff from wood storage areas in a wooden floor industry. One filter/column was packed with peat mixed with carbon-containing fly ash, while another filter/column contained only peat (without ash). The mixture of peat and ash has shown faster and higher removal capacity for TOC and faster removal with the same final removal capacity for PP (in grams of pollutant per kg of sorbent) at the saturation point. The superiority observed for the peat and ash filter is presumably due to the unique characteristics of peat and ash, which enhanced the treatment efficiency when used together in a mixture. Based on the observed results, filters formed by peat and carbon-containing ashes proved to be a potentially low-cost option for the treatment of storm water generated at storage areas of wood materials such as logs, sawdust and wood chips.

National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-31031 (URN)10.1080/19443994.2013.860883 (DOI)000349000700003 ()2-s2.0-84922771627 (Scopus ID)
Note

Correction: Svensson, H, Marques, M, Svensson, BM, Mårtensson, L, Bhatnagar, A,Hogland,W. 2015. Treatment of wood leachate with high polyphenols content by peat and carbon-containing fly ash filters (vol 53, pg 2041, 2015). Desalination and Water Treatment 54(1):V

Available from: 2013-12-07 Created: 2013-12-07 Last updated: 2017-12-06Bibliographically approved
Hokkanen, S., Repo, E., Bhatnagar, A., Tang, W. Z. & Sillanpaa, M. (2014). Adsorption of hydrogen sulphide from aqueous solutions using modified nano/micro fibrillated cellulose. Environmental technology, 35(18), 2334-2346
Open this publication in new window or tab >>Adsorption of hydrogen sulphide from aqueous solutions using modified nano/micro fibrillated cellulose
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2014 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 35, no 18, p. 2334-2346Article in journal (Refereed) Published
Abstract [en]

In the present study, microfibrillated cellulose (MFC) was modified by aminopropyltriethoxysilane (APS), hydroxy-carbonated apatite (HAP), or epoxy in order to produce novel nanostructured adsorbents for the removal of hydrogen sulphide (H2S) from the aqueous solutions. Structural properties of the modified MFC materials were examined using a scanning electron microscope, Fourier transform infrared spectroscopy and acid/base titration. These methods were used to verify the presence of nanostructures on the adsorbents surfaces as well as functionalities suitable for H2S adsorption. Adsorption of H2S by prepared adsorbents was investigated in batch mode under different experimental conditions, i.e. varying pH and H2S concentrations. H2S uptake was found to be 103.95, 13.38 and 12.73mg/g by APS/MFC, HAP/MFC and epoxy/MFC, respectively from 80mg/L H2S solution. The equilibrium data were best described by the Langmuir isotherm for HAP/MFC and APS/MFC and the Sips isotherm for epoxy/MFC.

Keywords
adsorption, hydrogen sulphide, nanocellulose, water treatment, isotherms
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-36084 (URN)10.1080/09593330.2014.903300 (DOI)000336432700009 ()2-s2.0-84901500921 (Scopus ID)
Available from: 2014-07-17 Created: 2014-07-17 Last updated: 2017-12-05Bibliographically approved
Bhatnagar, A. & Sillanpää, M. (2014). Application of Nanoadsorbents in Water Treatment (1ed.). In: Boris I. Kharisov, Oxana V. Kharissova, & H. V. Rasika Dias (Ed.), Nanomaterials for Environmental Protection: (pp. 237-247). John Wiley & Sons
Open this publication in new window or tab >>Application of Nanoadsorbents in Water Treatment
2014 (English)In: Nanomaterials for Environmental Protection / [ed] Boris I. Kharisov, Oxana V. Kharissova, & H. V. Rasika Dias, John Wiley & Sons, 2014, 1, p. 237-247Chapter in book (Other academic)
Abstract [en]

Water treatment using the adsorption process has been found to be one of the most widely used methods, and several wastewater treatment plants around the world are operating on the principle of adsorption. Numerous adsorbents, for example, activated carbon, silica gel, zeolites, low-cost adsorbents from agro-industrial wastes, biosorbents, mineral-based adsorbents, and layered-double hydroxides, have been examined for their potential in the removal (adsorption) of diverse types of aquatic pollutants. In recent years, nanotechnology has emerged as one of the attractive technologies for water treatment, and various nanoadsorbents have been explored for water treatment applications. This chapter briefly summarizes the progress, advances, and applications of nanoadsorbents for water remediation. A compilation of various nanoadsorbents as reported in the literature has been presented, and their main findings related to water treatment applications are discussed. The chapter concludes with a discussion on the future perspectives in this field.

Place, publisher, year, edition, pages
John Wiley & Sons, 2014 Edition: 1
Keywords
Carbon nanotubes, Nanoadsorbents, Nanoparticles, Nanotechnology, Water treatment
National Category
Nano Technology
Research subject
Technology (byts ev till Engineering)
Identifiers
urn:nbn:se:lnu:diva-54885 (URN)10.1002/9781118845530.ch15 (DOI)2-s2.0-84927578103 (Scopus ID)9781118496978 (ISBN)9781118845530 (ISBN)
Available from: 2016-08-10 Created: 2016-07-22 Last updated: 2016-08-15Bibliographically approved
Pulkka, S., Martikainen, M., Bhatnagar, A. & Sillanpaa, M. (2014). Electrochemical methods for the removal of anionic contaminants from water - A review. Separation and Purification Technology, 132, 252-271
Open this publication in new window or tab >>Electrochemical methods for the removal of anionic contaminants from water - A review
2014 (English)In: Separation and Purification Technology, ISSN 1383-5866, E-ISSN 1873-3794, Vol. 132, p. 252-271Article, review/survey (Refereed) Published
Abstract [en]

Different electrochemical methods such as electrocoagulation, electro-oxidation, and electroreduction have been found effective for the removal of various anionic pollutants from water and wastewater. Electrochemical processes can transform contaminants directly or manipulate the redox condition of the environmental matrix to achieve adaptive condition. This review focuses on the removal of different anions, including cyanide, fluoride, nitrate, nitrite, phosphate, and sulfate, from water by electrocoagulation, electro-oxidation, and electroreduction methods. Optimum treatment conditions for studied anions in each electrochemical method are discussed. An overview of electrochemical methods used for anions removal together with specific applications and experimental results are presented and discussed. It is evident from the literature reviewed that these methods have shown considerable potential for the removal of anionic pollutants from water. However, the most challenging issue in this research area is to find out the practical application of these methods on commercial scale, leading to the improvement of pollution control. (C) 2014 Elsevier B.V. All rights reserved.

Keywords
Electrocoagulation, Electro-oxidation, Electroreduction, Anions removal, Water treatment
National Category
Environmental Sciences
Research subject
Environmental Science, Environmental technology
Identifiers
urn:nbn:se:lnu:diva-36903 (URN)10.1016/j.seppur.2014.05.021 (DOI)000340300600032 ()2-s2.0-84902682917 (Scopus ID)
Available from: 2014-09-12 Created: 2014-09-12 Last updated: 2017-12-05Bibliographically approved
Kumar, E., Bhatnagar, A., Hogland, W., Marques, M. & Sillanpää, M. (2014). Interaction of anionic pollutants with Al-based adsorbents in aqueous media – A review. Chemical Engineering Journal, 241, 443-456
Open this publication in new window or tab >>Interaction of anionic pollutants with Al-based adsorbents in aqueous media – A review
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2014 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 241, p. 443-456Article in journal (Refereed) Published
Abstract [en]

Many anionic pollutants (e.g., fluoride, nitrate and nitrite, bromate, phosphate, arsenate and arsenite, selenate and selenite, perchlorate) have been detected in surface and groundwater in different parts of the world and strict measures are being taken to minimize their concentrations and to control their mobility in aqueous media. Mineral surfaces, in general, have shown enhanced uptake of many anionic pollutants. Various phases of aluminum (Al) oxides, hydroxides and oxyhydroxide are increasingly being employed as adsorbents for the detoxification of water and wastewater contaminated with anionic pollutants. Understanding the structural properties and morphology of adsorbents is important in order to gain knowledge about the governing mechanism behind the adsorption of anions by these adsorbents. The adsorption ability of aluminum oxides, hydroxides and oxyhydroxide depends on several key factors including properties of the adsorbent (surface area, pore size, pHpzc, porosity) and that of the adsorbates. This paper provides an overview of the physical and chemical properties of various aluminum oxides, hydroxides and oxyhydroxides and their application in water and wastewater treatment with the focus on the removal of anionic pollutants. Furthermore, the performance of these minerals and that of the synthetically prepared hybrid adsorbents (containing Al-minerals) for the adsorption of various anions has been reviewed with an emphasis on the behavior of adsorbent-water interface in presence of the anionic pollutants.

National Category
Environmental Engineering
Research subject
Environmental Science, Natural Resources Management
Identifiers
urn:nbn:se:lnu:diva-30746 (URN)10.1016/j.cej.2013.10.065 (DOI)000333720000049 ()2-s2.0-84894271521 (Scopus ID)
Available from: 2013-11-26 Created: 2013-11-26 Last updated: 2017-12-06Bibliographically approved
Kumar, E., Bhatnagar, A., Hogland, W., Marques, M. & Sillanpaa, M. (2014). Interaction of inorganic anions with iron-mineral adsorbents in aqueous media - A review. Advances in Colloid and Interface Science, 203, 11-21
Open this publication in new window or tab >>Interaction of inorganic anions with iron-mineral adsorbents in aqueous media - A review
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2014 (English)In: Advances in Colloid and Interface Science, ISSN 0001-8686, E-ISSN 1873-3727, Vol. 203, p. 11-21Article, review/survey (Refereed) Published
Abstract [en]

A number of inorganic anions (e.g., nitrate, fluoride, bromate, phosphate, and perchlorate) have been reported in alarming concentrations in numerous drinking water sources around the world. Their presence even in very low concentrations may cause serious environmental and health related problems. Due to the presence and significance of iron minerals in the natural aquatic environment and increasing application of iron in water treatment, the knowledge of the structure of iron and iron minerals and their interactions with aquatic pollutants, especially inorganic anions in water are of great importance. Iron minerals have been known since long as potential adsorbents for the removal of inorganic anions from aqueous phase. The chemistry of iron and iron minerals reactions in water is complex. The adsorption ability of iron and iron minerals towards inorganic anions is influenced by several factors such as, surface characteristics of the adsorbent (surface area, density, pore volume, porosity, pore size distribution, pH(pzo) purity), pH of the solution, and ionic strength. Furthermore, the physico-chemical properties of inorganic anions (pore size, ionic radius, bulk diffusion coefficient) also significantly influence the adsorption process. The aim of this paper is to provide an overview of the properties of iron and iron minerals and their reactivity with some important inorganic anionic contaminants present in water. It also summarizes the usage of iron and iron minerals in water treatment technology. (C) 2013 Elsevier B.V. All rights reserved.

Keywords
Adsorption, Inorganic anionic pollutants, Iron minerals, Adsorption mechanism, Review
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-32449 (URN)10.1016/j.cis.2013.10.026 (DOI)000330262200002 ()2-s2.0-84892366860 (Scopus ID)
Available from: 2014-02-24 Created: 2014-02-24 Last updated: 2017-12-05Bibliographically approved
Metsämuuronen, S., Sillanpää, M., Bhatnagar, A. & Mänttäri, M. (2014). Natural organic matter removal from drinking water by membrane technology. Separation and Purification Reviews, 43(1), 1-61
Open this publication in new window or tab >>Natural organic matter removal from drinking water by membrane technology
2014 (English)In: Separation and Purification Reviews, ISSN 1542-2119, Vol. 43, no 1, p. 1-61Article in journal (Refereed) Published
Abstract [en]

Aquatic natural organic matter (NOM) is a heterogeneous mixture of biopolymers and their degradation products that cause harmful by-products during drinking water production. The great variability in NOM composition makes it difficult to completely remove from drinking water by any single technique. The current paper reviews the NOM removal by micro-, ultra- and nanofiltration and by hybrid processes combining membrane techniques with other unit processes: coagulation, adsorption, and oxidation, and by membrane bioreactors.

National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-20985 (URN)10.1080/15422119.2012.712080 (DOI)000320911500001 ()2-s2.0-84880201283 (Scopus ID)
Available from: 2012-08-06 Created: 2012-08-06 Last updated: 2017-03-09Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-3565-9943

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