lnu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Nitrate removal from water by nano-alumina: Characterization and sorption studies
FEUP, Dept Engn Quim, LSRE, P-4200465 Oporto, Portugal & Tech Univ Hamburg, Inst Environm Technol & Energy Econ, D-21073 Hamburg, Germany .ORCID iD: 0000-0002-3565-9943
FEUP, Dept Engn Quim.
Univ Eastern Finland.
2010 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 163, no 3, 317-323 p.Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Elsevier, 2010. Vol. 163, no 3, 317-323 p.
National Category
Earth and Related Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-21070DOI: 10.1016/j.cej.2010.08.008ISI: 000283449400019OAI: oai:DiVA.org:lnu-21070DiVA: diva2:543647
Available from: 2012-08-09 Created: 2012-08-09 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Removal of Inorganic Anionic Pollutants from Water using Adsorption Technology
Open this publication in new window or tab >>Removal of Inorganic Anionic Pollutants from Water using Adsorption Technology
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the era of urbanization, industrialization and population growth, groundwater and drinking water sources are getting adversely polluted due to the addition of different toxic contaminants including inorganic anionic pollutants. The inorganic anions are of serious concern due to their adverse health effects on humans, even when present at very low concentrations in water. Adsorption process is an attractive method for the removal of anions as compared to other water treatment technologies in terms of cost, simplicity of design and operation. In this study, granular ferric hydroxide (GFH) and nano-Al2O3 were tested for the removal of fluoride, perchlorate and nitrate anions from aqueous solutions. Different experimental parameters (viz. pH, agitation time, adsorbate concentration, temperature, competing anions) have been studied to optimize the adsorption process. The maximum adsorption capacity of 7.0 mg g-1 (at pH 6.0-7.0) and 20.0 mg g-1 (at pH 6.0-6.5) for fluoride and perchlorate, respectively was achieved using GFH at 25 oC. Adsorption kinetics of fluoride by GFH was favorably explained with pseudo-first-order, while perchlorate adsorption kinetics followed pseudo-second-order model. The Langmuir model explained the adsorption isotherms of fluoride and perchlorate by GFH. The Raman spectroscopy results revealed that perchlorate was adsorbed through electrostatic attraction between perchlorate and positively charged GFH surface sites. The adsorption efficiencies achieved by nano-Al2O3 for nitrate and fluoride were 4.0 mg g-1 (at pH ~4.4) and 14.0 mg g-1 (at pH ~6.15), respectively at 25 oC. Kinetics and isotherms of fluoride and nitrate by nano-Al2O3 were well-explained by pseudo-second-order model and Langmuir isotherm model, respectively. The FTIR and EDX results reveal that aluminum-fluoro complexes are formed due to the interaction between fluoride and nano-Al2O3 moieties. In all the cases, the most influencing anions were the ones that compete for similar binding sites on the adsorbent surface. Results from this study will be helpful in demonstrating potential utility of the tested adsorbents for the removal of different anions from water and provide an insight into the adsorbent-adsorbate (anions) interactions in the aqueous media.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2013
Series
Linnaeus University Dissertations, 142/2013
Keyword
Water treatment, adsorption, inorganic anionic pollutants, granular ferric hydroxide (GFH), nano-alumina, adsorption isotherms, adsorption kinetics, modeling.
National Category
Natural Sciences
Research subject
Natural Science, Environmental Science; Environmental Science, Environmental technology
Identifiers
urn:nbn:se:lnu:diva-27657 (URN)978-91-87427-39-8 (ISBN)
Public defence
2013-08-29, N2007, Smålandsgatan 26E, Kalmar, 09:30 (English)
Opponent
Supervisors
Available from: 2013-07-31 Created: 2013-07-25 Last updated: 2013-07-31Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Authority records BETA

Bhatnagar, Amit

Search in DiVA

By author/editor
Bhatnagar, Amit
In the same journal
Chemical Engineering Journal
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 107 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf