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Fluoride removal from water by adsorption: A review
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. (ESEG)ORCID iD: 0000-0002-3565-9943
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.
Faculty of Technology, Lappeenranta University of Technology, Patteristonkatu 1, FI-50100, Mikkeli, Finland.
2011 (English)In: Chemical Engineering Journal, ISSN 1385-8947, Vol. 171, no 3, 811-840 p.Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 171, no 3, 811-840 p.
National Category
Earth and Related Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-21006DOI: 10.1016/j.cej.2011.05.028ISI: 000293664600012OAI: oai:DiVA.org:lnu-21006DiVA: diva2:543124
Conference
Symposium on Post-Combustion Carbon Dioxide Capture, Tufts University's European Center in Talloires, France, July 11–13, 2010
Available from: 2012-08-06 Created: 2012-08-06 Last updated: 2014-05-09Bibliographically 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

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