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Defluoridation from aqueous solutions by granular ferric hydroxide (GFH)
Yonsei Univ, Dept Environm Engn, Wonju 220710, Gangwon Do, South Korea.
Yonsei Univ, Dept Environm Engn, Wonju 220710, Gangwon Do, South Korea.ORCID iD: 0000-0002-3565-9943
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2009 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 43, no 2, 490-498 p.Article in journal (Refereed) Published
Abstract [en]

This research was undertaken to evaluate the feasibility of granular ferric hydroxide (GFH) for fluoride removal from aqueous solutions, Batch experiments were performed to study the influence of various experimental parameters such as contact time (1 min-24 h), initial fluoride concentration (1-100 mg L(-1)), temperature (10 and 2S degrees C), pH (3-12) and the presence of competing anions on the adsorption of fluoride on GFH. Kinetic data revealed that the uptake rate of fluoride was rapid in the beginning and 95% adsorption was completed within 10 min and equilibrium was achieved within 60 min. The sorption process was well explained with pseudo-first-order and pore diffusion models. The maximum adsorption capacity of GFH for fluoride removal was 7.0 mg g(-1). The adsorption was found to be an endothermic process and data conform to Langmuir model. The optimum fluoride removal was observed between pH ranges of 4-8. The fluoride adsorption was decreased in the presence of phosphate followed by carbonate and sulphate. Results from this study demonstrated potential utility of GFH that could be developed into a viable technology for fluoride removal from drinking water.

Place, publisher, year, edition, pages
2009. Vol. 43, no 2, 490-498 p.
National Category
Engineering and Technology Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-27671DOI: 10.1016/j.watres.2008.10.031ISI: 000263595500026OAI: oai:DiVA.org:lnu-27671DiVA: diva2:638104
Available from: 2013-07-26 Created: 2013-07-26 Last updated: 2014-03-27Bibliographically 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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