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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
environmental science
Removal of fluoride ions from aqueous solution at low pH using schwertmannite
Journal of Hazardous Materials, Volume 152, No. 2, Year 2008
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Description
Wastewater containing fluoride requires polishing after precipitation/coagulation treatment in order to meet stringent environmental legislation. Accordingly, adsorption characteristics of fluoride onto schwertmannite adsorbent were studied in a batch system with respect to changes in initial concentration of fluoride, equilibrium pH of sample solution, adsorbent dosage and co-existing ions. Equilibrium adsorption data were obtained at 295.6, 303 and 313 K, and are interpreted in terms of two-site Langmuir, Freundlich, Langmuir-Freundlich, Redlich-Peterson, Tóth and Dubinin-Radushkevitch isotherm models. The experimental and equilibrium modeling results revealed that the capacity of schwertmannite for fluoride is high but insensitive to changes in solution temperature. An increase in equilibrium pH of sample solution reduced significantly the fluoride removal efficiency. In binary component systems, inner-sphere complex forming species had negative effects on fluoride adsorption while outer-sphere complex forming species improved slightly the fluoride removal efficiency. The schwertmannite adsorbent was regenerable and had the ability to lower the fluoride concentration to acceptable levels. © 2007 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Eskandarpour, Akbar
Japan, Nagoya
Nagoya University
Onyango, Maurice Stephen
South Africa, Stellenbosch
Stellenbosch University
Ochieng, Aoyi
South Africa, Johannesburg
School of Chemical and Metallurgical Engineering
Asai, Shigeo
Japan, Nagoya
Nagoya University
Statistics
Citations: 186
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.jhazmat.2007.07.020
ISSN:
03043894