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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5448
Title: Fluoride removal by a hybrid fluoride-selective adsorbent
Authors: Tomar G.
Thareja A.
Sarkar S.
Published in: Water Science and Technology: Water Supply
Abstract: High concentrations of fluoride in groundwater have become a global environmental challenge. Out of the various methods developed for effective removal of fluoride adsorption using activated alumina (AA) is popular as it has a low initial cost. AA offers excellent chemical and mechanical stability, selectivity for fluoride, favorable hydraulic properties, regenerability but offers lower adsorption capacity as there is reduction in material and capacity with an increased presence of aluminum. Hydroxyapatite nanoparticles have been found to possess high adsorption capacity for fluoride but they lack mechanical stability and favorable hydraulic properties. In this study, we synthesized a hybrid adsorbent, modified activated alumina, prepared by dispersing nanoparticles of hydroxyapatite inside AA granules. The hybrid adsorbent possesses a maximum adsorption capacity of 14.4 mg F/g which is at least five times higher than that of the virgin AA which has been used extensively for fluoride removal. A column run carried out on the hybrid adsorbent with a synthetic solution containing 3 mg/L fluoride lasted for 450 bed volumes before a breakthrough of 1.5 mg/L was observed. The exhausted adsorbent could be fully regenerated in a column within six bed volumes using commonly available innocuous chemicals. The study will contribute to the field of effective removal of fluoride from contaminated drinking water. ¬© IWA Publishing 2014.
Citation: Water Science and Technology: Water Supply(2014), 14(6): 1133-1141
URI: https://doi.org/10.2166/ws.2014.072
http://repository.iitr.ac.in/handle/123456789/5448
Issue Date: 2014
Publisher: IWA Publishing
Keywords: Activated alumina
Adsorption
Defluoridation
Hybrid adsorbent
Hydroxyapatite
Nanoparticles
ISSN: 16069749
Author Scopus IDs: 57214610284
56480608000
57201440577
Author Affiliations: Tomar, G., Thapar University, Punjab, India
Thareja, A., Indian Institute of Technology Roorkee, Uttarakhand, India
Sarkar, S., Indian Institute of Technology Roorkee, Uttarakhand, India
Corresponding Author: Sarkar, S.; Indian Institute of Technology RoorkeeIndia
Appears in Collections:Journal Publications [CE]

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