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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 9, 2015, pp. 2809-2818
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Bioline Code: st15263
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 9, 2015, pp. 2809-2818
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Enhanced fluoride removal by hydroxyapatite-modified activated alumina
Tomar, G.; Thareja, A. & Sarkar, S.
Abstract
Fluoride in drinking water is beneficial at low
concentrations but is considered harmful for the human
health when present at concentrations exceeding 1.5 mg/L.
Prevalence of high concentration of fluoride in drinking
water, combined with the nonavailability of alternate viable
sources, makes the treatment of the contaminated water
an essential task. In this study, we report the synthesis and
characterization of a hybrid adsorbent; hydroxyapatitemodified
activated alumina (HMAA) prepared by dispersing
nanoparticles of hydroxyapatite inside activated alumina
granules. The composite adsorbent provided a
synergy toward fluoride removal from contaminated
drinking water. The hybrid adsorbent possesses a maximum
adsorption capacity of 14.4 mg F/g which is at least
five times higher than the virgin-activated alumina, which
has been used extensively for fluoride removal. HMAA
was regenerated using six bed volumes of a solution containing
commonly available innocuous chemicals. The
adsorbent was subjected to multiple numbers of operating
cycles within a column, each cycle consisting of one
adsorption run followed by regeneration.
Keywords
Activated alumina; Hydroxyapatite-modified activated alumina; Fluoride, defluoridation; Nanoparticles, adsorption; Column run; Regeneration
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