期刊
CHEMICAL ENGINEERING JOURNAL
卷 158, 期 2, 页码 315-324出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.01.008
关键词
Fluoride removal; Binary oxide; Chitosan; Adsorption isotherm; Thermodynamic parameters
资金
- Council of Scientific and Industrial Research (CSIR)
- UNICEF Bhopal, India
In the present study, the performance of Ti-Al binary metal oxide supported beads using chitosan template was studied for fluoride removal from drinking water. The adsorbent was synthesized by precipitation method and characterized using FTIR, SEM, XRD and BET. The higher surface area of the synthesized adsorbent 323.83 m(2)/g results in a much higher fluoride removal capacity Q(max) = 2.22 mg g(-1) as compared to bare chitosan. Pore size of beads is 42.97 angstrom, suggesting mesoporous nature of adsorbent. Material works very effectively at all pH except at pH greater than 9. The presence of carbonate and bicarbonate ions showed significant decline in the fluoride removal capacity of adsorbent. The experimental data fitted well to Langmuir adsorption model. The kinetic studies indicate that the system follows the pseudo-second-order and intra-particle diffusion model. Thermodynamic study reveals that the fluoride adsorption by Ti-Al binary metal oxide supported beads is an exothermic and spontaneous process. Alum appears to be the promising regeneration media showing 80% regeneration. The applicability of the adsorbent for fluoride removal was tested in field water collected from the Dhar district in Madhaya Pradesh, India. (C) 2010 Published by Elsevier B.V.
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