Enhanced adsorptive removal of fluoride using mesoporous alumina |
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| Authors: | Grace Lee Chao Chen Seung-Tae Yang Wha-Seung Ahn |
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| Affiliation: | 1. Department of Chemistry, Banasthali Vidyapith, Banasthali, 304022 Rajasthan, India;2. School of Biological and Chemical Sciences, Faculty of Science, Technology and Environment, The University of the South Pacific, Private Mail Bag, Suva, Fiji;1. Department of Chemistry, Banasthali Vidyapith, Banasthali 304022, Rajasthan, India;2. School of Biological and Chemical Sciences, Faculty of Science, Technology and Environment, The University of the South Pacific, Private Mail Bag, Suva, Fiji |
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| Abstract: | Two different kinds of mesoporous alumina samples were prepared using aluminum tri-sec-butoxide in the presence of either cetyltrimethylammonium bromide (MA-1) or stearic acid (MA-2) as a structure-directing agent, and tested for adsorptive removal of fluoride in water. Both materials contain a wormhole-like mesopore structure, but exhibited different textural properties: surface area (421 or 650 m2/g) and pore volume (0.96 or 0.59 cm3/g). These mesoporous aluminas demonstrated significantly improved adsorption capacity and faster kinetics to those of the commercial activated aluminas in fluoride removal by adsorption process. MA-2 prepared using stearic acid, in particular, demonstrated an adsorption capacity (14.26 mg/g) and initial adsorption rate (14.6 mg/g min) that were respectively 2.2 and 45 times higher than those of a commercial gamma alumina. The textural features of larger surface area and relatively smaller pore size in MA-2 compared to the activated aluminas are believed to be responsible for this enhancement in adsorption process. |
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