Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
578910 | Journal of Hazardous Materials | 2011 | 7 Pages |
Abstract
We describe a facile and simple one-pot synthesis of water-soluble amino-organoclay under ambient conditions. The clay was used to successfully remove environmentally toxic anionic metals, such as arsenate, chromate, and ferricyanide. The electrostatic interactions between the anionic metals and the protonated amino (ammonium) groups of the amino-organoclay resulted in rapid precipitation, within 3Â min, with a high removal capacity. The maximum removal capacities (in units of mg metal per g organoclay) of the amino-organoclay clay toward HAsO42â, CrO42â, or Fe(CN)63â were, 30.73Â mg/g, 34.67Â mg/g, or 218.88Â mg/g in case of 0.02Â g, 0.03Â g, and 0.005Â g of the amino-organoclay, respectively. The removal efficiencies of 0.07Â g, 0.09Â g, and 0.03Â g of the amino-organoclay whose dosage of clay was at the highest removal efficiency (%) for arsenate, chromate, and ferricyanide, respectively, presented 59.79%, 89.54%, and 97.43%. Furthermore, humic acid that ubiquitous in the organic matter present in water or soil environments, inhibited the removal rate of anionic metals, and thus the removal efficiencies toward all anionic metals were markedly reduced. Humic acid preferentially precipitated with the interaction of amino-organoclay prior to the anionic metals.
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Physical Sciences and Engineering
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Authors
Young-Chul Lee, Won-Kun Park, Ji-Won Yang,