Choi Hyun-Doc, Jung Woo-Sung, Cho Jung-Min, Ryu Byung-Gon, Yang Jung-Seok, Baek Kitae
Department of Environment Engineering, Kumoh National Institute of Technology, 1 Yangho-dong, Gumi, Gyeong-buk 730-701, Republic of Korea.
J Hazard Mater. 2009 Jul 30;166(2-3):642-6. doi: 10.1016/j.jhazmat.2008.11.076. Epub 2008 Nov 30.
Highly toxic oxyanions, such as hexavalent chromium (Cr(VI)), have caused adverse effects on human health. This study evaluated the feasibility of using cationic surfactant-modified activated carbon (AC) to remove Cr(VI). To modify activated carbon using a cationic surfactant, AC was mixed with a surfactant solution of 0.5 critical micelle concentration (CMC), at which concentration the surfactant molecules exist as mono-molecules. Adsorption kinetics and an isotherm model were used to study the adsorption characteristics of Cr(VI) onto MAC. The adsorption capacity of MAC for Cr(V) was enhanced compared to that of AC. MAC modified by hexadecyltrimethylammonium had a higher adsorption capacity for the removal of Cr(VI) than that modified by cetylpyridinium. The modification of AC by a cationic surfactant enhanced both its Cr(VI) adsorption rate and its Cr(VI) adsorption capacity. The breakthrough point of MAC for Cr(VI) was 100 times greater than for the raw AC. As a result, MAC is a promising adsorbent to treat Cr(VI) in an aqueous stream.
高毒性含氧阴离子，如六价铬（Cr(VI)），已对人类健康造成不利影响。本研究评估了使用阳离子表面活性剂改性活性炭（AC）去除Cr(VI)的可行性。为了用阳离子表面活性剂改性活性炭，将AC与0.5临界胶束浓度（CMC）的表面活性剂溶液混合，在该浓度下表面活性剂分子以单分子形式存在。采用吸附动力学和等温线模型研究了Cr(VI)在改性活性炭（MAC）上的吸附特性。与AC相比，MAC对Cr(V)的吸附容量有所提高。十六烷基三甲基铵改性的MAC对Cr(VI)的去除吸附容量高于十六烷基吡啶改性的MAC。阳离子表面活性剂对AC的改性提高了其对Cr(VI)的吸附速率和吸附容量。MAC对Cr(VI)的穿透点比原始AC大100倍。因此，MAC是处理水流中Cr(VI)的一种有前景的吸附剂。
