Zhu Lizhong, Chen Baoliang
Department of Environmental Science, Zhejiang University, Hangzhou 310028, Zhejiang, China.
Environ Sci Technol. 2000 Jul 15;34(14):2997-3002. doi: 10.1021/es991460z.
A series of anion-cation organobentonite are prepared by incorporating both cationic surfactant bromide dodecyltrimethylammonium (DTMAB) and anionic surfactant sodium dodecyl sulfate (SDS) to bentonite. The results indicate that the organic carbon contents of the organobentonites are proportional to the amounts of anionic and cationic surfactants in bentonite. The amount of organic pollutant removed from water depends greatly on the amount of SDS and DTMAB in the bentonite. Partition and adsorption contributions to the sorption amount of -nitrophenol on organobentonites are described quantitatively. The mixed surfactants on anion-cation organobentonites excellently created partition mediums for organic pollutants in water. The removal rate of organic pollutants from water is improved by synergistic solubilization in both anionic and cationic surfactant moieties of the organobentonites. The effect of synergistic solubilization results mainly from partition at higher concentrations or adsorption at lower concentrations.
通过将阳离子表面活性剂溴化十二烷基三甲基铵（DTMAB）和阴离子表面活性剂十二烷基硫酸钠（SDS）同时引入膨润土中，制备了一系列阴离子 - 阳离子有机膨润土。结果表明，有机膨润土的有机碳含量与膨润土中阴离子和阳离子表面活性剂的用量成正比。从水中去除的有机污染物量在很大程度上取决于膨润土中SDS和DTMAB的用量。定量描述了分配和吸附对有机膨润土上对硝基苯酚吸附量的贡献。阴离子 - 阳离子有机膨润土上的混合表面活性剂出色地为水中的有机污染物创造了分配介质。通过有机膨润土的阴离子和阳离子表面活性剂部分的协同增溶作用，提高了水中有机污染物的去除率。协同增溶作用的效果主要源于较高浓度下的分配或较低浓度下的吸附。
