双阳离子有机膨润土吸附处理水中有机物的性能

Property of dual-cation organobentonites to remove organic compounds from water.

分别用长碳链季铵盐（ 如溴化十二烷基三甲铵、溴化十四烷基苄基二甲铵、溴化十六烷基三甲铵、溴化十八烷基三甲铵） 和短碳链季铵盐（ 如溴化四甲基铵） 按一定配比混合改性膨润土，制得一系列双阳离子有机膨润土．研究了双阳离子有机膨润土吸附水中对硝基苯酚、苯酚、苯胺的适宜条件、性能、作用机理．结果表明，双阳离子有机膨润土的层间距、有机碳含量和对有机物的吸附性能与改性时长、短碳链季铵盐的组成及配比有关，水中有机物的去除效果还与其本身的性质有关；所用的双阳离子有机膨润土对有机物的吸附符合 Ｆｒｅｕｎｄｌｉｃｈ 或 Ｌａｎｇｍｕｉｒ 等温式，是表面吸附作用和分配作用共同作用的结果．

A series of dual-cation organobentonites are synthesized by exchanging both long-chain quaternary ammonium such as dodecyltrimethylammonium bromide (DTMAB), tetradecylbenzylbimethylammonium chloride (TPAC), cetyltrimethylammonium bromide (CTMAB), octadecyltrimethylammonium bromide (OTMAB) and short-chain quaternary ammonium such as tetramethylammonium bromide (TMAB) on bentonit. The optimal conditions, properties and mechanisms for dual-cation organobentonites to sorb p-nitrophenol, phenol, aniline from water are investigated in detail. The interlayer spacings and organic carbon contents of dual-cation organobentonite,the removal rates and sorption amounts for dual-cation organobentonites to treat organic compounds are relative to the ratio of long-chain and short-chain quaternary ammonium and the length of alkyl-chain of long-chain quaternary ammonium exchanging on bentonite. Sorption isotherms of p-nitrophenol,phenol,aniline are characterized by nonlinear, and fit to the Langmuir and Freundlich equations. Sorption of p-nitrophenol, phenol, aniline to dual-cation organobentonites are caused by both adsorption and partition.