有机插层蛭石对有机污染物苯酚和氯苯的吸附特性研究

分别应用溴化十六烷基三甲基溴化铵(HDTMA)和溴化十六烷基吡啶(HDPY)改性插层级石对苯酚和氮苯两种非离于型环境污染物进行吸附性能研究。结果表明，蛭石原矿对苯酚和氮苯的吸附能力很小，经表面活性剂处理后其吸附能力大大增强。有机插层级石对苯酚的吸附具有表面吸附特征，其吸附等沮线为Freundish型；而对氮苯的吸附实际上是氮苯在水相与有机级石中有机相之间的一种分配过程，其吸附等沮线为直线型。苯酚和氮苯的竞争吸附并末减弱有机蛭石对氯苯的吸附能力，反而由于它们同时存在产生协同效应，使有机插层蛭石对氯苯总的吸附能力有所提高。

STUDY ON THE CHARACTERISTIC OF ORGANIC INTERCALATED VERMICULITE TO ADSORB TOXIC ENVIRONMENTAL CONTAMINATION: PHENOL AND CHLOROBENZENE

Two types of organic intercalated vermiculite were synthesized by exch anging cation surfactants such as HDTMA and HDPY on vermiculite. The sorption of environmental contaminants such as phenol and chlorobenzene by organic intercal ated vermiculite was studied. The HDTMA modified vermiculite has a great capabi lity of adsorbing phenol and chlorobenzene, depending on the content of organic carbon and the type of surfactant. The adsorption of phenol by organic vermicul ite is a surface sorption mechanism and the adsorption isotherm is of the Freund ish type. While the adsorption of chlorobenzene by organic vermiculite was a par tition mechanism between water phase and organic phase in organic vermiculite an dthe adsorption isotherm is of the linear type. The adsorptive ability of organi c vermiculite had been strengthened, not weakened, by the competitive uptake o f phenol and chlorobenzene. This feature has the practical value when organic v ermiculite is used to remove more than one contaminants from wastewater.