改性蛭石对有机污染物的吸附特性研究

用溴化十六烷基三甲铵对蛭石进行了改性,并研究了有机插层蛭石对水中萘胺、萘酚、苯胺、苯酚的吸附特性。结果表明:有机插层蛭石的层间距明显变大,对水中萘胺、萘酚的去除率可达90%以上,对苯胺、苯酚的去除率在80%左右。对有机污染物的吸附等温曲线符合Freund ish方程。有机插层蛭石对有机污染物的吸附既有水相与有机相之间的分配过程,又有物理吸附、静电吸附和离子交换吸附等吸附过程。

Research on the Adsorptive Characteristics of Modified Vermiculite for Organic Contaminants

The organic intercalated vermiculite was synthesized by using a cationic surfactant-cetyltrimethylammonium bromide(CTMAB).The adsorbent can be used for removing aniline,phenol,α-naphthylamine,β-naphthol,etc.organic contaminants from solutions.The research results showed that the interlayer space of the organic intercalated vermiculite has been enlarged.The removal rates of naphthylamine and naphthol were over 90%;the removal rates of aniline and phenol were about 80%.The adsorption isotherms of modified vermiculite for organic contaminants meet Freundish adsorption equation.The adsorption of organic intercalated vermiculite for organic contaminants includes distribution of the adsorbent between water phase and organic phase,the physical adsorption,electrostatic adsorption and ion-exchange adsorption.