CTMAB-膨润土去除水中有机物的性能及机理

用溴化十六烷基三甲铵（CTMAB）改性膨润土，研究了CTMAB膨润土去除水中苯、甲苯、乙苯、硝基苯、苯胺、苯酚、对硝基苯酚的性能、机理及影响因素。结果表明，CTMAB-膨润土去除水中有机物的能力远大于原土；CTMAB-膨润土对苯、甲苯、乙苯的等温吸附曲线呈线性；对水中苯酚、对硝基苯酚的等温吸附曲线呈非线性；对苯胺、硝基苯的等温吸附曲线基本呈线性。CTMAB-膨润土吸附水中有机物的性能及机理与有机物的水溶性或辛醇－水分配系数有关。

Sorption of some organic pollutants to CTMAB bentonite from water.

CTMAB bentonite was synthesized by the exchange of cetyltrimethylammonium (CTMA) cations for inorganic ions on the internal and external surfaces of bentonite.The properties and mechanisms for CTMAB bentonite to sorb benzene, toluene, ethylbenzene, nitrobenzene, aniline, phenol and p nitrophenol in water were investigated in detail. Benzene, toluene and ethylbenzene sorption to CTMAB bentonite was characterized by linear isotherms, solute partition, between water and organic phase composed of the large alkyl functional groups of the CTMAB cations. Phenol and p nitrophenol sorption to CTMAB bentonite was caused primarily by adsorption, relatively strong solute uptake. Their isotherms were nonlinear.Nitrobenzene and aniline sorption to CTMAB bentonite was weak, and the isotherms were approximately linear. Their sorption was caused by both the partition and the solute uptake. The sorption mechanism was also studied by octanol water partition coefficients of organic compounds.