阳-非离子有机膨润土对水中硝基苯的吸附作用

分别用阳离子表面活性剂CTMAB、非离子表面活性剂Triton X-100及其混合物改性膨润土制得一系列的单阳离子、单非离子、阳-非离子有机膨润土.比较了它们对水中硝基苯的吸附性能及机理.结果表明,有机膨润土吸附水中硝基苯的等温吸附曲线呈线性,主要为分配作用所致,分配作用的大小由有机膨润土有机碳含量决定,并与改性时表面活性剂的种类、组成及配比有关;阳-非离子混合表面活性剂改性的有机膨润土有机碳含量(foc)高于相应的单阳离子和单非离子有机膨润土有机碳含量的和,因此,阳-非离子有机膨润土对水中硝基苯的吸附能力显著增强.

Sorption of nitrobenzene in water by cationic-nonionic organobentonites

A series of cationic, nonionic and cationic-nonionic organobentonites were synthesized with cationic surfactant cetyltrimethyl ammonium bromide (CTMAB), nonionic surfactant Triton X-100, and their mixture, respectively. The sorption properties and mechanisms of nitrobenzene to these organobentonites from water were studied. The sorption isotherms of nitrobenzene to cationic-nonionic organobentonites were linear, which was mainly by partition. The magnitude of partition was decided by the organic carbon contents of organobentonites and also related to the kinds, compositions and ratios of the surfactants. The organic carbon contents of organobentonites (foc) cationic-nonionic organobentonites were higher than the cationic, nonionic organobentonites, thus, the sorption ability of nitrobenzene to cationic-nonionic organobentonites from water was increased markedly.