Adsorption of Cation-nonionic Mixed Surfactants onto Sediment and Their Effects on Adsorption of Nitrobenzene from Water
阳-非离子混合表面活性剂对沉积物吸附硝基苯的影响

Adsorption behaviors of nitrobenzene, a nonionic surfactant(Triton X-100), a cation surfactant(CPC) and their mixture onto a sediment were investigated. The adsorption of Triton X-100 onto the sediment is enhanced with increasing of co-existed CPC at relatively low concentrations but decreased at relatively high concentrations. The adsorption of CPC onto the sediment decreased a little with increasing of co-existed Triton X-100. In natural waters, cation surfactants and nonionic surfactants will be largely adsorbed by soils or sediments. The adsorption of nitrobenzene onto sediment is linear and enhanced by the co-existed Triton X-100 or CPC, and will be significantly enhanced by the mixture of CPC-Triton X-100. Therefore, cation-nonionic mixed surfactants are potentially used to enhance adsorption of organic contaminants onto soils or sediments and to prepare organobentonite for improving their performance in wastewater treatment.