Reversibly enhanced aqueous solubilization of volatile organic compounds using a redox-reversible surfactant

查看全文 作　　者：Yingjie Li Senlin Tian Hong Mo Ping [1]Ning

机构地区：[1]Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

出　　处：《Journal of Environmental Sciences》索引2011年第23卷第9期,共5页

基　　金：supported by the National Nature Science Foundation of China (No.20607008,21077048);the National Science Research Foundation of Yunnan Province Educational Office (No.07Y11138) 摘　　要：Surfactant-enhanced remediation (SER) is an effective method for the removal of volatile organic compounds (VOCs) from contaminated soils and groundwater.To reuse the surfactant the VOCs must be separated from the surfactant solutions.The water solubility of VOCs can be enhanced using reversible surfactants with a redox-acive group,(ferrocenylmethyl)dodecyldimethylammonium bromide (Fc12) and (ferrocenylmethyl)tetradecanedimethylammonium bromide (Fc14),above and below their critical micelle concentrations (CMC) under reducing (I + ) and oxidative (I 2+ ) conditions.The CMC values of Fc12 and Fc14 in I + are 0.94 and 0.56 mmol/L and the solubilization of toluene by Fc12 and Fc14 in I + for toluene is higher than the solubilization achieved with sodium dodecyl sulfate,cetyltrimethylammonium bromide and Trition X-114.The solubilization capacity of the ferrocenyl surfactants for each tested VOCs ranked as follows: ethylbenzene > toluene > benzene.The solubilities of VOCs by reversible surfactant in I + were 30% higher than those in I 2+ at comparable surfactant concentrations.The effects of Fc14 concentrations on VOCs removal efficiency were as follows: benzene > toluene > ethylbenzene.However,an improved removal efficiency was achieved at low ferrocenyl surfactant concentrations.Furthermore,the reversible surfactant could be recycled through chemical approaches to remove organic pollutants,which could significantly reduce the operating costs of SER technology. 关键词：挥发性有机化合物表面活性剂增溶能力氧化还原十六烷基三甲基溴化铵可逆临界胶束浓度水溶液

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Reversibly enhanced aqueous solubilization of volatile organic compounds using a redox-reversible surfactant

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