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

作　　者：Yingjie Li Senlin Tian Hong Mo Ping 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》2011年第9期1486-1490,共5页环境科学学报（英文版）

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.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：ferrocenyl surfactant REVERSIBILITY SOLUBILITY VOCs 

分 类 号：X51[环境科学与工程—环境工程] TQ423[化学工程]