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环境化学  2015 

离子型表面活性剂对菲在碳纳米管上吸附的影响

Keywords: ,碳纳米管(CNT),十二烷基三甲基氯化铵(DDTMA),十二烷基苯磺酸钠(SDBS),吸附

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Abstract:

采用批量实验法,研究了菲在碳纳米管上的吸附以及阴/阳离子表面活性剂,十二烷基苯磺酸钠(SDBS)和十二烷基三甲基氯化铵(DDTMA)对菲吸附的影响.菲在单壁碳纳米管和多壁碳纳米管上吸附符合Freundlich等温线,n值分别为0.24和0.37,呈高度非线性;lgKF值分别为7.34和6.41,比一般土壤有机质吸附能力高出2个数量级以上,并且单壁碳纳米管对菲的吸附能力强于多壁碳纳米管.总体上,SDBS和DDTMA对菲在碳纳米管上的吸附均表现为抑制作用,抑制程度随表面活性剂浓度增加而增加,随菲浓度增加而减弱.但是当DDTMA浓度较大时(1000mg·L-1),对于菲在吸附能力较低的多壁碳纳米管上的吸附的抑制程度降低;特别是当菲浓度较大时,对菲的吸附反而有促进作用.这是因为DDTMA在碳纳米管表面形成的类(混合)胶束结构对菲的吸附促进作用部分抵偿(或超过)了其占据多壁碳纳米管表面的吸附抑制作用.

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