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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(1000 mg.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.
The adsorption of phenanthrene on carbon nanotubes and the effect of anionic / cationic surfactants, sodium dodecyl benzene sulfonate (SDBS) and dodecyltrimethylammonium chloride (DDTMA) on the adsorption of phenanthrene Adsorption of phenanthrene on single-walled carbon nanotubes and multi-walled carbon nanotubes adsorption Freundlich isotherm, n values were 0.24 and 0.37, were highly nonlinear; lgKF values were 7.34 and 6.41, than the average soil organic matter adsorption And the adsorption capacity of phenanthrene to the phenanthrene is higher than that of the multi-walled carbon nanotubes.In general, the adsorption of phenanthrene on the carbon nanotubes by SDBS and DDTMA shows inhibition, the degree of inhibition Increased with the increase of surfactant concentration, but decreased with the increase of phenanthrene concentration.However, the adsorption of phenanthrene on multi-walled carbon nanotubes with lower adsorption capacity was inhibited when the concentration of DDTMA was higher (1000 mg.L-1) Especially when the concentration of phenanthrene is higher, the adsorption of phenanthrene on the surface of carbon nanotubes can be promoted by the adsorption of phenanthrene on the surface of carbon nanotubes, which is partially offset by the adsorption of phenanthrene on the surface of carbon nanotubes ) Occupied its adsorption inhibition on the surface of multi-walled carbon nanotubes use.