表面活性剂对苊的增溶作用及应用初探

WATER SOLUBILITY ENHANCEMENTS OF ACENAPHTHENE BY SINGLE- AND MIXED-SURFACTANT SOLUTION AND ITS APPLICATION

比较研究了阴、阳、非离子表面活性剂及阴 非、阳 非离子混合表面活性剂对苊的增溶作用 .SDS ,CTMAB ,TritonX 1 0 0都能显著地增加苊在水中的溶解度 ,苊在SDS ,CTMAB ,TritonX 1 0 0单体上的分配系数Kmn分别为 1 3 0× 1 0 3,0 92× 1 0 3,1 3 0× 1 0 3,在胶束相的分配系数Kmc分别为 5 6 4× 1 0 3,1 5 0× 1 0 4 ,5 5 7× 1 0 3.阴 非离子混合表面活性剂和一定条件下的阳 非离子混合表面活性剂对苊具有协同增溶作用 ,这是由于混合表面活性剂对苊的胶束分配系数Kmc增大所致 .比较了CTMA+单体态、胶束态、膨润土吸附态对苊分配作用的大小 ,以及苊在表面活性剂单体、胶束和土壤上有机质标化的分配系数Kom的大小 。

Water solubility enhancements of acenaphthene by single-surfactant,such as SDS,CTMAB,Triton X-100,and mixed-surfactant,such as Triton X-100-SDS,Triton X-100-CTMAB,were compared and evaluated.The solubility of acenaphthene in water was greatly enhancement by each of SDS,CTMAB,Triton X-100.The solubility enhancement is the results of acenaphthene partition between water and monomer or micellae.The partition coefficients(K mn)of acenaphthene between water and monomer,such as SDS,CTMAB,Triton X-100,are 1.30×10 3,0.92×10 3,and 1.30×10 3,respectively,at surfactants concentrations below CMC;the partition coefficients(K mc)of acenaphthene between water and micellae are 5.64×10 3,1.50×10 4,and 5.57×10 3,respectively,at surfactants concentrations above CMC. Acenaphthene was solubilized synergistcally by Triton X-100-SDS and Triton X-100-CTMAB mixed surfactants,which results from increasing partition coefficients of acenaphthene between water and mixed surfactant.CTMA +adsorbed by bentonite is more powerful medium than monomer or micellar in solution for partitioning acenaphthene.While partition coefficient of acenaphthene normalized by soil organic matter(K om)is intermediate between K mnand K mc.The surfactant concentration above CMC is the prerequisite of surfactant application to washing soil organic pollution.