Zhao Baowei, Zhu Lizhong, Li Wei, Chen Baoliang
Department of Environmental Science, Xixi Campus, Zhejiang University, Hangzhou 310028, China.
Chemosphere. 2005 Jan;58(1):33-40. doi: 10.1016/j.chemosphere.2004.08.067.
The effects of mixed anionic-nonionic surfactants, sodium dodecyl sulfate (SDS) mixed with Tween80 (TW80), Triton X-100 (TX100) and Brij35 respectively on the solubility enhancement and biodegradation of phenanthrene in the aqueous phase were investigated. The efficiency of solubilization and biodegradation of phenanthrene in single-, and mixed-surfactant solutions were also compared. The critical micellar concentrations (CMCs) of mixed surfactants were sharply lower than that of sole SDS. The degree of solubility enhancements by the mixed surfactants followed the order of SDS-TW80>SDS-Brij35>SDS-TX100. Synergistic solubilization was observed in the mixed surfactant solutions, in which the molar ratios of SDS to nonionic surfactant were 1:0, 9:1, 7:3, 5:5, 3:7, 1:9 and 0:1 while the total concentration of surfactants was kept at 5.0 and 10.0 mM, respectively. SDS-Brij35 exhibited more significant degree of synergistic solubility enhancement for phenanthrene. The mixed surfactants exhibited no inhibitory effect on biodegradation of phenanthrene. Substantial amounts of the solubilized phenanthrene by mixed surfactants were completely degraded by phenanthrene-degrading microorganisms within 96 h. The results suggested that anionic-nonionic surfactants would improve the performance of remediation of PAH-contaminated soils.
研究了分别将十二烷基硫酸钠（SDS）与吐温80（TW80）、曲拉通X-100（TX100）和Brij35混合的阴离子-非离子混合表面活性剂对菲在水相中的增溶作用和生物降解的影响。还比较了菲在单一表面活性剂溶液和混合表面活性剂溶液中的增溶和生物降解效率。混合表面活性剂的临界胶束浓度（CMC）明显低于单一SDS的临界胶束浓度。混合表面活性剂的增溶程度顺序为SDS-TW80>SDS-Brij35>SDS-TX100。在混合表面活性剂溶液中观察到协同增溶作用，其中SDS与非离子表面活性剂的摩尔比分别为1:0、9:1、7:3、5:5、3:7、1:9和0:1，而表面活性剂的总浓度分别保持在5.0和10.0 mM。SDS-Brij35对菲表现出更显著的协同增溶程度。混合表面活性剂对菲的生物降解没有抑制作用。混合表面活性剂增溶的大量菲在96小时内被菲降解微生物完全降解。结果表明，阴离子-非离子表面活性剂将提高多环芳烃污染土壤的修复性能。
