Efficiency of single and mixed Gemini/conventional micelles on solubilization of phenanthrene
Efficiency of single and mixed Gemini/conventional micelles on solubilization of phenanthrene
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DOI：
10.1016/j.cej.2010.12.063
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发表时间：
2011-03
影响因子：
15.1
通讯作者：
Jia Wei;G. Huang;Hui Yu;C. An
中科院分区：
文献类型：
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作者：
Jia Wei;G. Huang;Hui Yu;C. An
研究了阳离子Gemini表面活性剂（CG）、4种阳离子和非离子常规表面活性剂（Brij35、TX100、CPC和DTAB）及其等分子量二元组合（CG/Brij35、CG/TX100、CG/CPC和CG/DTAB）对菲（PHE）水溶性的增强作用。用临界胶束浓度（CMC）、摩尔增溶比（MSR）和胶束-水分配系数（Km）量化了它们的增溶效率以及结构与对PHE增溶能力的关系。根据Clint， Rubingh， Edwards和Treiner的方法，讨论了混合胶束的理想/非理想性。研究发现，CG和等摩尔二元表面活性剂体系均能显著提高苯丙氨酸的水溶性。CG/非离子表面活性剂的增溶能力明显高于其对应的常规表面活性剂，而CG/阳离子表面活性剂则相反。这可能归因于胶束核心增溶与胶束-水界面吸附之间的“互补-抵消”效应。Gemini与具有相同链长的传统表面活性剂之间的相互作用变得更加强烈，无论是正作用还是负作用。这些结果表明，具有相同链长的CG/非离子混合表面活性剂更适合用于土壤和水的修复。
Water solubility enhancement of phenanthrene (PHE) by a cationic Gemini surfactant (CG), four cationic and nonionic conventional surfactants (Brij35, TX 100, CPC and DTAB) as well as their equimolar binary combinations (CG/Brij35, CG/TX100, CG/CPC and CG/DTAB) have been studied and compared. Their solubilization efficiency and relationship between the structure and the solubilizing capacity towards PHE have been quantified in terms of the critical micelle concentration (CMC), the molar solubilization ratio (MSR) and the micelle–water partition coefficient (Km). The ideality/nonideality of the mixed micelles has been discussed in light of Clint, Rubingh, Edwards and Treiner's approaches. It has been observed that both CG and equimolar binary surfactant systems remarkably enhanced the water solubility of PHE. The solubilizing capacity of CG/nonionic surfactants is particularly higher than their corresponding conventional surfactant while the contrary results have been shown by CG/cationic surfactants. This may be attributed to the “complement–counteract” effect between the micellar core solubilization and the micelle–water interface adsorption. The interaction between the Gemini and the conventional surfactants with the same chain length becomes more intense regardless of the positive or the negative effect. These results demonstrate and suggest that CG/nonionic mixed surfactants with the same chain length are more appropriate to employ for soil and water remediation.