Investigation on the solubilization of polycyclic aromatic hydrocarbons in the presence of single and mixed Gemini surfactants.
Investigation on the solubilization of polycyclic aromatic hydrocarbons in the presence of single and mixed Gemini surfactants.
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DOI：
10.1016/j.jhazmat.2011.04.019
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发表时间：
2011-06
影响因子：
13.6
通讯作者：
Jia Wei;G. Huang;C. An;Hui Yu
中科院分区：
文献类型：
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作者：
Jia Wei;G. Huang;C. An;Hui Yu
研究了一系列单阳离子双子表面活性剂(CGs，S=4，8，12和16)及其等摩尔二元组合(Cg12-m，m=4，8和16)对萘(Naph)、菲(Phen)和芘(Py)的增溶作用。定量讨论了它们的表面性质与对三种多环芳烃(PAHs)的增溶能力之间的关系。所选的单一Gemini表面活性剂除CG8对Py有较强的增溶能力外，其余均能显著提高多环芳烃的水溶性，其顺序为Phen>Py>Naph。对于同一有机化合物，单一Gemini表面活性剂的增溶能力与CMC值的变化趋势顺序一致。然而，不同的混合Gemini表面活性剂体系对不同的多环芳烃表现出选择性增溶作用，这不仅仅与它们的混合摩尔性质有关。与其它增溶体系相比，CG12-16表面活性剂对Py的增溶作用相对较好，对Phen的增溶作用较差。这可能归因于表面活性剂的结构与溶质和表面活性剂的化学性质之间的关系。本文的分析为选择增溶水不溶性化合物的混合双子表面活性剂提供了有价值的信息。
Water solubility enhancements of naphthalene (Naph), phenanthrene (Phen) and pyrene (Py) by a series of single cationic Gemini surfactants (CGs,s= 4, 8, 12 and 16) as well as their equimolar binary combinations (CG12-m,m= 4, 8 and 16) have been investigated. The relationships between their surface properties and solubilizing capacities toward three polycyclic aromatic hydrocarbons (PAHs) have been quantified and discussed. The selected single Gemini surfactants observably enhance the water solubility of PAHs following the order of Phen > Py > Naph except for CG8which has a superior solubilizing ability for Py. For the same organic compound, the solubilizing abilities of single Gemini surfactants are in tune with the order of variation tendencies of CMC values. However, the different mixed Gemini surfactant systems have shown selective solubilization on various PAHs which is not simply related to their mixed molar properties. Particularly, the CG12-16surfactant has relatively comparable solubilization on Py and inferior solubilization on Phen compared to all other investigated solubilizing systems. It is presumably attributed to the relationships between the structure of surfactants and the chemical nature of both solutes and surfactants. The analysis studied herein has provided valuable information for the selection of mixed Gemini surfactants for solubilizing water-insoluble compounds.