Solubilization capabilities of mixtures of cationic Gemini surfactant with conventional cationic, nonionic and anionic surfactants towards polycyclic aromatic hydrocarbons
Solubilization capabilities of mixtures of cationic Gemini surfactant with conventional cationic, nonionic and anionic surfactants towards polycyclic aromatic hydrocarbons
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DOI：
10.1016/j.jhazmat.2009.01.022
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发表时间：
2009-08-15
影响因子：
13.6
通讯作者：
Dar, Aijaz Ahmad
中科院分区：
文献类型：
--
作者：
Kabir-ud-Din;Shafi, Mohammad;Dar, Aijaz Ahmad
采用分光光度法研究了Gemini表面活性剂C_（16）H_（33）N ~+（CH_3）（2）-（CH_2）（5）-N ~+（CH_3）（2）C_（16）H_（33）2Br ~-（G）与氯化十六烷基吡啶（CPC）、丁二酸二（2-乙基己基）酯磺酸钠（AOT）和Brij 56等摩尔混合胶束溶液在25 ℃下对多环芳烃（PAHs）芘和蒽的增溶能力，并进行了比较.结果表明，无论表面活性剂的类型，多环芳烃的溶解度线性增加与表面活性剂浓度的增加，作为一个后果之间的关联多环芳烃和胶束。用摩尔增溶比（MSR）、胶束-水分配系数（K-m）、胶束与多环芳烃的结合常数（K-1）与表面活性剂溶液聚集数（N）的比值以及多环芳烃增溶自由能（Δ G（s）（0））等定量表征了胶束对多环芳烃的增溶能力。等摩尔二元表面活性剂混合物显示出更高的增溶能力比它们各自的单独的表面活性剂，除了G-CPC，其中的值介于两者之间。混合胶束化参数即相互作用参数、混合胶束中β胶束的摩尔分数X-i和活度系数f（i）。使用Rubingh方法进行评估。然后使用规则溶液法（RSA）将X-j值用于评估混合胶束的增溶效率。此外，实验胶束-水分配系数的烃类进行了比较，理论预测的几何平均方程的混合Gemini-常规表面活性剂体系。这种混合系统有望通过降低所施加的表面活性剂水平和因此的修复成本来改善表面活性剂增强的土壤和沉积物修复的性能。(C)2009爱思唯尔有限公司版权所有。
Solubilization capabilities of equimolar mixed micellar solutions of Gemini surfactant, C16H33N+(CH3)(2)-(CH2)(5)-N+(CH3)(2) C16H33 2Br- (G) with cetylpyridinium chloride (CPC), sodium bis(2-ethylhexyl)sulfosuccinate (AOT) and Brij56 towards polycyclic aromatic hydrocarbons (PAHs), viz pyrene and anthracene are studied spectophotometerically at 25 degrees C and then compared. The results showed that irrespective of the surfactant type, the solubility of PAHs increases linearly with increasing surfactant concentration, as a consequence of association between the PAH and micelles. Solubilization capacity has been quantified in terms of molar solubilization ratio (MSR), micelle-water partition coefficient (K-m), ratio of binding constant (K-1) between the micelle and PAH to the aggregation number (N) of surfactant solution and free energy of solubilization (Delta G(s)(0)) of PAHs. Equimolar binary surfactant mixtures showed higher solubilization capacity than their respective individual surfactants except G-CPC wherein the values were intermediate between the two. The mixed micellization parameters viz interaction parameter, beta micellar mole fraction within the mixed micelle, X-i, and activity coefficients, f(i). were evaluated using Rubingh approach. The values of X-j were then employed to evaluate solubilization efficiency of mixed micelles using Regular solution approach (RSA). In addition experimental micelle-water partition coefficients of hydrocarbons have been compared with those predicted theoretically by geometric mean equation for mixed Gemini-conventional surfactant systems. Such mixed systems promise to improve the performance of surfactant enhanced remediation of soils and sediments by decreasing the applied surfactant level and thus remediation cost. (C) 2009 Elsevier B.V. All rights reserved.