Pandit P, Basu S
Department of Chemical Engineering, IIT Delhi, Hauz Khas, New Delhi, 110016, India.
J Colloid Interface Sci. 2002 Jan 1;245(1):208-14. doi: 10.1006/jcis.2001.7939.
In the present work, solvent extraction using reverse micelles is proposed for the removal of organic dyes from water. In this approach, the dye is solubilized in the aqueous core of the reverse micelles, which are present in the organic phase. The organic phase is subsequently separated from the aqueous phase leading to signifi-cant removal of dye. Experimental results reveal that the electrostatic interaction between the oppositely charged surfactant head group present in the reverse micelles and the dye molecule plays a key role in the separation. The removal of the anionic methyl orange dye from water is carried out in the presence of cationic hexadecyltrimethyl ammonium bromide surfactant, whereas the removal of the cationic methylene blue dye is carried out in the presence of anionic sodium dodecylbenzene sulfonate surfactant. Amyl alcohol is used as the solvent. The influence of parameters such as dye concentrations, surfactant concentrations, pH, and KCl and NaBr concentrations on the percentage removal of dye was studied. The percentage removal of dye is decreased with the increase in dye concentration in the feed. The increase in surfactant concentration resulted in higher dye removal, because more reverse micelles could be hosted in the organic phase. The increase in aqueous phase pH resulted in enhanced removal of methyl orange from water, while in the case of methylene blue the percentage removal decreased. The increase in KCl and NaBr concentrations resulted in decreased percentage removal of methylene blue, whereas the percentage removal of methyl orange was increased. The effect of pH and salt concentration is explained based on charge transfer mechanism and electrostatic interactions and dye-surfactant complex formation.
在本工作中，提出了使用反胶束进行溶剂萃取以从水中去除有机染料的方法。在这种方法中，染料溶解在存在于有机相中的反胶束的水核中。随后将有机相与水相分离，从而实现染料的显著去除。实验结果表明，反胶束中带相反电荷的表面活性剂头基与染料分子之间的静电相互作用在分离过程中起关键作用。在阳离子十六烷基三甲基溴化铵表面活性剂存在下进行从水中去除阴离子甲基橙染料的操作，而在阴离子十二烷基苯磺酸钠表面活性剂存在下进行去除阳离子亚甲基蓝染料的操作。戊醇用作溶剂。研究了染料浓度、表面活性剂浓度、pH值以及KCl和NaBr浓度等参数对染料去除率的影响。随着进料中染料浓度的增加，染料去除率降低。表面活性剂浓度的增加导致更高的染料去除率，因为有机相中可以容纳更多的反胶束。水相pH值的增加导致从水中去除甲基橙的效率提高，而对于亚甲基蓝，去除率则下降。KCl和NaBr浓度的增加导致亚甲基蓝去除率降低，而甲基橙的去除率则增加。基于电荷转移机制、静电相互作用以及染料 - 表面活性剂络合物的形成对pH值和盐浓度的影响进行了解释。
