胶团强化超滤中SDS临界胶团浓度变化规律研究

用电导法对十二烷基硫酸钠(SDS)的临界胶团浓度(CMC)进行了研究,考虑了温度、pH值、金属离子(Cd2+、Zn2+、Pb2+)浓度变化以及SDS和3种非离子表面活性剂(Brij35、TritonX-100、APG)的复配对溶液CMC值的影响。结果表明,随温度升高,pH值上升,金属离子浓度增加以及Brij35/SDS、TritonX-100/SDS、APG/SDS混合体系配比的增加,溶液CMC值减小。特别当复配比在0.13～1时,CMC值的下降趋势非常明显。这一结果为采用胶团强化超滤技术处理电解锌废水时SDS最佳添加量的确定提供了有效的依据。

Change regulation of SDS critical micelle concentration in micellarenhanced ultrafiltration

The CMC of SDS was studied using conductivity method.The effects of temperature,pH value,concentration of metal ions(Cd2 ,Zn2 ,Pb2 ),and mixed nonionic surfactant(Brij35,TritonX-100,APG) on CMC value of the solution were considered.The result showed that,when temperature,pH value,concentration of metal ions were enhanced as well as the ratio of the mixed system(Brij35/SDS,TritonX-100/SDS,APG/SDS)increased,the CMC value of the solution decreased.Especially when the mixed concentration was between 0.13-1,the value of CMC appeared an obvious descending trend.This result could be an effective basis for the determination of optimal dosage of SDS in treatment of electrolytic zinc wastewater using MEUF technology.