胶团强化超滤中SDS胶团与镉离子的吸附特性
CHARACTERISTICS FOR SORPTION OF CADMIUM IONS ON SODIUM DODECYL SULFATE IN THE PROCESS OF MICELLAR-ENHANCED ULTRAFILTRATION
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摘要: 以十二烷基硫酸钠(SDS)作为表面活性剂,对含有Cd2+的水溶液进行胶团强化超滤分离.考察胶团强化超滤中表面活性剂与镉离子比值对镉离子吸附总量、截留率的影响,以及胶团与镉离子的吸附等温规律和吸附动力学规律,并对吸附机理进行了初步探讨.实验结果表明:Cd2+截留率可以达到97%以上,SDS与镉离子的吸附过程符合Langmuir吸附等温方程,并遵循Lagergren二级动力学规律,其吸附作用主要是化学吸附.Abstract: To separate cadmium ions from aqueous solution efficiently,micellar-enhanced ultrafiltration was used with sodium dodecyl sulfate(SDS) being surfactants.The effect of the ratio of surfactants to cadmium ions on the adsorption quantity,rejection of cadmium ions as well as adsorption isotherm law and adsorption kinetic law were investigated.The results show that the rejection rate of cadmium reaches 97% and the adsorption of cadmium ions on SDS conforms to the Langmuir adsorption isotherm and the Lagergren adsorption kinetic.The adsorption is a chemical adsorption process.
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Key words:
- micellar-enhanced ultrafiltration /
- cadmium /
- sodium dodecyl sulfate /
- adsorption
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