十二烷基苯磺酸钠与聚丙烯酰胺在高岭土上的吸附

ADSORPTION OF SODIUM DODECYLBENE SULFONATE AND POLYACRYLAMIDE ONTO KAOLINITE

本文测定了十二烷基苯磺酸纳SDBS与部份水解聚丙烯酰胺HPAM混合溶液在高岭土上的吸附量,得到某组分浓度一定时,吸附量对另一组分浓度的扫描曲线,并根据聚合物、活性剂、溶剂及粘土间的相互作用,分析了吸附机理,其中粘土溶解或交换下来的高价阳离子(如Ca^(2+))在活性剂、聚合物或聚合物一胶束缔合物及粘土间的分配,是决定吸附量变化的主要因素;还有盐效应、竞争吸附、大分子粘滞效应等,亦是影响吸附量大小的重要因素。SDBS在纳型高岭土上的吸附符合Langmuir型吸附;混合体系中,当SDBS浓度远超过CMC值后,HPAM吸附量趋于零。

This paper tested the adsorbed amount of SDBS and HPAM onto kaolinite surface, obtained the uptake amount versus the concentration of one component under definite concentration of another component, and analyzed the adsorption mechanism on the basis of mutual interaction among polymer, surfactant, solvent and clay. It is a prevailing factor determining the uptake that polyvalent cations caused by the solution and exchange of clay distribute among surfactant, polymer, polymer-micell complex and clay. Besides, salt effect, competition adsorption, macromolecule viscosity etc. are important parameters. The uptake amount of SDBS onto Na-kaolinite fits in with Langmuir-Model, and in the mixed system, the adsorbed amount of HPAM tends to zero when the concentration of SDBS exceeds CMC value.