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表面活性剂在氧化物表面上的吸附,因其在浮选中的重要作用而被广泛研究。但迄今为上的工作多是关于表面活性离子在电性相反的氧化物表面上,例如阳离子表面活性剂在带负电的氧化物表面上的吸附,而对电性相同的表面活性离子的吸附则很少涉及,虽然许多实际问题中遇到的是后一种情形。本工作研究了烷基硫酸钠在带负电的TiO_2表面上的吸附,根据吸附与电泳的实验结果计算了吸附自由能,并提出了可能的吸附机理。
The adsorption of surfactants on oxide surfaces has been extensively studied for their important role in flotation. However, up to now, most of the work on the surface active ions on the opposite oxide surface, such as the cationic surfactant adsorption on the negatively charged oxide surface, while the same electricity for the adsorption of surface active ions Rarely involved, though many of the practical problems encountered are the latter. In this work, the adsorption of sodium alkyl sulfate on the negatively charged TiO 2 surface was studied. The free energy of adsorption was calculated based on the experimental results of adsorption and electrophoresis, and the possible adsorption mechanism was proposed.