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本文测定了硅胶自水中对Triton X-100的吸附,其吸附等温线呈不平常的S型,极限吸附量相当于1.00nm~2/分子,约比气液界面上的大一倍。加入0.1M的NaCl和改变pH对吸附无可察觉的影响。硅胶基本不吸附烷基硫酸钠。当Triton X-100的浓度低于其在混合溶液中的CMC时,烷基硫酸钠的存在对Triton X-100的吸附无影响;但其极限吸附量则随烷基硫酸钠浓度的增大而降低;烷基硫酸钠的碳氢链越长,这种效应就越显著。根据相分离模型,以及只有分子状态的Triton X-100被吸附而胶团不被吸附的假设,可以解释所得结果。 相似文献
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The adsorption of Triton X-100 and pure sodium n-alkyl sulfates (C_8, C_(10) and C_(12)) from single and mixed aqueous solutions on silica gel at 25°C has been determined. The adsorption of Triton X-100 shows unusual S-type isotherm. At higher concentrations, the adsorption isotherm reaches a plateau. This plateau coverage corresponds approximately to 1.00 nm~2 per adsorbed molecule. It seems that the packing of adsorbed Triton X-100 on silica/water interface is much less dense than that on the air/water interface. No significant effects of pH and of the presence of sodium chloride (0.1 M) have been observed. Moreover, no significant adsorption for sodium n-alkyl sulfates has been observed, either from single or from the mixed solutions. Thus the competitive adsorption between Triton X-100 and sodium n-alkyl sulfates may not be important.When dealing with the adsorption of Triton X-100 from the mixed solutions, there are two different effects and two different concentration regions can be discerned; ( 相似文献
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