论文部分内容阅读
研究了25℃C时TritonX-100(TX100)、TritonX-305(TX305)和溴化十六烷基三甲铵(CTAB)的单纯溶液和混合溶液在硅胶和甲基化硅胶上的吸附。对于硅胶自CTAB-TX100和CTAB-TX305混合溶液中吸附的体系,在低浓度吋显示协同效应,而在高浓度时显示对抗效应。但后一体系的两种效应不如前一体系的明显。这种协同效应来源于已被吸附的TX分子及CTA+离子碳氢链之间的相互作用。高浓度时的对抗效应则是由于体相溶液中形成混合胶团所引起的结果。因为甲基化硅胶不吸附CTA+离子,故甲基化硅胶对TX100-CTAB的混合吸附,在低浓度时无协同效应;但在高浓度时,TX100的吸附由于CTAB的存在而明显受到抑制,这同样也是形成混合胶团的结果。随TX100吸附量的增加,CTA+离子可以通过疏水链的相互作用而进入甲基化硅胶上的TX100吸附层,从而使CTA+离子的吸附变得明显。甲基化硅胶自单纯的TX305和CTAB溶液及其混合的溶液中都几乎完全不吸附。
The adsorption of pure solutions and mixed solutions of TritonX-100 (TX100), TritonX-305 (TX305) and cetyltrimethylammonium bromide (CTAB) on silica gel and methylated silica gel was studied at 25 ℃. Systems adsorbed on silica gel from a mixed solution of CTAB-TX100 and CTAB-TX305 showed a synergistic effect at low concentrations and a confrontational effect at high concentrations. However, the latter two systems are not as obvious as the previous system. This synergistic effect is due to the interaction between the adsorbed TX molecule and the CTA + ionic hydrocarbon chain. The antagonistic effect at high concentrations is due to the formation of mixed micelles in the bulk solution. Because methylated silica gel does not adsorb CTA + ions, the mixed adsorption of methylated silica gel on TX100-CTAB has no synergistic effect at low concentration, but at high concentration, the adsorption of TX100 is significantly inhibited due to the presence of CTAB It is also a result of the formation of mixed micelles. With the increase of the adsorption capacity of TX100, CTA + ions can enter the TX100 adsorption layer on the methylated silica gel through the interaction of hydrophobic chains, so that the adsorption of CTA + ions becomes obvious. Methylated silica gel almost completely does not adsorb from the pure TX305 and CTAB solutions and their mixed solutions.