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本文研究了二苯甲酮(BP)-三乙胺(TEA)在SDS胶束水溶液中的电子转移光反应。观察到SDS胶束对BP的光还原反应具有明显的催化作用,与纯水溶液中的反应相比较,速度提高41倍。BP的光还原速度和BP浓度成正比,在低浓度胺时(<0.02M),φ~(-1)和[TEA]~(-1)成正比;而在高浓度胺时,φ~(-1)和[TEA]~(-2)成比例。动力学数据表明,在SDS胶束中有利于电子的转移反应,K_j/K_d值增加,使光还原速度提高,而在高浓度胺条件下(>0, 02M),有利于质子的转移反应,K_h/K_e值增加,使光还原反应的量子收率提高.另外,在阳离子(CTAB)和非离子(Triton X-305)胶束体系中做了对比实验,结果表明,离子型胶束的催化作用远比非离子型好。
In this paper, the electron transfer reaction of benzophenone (BP) -triethylamine (TEA) in SDS micellar aqueous solution was studied. It was observed that the SDS micelles have a significant catalytic effect on the photoreduction of BP, which is 41 times faster than the reaction in pure water. The photoreduction rate of BP was proportional to the concentration of BP, and it was proportional to [TEA] -1 at low concentration of amine (<0.02M) -1) is proportional to [TEA] ~ (-2). Kinetic data show that the SDS micelles are conducive to the electron transfer reaction, K_j / K_d value increases, the rate of light reduction increased, while in high concentrations of amine conditions (> 0, 02M), is conducive to the transfer of protons, K_h / K_e value increased, and the quantum yield of photoreduction increased.Furthermore, a comparative experiment was carried out in the cationic (CTAB) and non-ionic (Triton X-305) micellar systems. The results showed that the ionic micelles catalyzed The role is far better than the non-ionic.