联苯胺的变色反应研究

联苯胺与蒙脱石及铝柱层蒙脱石反应都生成黄色和蓝色化合物，当ｐＨ＞１．５时生成联苯胺蓝，ｐＨ＜１．５时生成联苯胺黄．实验发现，在同时满足适当的质子浓度与联苯胺浓度之比（［Ｈ＋］／［Ｂｚ］）和吸附剂与联苯胺摩尔之比（ＭＡ／ＭＢｚ）的条件下，在高ｐＨ范围（２．０～４．０）内仍可得到联苯胺黄．根据实验结果，可用方程式描述这一反应，并讨论了不同ｐＨ时生成联苯胺黄的条件

Color reaction of benzidine

The interaction of montmorillonite(non pillared clay) and alumina pillared montmorillonite(Al PILC) with benzidine results in the formation of color complexes of benzidine blue and benzidine yellow. It does not well agree with all previous investigation: the blue color appears at pH>1.5, and the yellow color at pH<1.5. Depending on the amount ratio of adsorbent and benzidine( M A/ M Bz ), and the concentration ratio between benzidine and proton(/)in the reaction system, a yellow colored complex can be observed in the high pH region between 2.0 and 4.0. Equation (1) and (2) are employed to interpret the color reaction of benzidine on the surface of a clay and a Al PILC, moreover, the condition produced the yellow complex is discussed.