无纺布上的偕胺肟基团鳌合物的氧化还原反应的研究

 采用各种分析方法系统研究了含偕胺肟基因维尼无纺布与Ａｎ³⁺进行氧化还原反应时的化学结构变化、氧化还原与鳌合吸附的关系以及还原产物的结晶结构和形态．结果表明，含偕胺肟基无纺布与Ａｕ³⁺反应时，开始主要是偕胺肟基被氧化成为酰胺基．此外，有部分偕胺基因被氧化成为羧基．Ａｎ³⁺被还原的同时生成约相等当量的氢离子．反应后期或反应温度高时，氢离子生成量增大．实验结果还表明，在反应起始阶段，Ａｕ³⁺与偕胺肟基因会发生鳌合作用．还原生咸的单质Ａｎ形成“玫瑰花”状的小晶粒粘附于无纺布纤维表面．

THE REDOX REACTION OF AMIDOXIME CHELATE NONWOVEN FABRIC

y means of FTIR, elemental analysis, X--ray diffraction , SEM and other analytical methods, the redox mechanism of amidoxime chelate polyvinyl-- formal nonwoven fabric (Ac-- PVFF ) recating with An³⁺ was investigated and some valuable ideas were propose in mis paper. It can be proposed from experimental resuits that when An-- PVFF reacts with Ans+, almost amidoxime groups are oxidized to amide groups, while some are oxidized to carboxyl groups, At the same bine, the small molecular weight nitrogen--containing compounds released from the redox process are found to be mainly nitrogen oxide (NOx). As well as, H⁺ ion is produced in the redox process. Au³⁺ ions are finally reduced into ele-mental gold in redox process although some of them may be chelated by Ao-PVFF in the beggining at lower temperature. The produced gold crystallizes on Ao-PVFF in the rose-shaped and the mount of crystallite increase with the lengthning of redox duration.