酸是纤维素水解反应的催化剂,这已为大家所悉知。但是对于纸张中存在的微量金属(最通常是铁),它们对纤维素氧化反应起催化作用却并非为许多人所了解或得到应有的重视,本文试就此谈点看法。 我们知道,纤维素是由许多葡萄糖脱水聚合而成的高分子化合物,它含有多个羟基。而羟基的存在,使它具有一些特殊的性质。例如,在一定的条件下,氢氧基会发生氧化反应,有的变成醛基(—CHO),有的变成酮基(—C0)或羧基(—C00H),从而产生了一系列与原来纤维素结构不同的物质——氧化纤维素,使纸张的机械强度下降。但是,纸张中若有微量金属(如铁)的存在,则将加速氧化 Acids are catalysts for the hydrolysis of cellulose and are well known to all. But for the trace metals present in the paper, most often iron, they catalyze the oxidation of cellulose and are not understood or deserved the attention of many people. We know that cellulose is a polymer made by dehydration polymerization of many glucose compounds, which contains multiple hydroxyl groups. The existence of hydroxyl, it has some special properties. For example, under certain conditions, the oxidation of hydroxyl occurs, some become aldehyde (-CHO), some become keto (-C0) or carboxyl (-C00H), resulting in a series of reactions with The original cellulose structure of different substances - oxidized cellulose, so that the mechanical strength of paper decreased. However, the presence of trace amounts of metal (such as iron) in the paper accelerates oxidation