硫酸盐竹浆光催化漂白过程中的主要影响因素

Key Influence Factors of Bamboo Kraft Pulp Photocatalysis Bleaching

首先对 2种不同催化剂类型和机理的纸浆光催化漂白进行了简述 ,并就硫酸盐竹浆光催化漂白过程的主要影响因素进行了初步探索。实验结果表明 :纸浆的光催化漂白符合Grotthus Drapper定律 ,高能量的紫外光照射是纸浆光催化漂白中不可缺少的关键因素之一 ;在光催化漂白中控制合理的碱性条件是非常重要的 ,适当的碱性环境可以促进反应顺利进行获得高白度的纸浆 ,而过高的初始pH值 ,不利于纸浆中碳水化合物的保护 ;氧气在光催化漂白中非常重要 ,没有氧气的参与 ,漂白反应不能发生。

Photocatalysis bleaching is an environment friendly bleaching process. Two different kinds of photocatalysis bleaching for pulp,singlet oxygen bleaching through sensitizer at irradiation and electron-hole pair bleaching through semiconductor at irradiation,are briefly introduced in this paper. Several key influence factors in photocatalysis bleaching were studied. The results showed: photocatalysis bleaching of pulp follows the Grotthus-Drapper Law,high energy UV irradiation is one of the key factors in photocatalysis bleaching; alkaline condition is very important,modest alkaline condition is helpful to obtain high brightness of the bleached pulp,but too high initial pH is disadvantageous to the protection of carbohydrate pulp; in addition,oxygen is another critical factor,photocatalysis bleaching can not keep on without oxygen in the system.