Alkaline hydrogen peroxide bleaching of cellulose
Alkaline hydrogen peroxide bleaching of cellulose
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DOI：
10.1023/a:1009273701191
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发表时间：
2000-09-01
期刊：
影响因子：
5.7
通讯作者：
Moore, SB
中科院分区：
文献类型：
--
作者：
Brooks, RE;Moore, SB
设计了一种封闭系统漂白装置，测定了各种因素对纺织纤维素织物碱性过氧化氢漂白的动力学和影响。证实过羟基阴离子是碱性过氧化氢体系的主要漂白基团。利用该仪器对织物颜色、废氧进行测定，并随后对羟基离子、过氧化氢分子进行计算，证实了碱性漂白体系中pH值和“游离”过氧化氢的滴定不是很好的漂白机理指标。确定了纤维素本身在化学漂白系统中的作用。在过羟基阴离子浓度为60°c和90°c时，棉织物的漂白速率为一级反应。估计活化能为17千卡/摩尔。发现H2O2分解为废氧为二级动力学。
A closed system bleaching apparatus was designed to determine the kinetics and effects of various factors on alkaline hydrogen peroxide bleaching of textile cellulose fabrics. It was confirmed that perhydroxyl anion is the primary bleaching moiety in alkaline hydrogen peroxide systems. The use of the apparatus in the measurement of fabric color, waste oxygen, and the subsequent calculation of hydroxyl ion, and molecular hydrogen peroxide confirmed that pH and titration of 'free' hydrogen peroxide in alkaline bleaching systems are not good indicators of bleaching mechanism. The role of the cellulose itself in the chemical bleaching system was determined. The rate of bleaching on cotton fabric was shown to be a first order reaction in concentration of perhydroxyl anion at 60 and 90 degreesC. An activation energy of 17 kcal/mole was estimated. Decomposition of H2O2 into waste oxygen was found to be second order kinetics.