压力过氧化氢漂白过程中羟基自由基的研究

用化学荧光法研究碱法苇浆压力过氧化氢漂白过程中羟基自由基的浓度变化及其对漂白效果的影响。结果表明,应用邻苯二甲酰肼（即PtH）捕集羟基自由基、再经荧光法测定是可行的。漂白实验所选用的4个漂白体系的羟基自由基浓度变化规律相似,在漂白时间40 min左右时,羟基自由基的相对浓度出现一个峰值,90 min时其相对浓度都有不同程度的回升。羟基自由基的浓度变化及其对漂白效果的影响具有较明显的规律性。

Research on Hydroxyl Radicals during Pressurized H_2O_2 Bleaching of Alkaline Reed Pulp

This paper mainly studies the concentration change of hydroxyl radicals and its effect on the bleaching result during pressurized hydrogen peroxide bleaching of alkaline reed pulp by means of Chemiluminescence (CL). The results showed that under the experimental conditions , CL is an excellent method for elucidating the role of hydroxyl radicals in bleaching systems, and the changing law of the concentration of hydroxyl radicals is similar among those four bleaching systems of reed pulp. There exists a peak value at 40 min and the concentration of hydroxyl radicals will rebound at 90 min. There is an obvious regularity in the variation of hydroxyl radical concentration and its effect on bleaching efficiency under the experimental conditions.