热激活过硫酸盐降解丁基黄药的研究

Research on the heat-activation of persulfate for the degradation of butyl xanthate

热活化过硫酸盐是一种新兴的水处理技术,主要利用产生的硫酸根自由基(SO4·-)降解有机物。主要研究了反应温度、过硫酸盐浓度、初始p H以及过渡金属(Fe2+)对丁基黄药降解效果的影响。结果表明,提高系统反应温度能够增加丁基黄药的降解率,热激活过硫酸盐降解丁基黄药符合准一级反应动力学模型(R2>0.898 9),温度对丁基黄药降解速率的影响符合阿伦尼乌斯方程(R2>0.960 5)。当温度为20~50℃时,计算出的反应活化能为69 k J/mol。随着过硫酸盐浓度的增加,反应速率常数增加,并与过硫酸盐浓度呈现出良好的线性关系。酸性和中性条件下有利于丁基黄药的降解,此外,Fe2+的添加可以大幅度促进丁基黄药的降解。

Heat activation of persulfate is an emerging water treatment technology,which uses the produced sulfate radicals(SO4^·-） for the degradation of organic substances. The influences of reaction temperature,persulfate concentration,initial pH and transition metal（Fe^2＋） on the degradation effect of butyl xanthate have been investigated. The results show that increasing the system reaction temperature could improve the degradation rate of butyl xanthate.The heat activation of persufate for butyl xanthate degradation conforms to pseudo first order reaction kinetics（R^20.898 9）,and the influence of temperature on butyl xanthate degradation rate conforms to Arrhenius equation（R^20.960 5）. When the temperature is 20-50 ℃,the calculated activation energy is 69 k J/mol. With the increase of initial persulfate concentration,the reaction rate constant of butyl xanthate degradation increases,showing good linear relationship with persulfate concentration. Acidic and neutral pH conditions are advantageous to butyl xanthate degradation. Besides,adding Fe^2＋can significantly facilitate butyl xanthate degradation.