臭氧过氧化氢(O_(3)/H_(2)O_(2))降解2,4,6-三氯酚的多因素影响

Multi-Factor Influences of O_(3)/H_(2)O_(2) on Degradation of 2,4,6-Trichlorophenol

采用O_(3)/H_(2)O_(2)高级氧化工艺,对2,4,6-三氯酚(2,4,6-TCP)进行降解试验。结果表明:O_(3)/H_(2)O_(2)高级氧化工艺能有效降解2,4,6-TCP,去除率与时间的关系符合一级动力学模型;H_(2)O_(2)浓度、2,4,6-TCP初始浓度、pH及阴离子对2,4,6-TCP的降解均有影响;增加H_(2)O_(2)浓度对降解反应整体有利,但随H_(2)O_(2)浓度逐渐增大,其降解速率提高的程度越来越小;2,4,6-TCP初始浓度越低,其降解效果越好;随着pH的增加,降解速率也逐渐增加,且在酸性条件下对降解速率的影响明显比碱性条件影响大;Cl^(-)、SO_(4)^(2-)对降解反应起抑制作用,HCO_(3)^(-)、CO_(3)^(2-)、NO_(3)^(-)对降解反应起促进作用,促进反应速率常数的程度为:CO_(3)^(2-)>HCO_(3)^(-)>NO_(3)^(-)>无阴离子>SO_(4)^(2-)>Cl^(-)。

Experimental results of degradation of 2,4,6-trichlorophenol(2,4,6-TCP)by O_(3)/H_(2)O_(2)advanced oxidation process showed that O_(3)/H_(2)O_(2)advanced oxidation process can effectively degraded 2,4,6-TCP,and the relationship between removal rate and time conformed to first-order kinetic model.H_(2)O_(2)concentration,initial mass concentration of 2,4,6-TCP,pH value and anions had effects on the degradation of 2,4,6-TCP.Increasing the concentration of H_(2)O_(2)was beneficial to degradation reaction,but with the increase of concentration of H_(2)O_(2),degradation rate increased less and less.The lower initial mass concentration of 2,4,6-TCP,the better the degradation effect.With the increased of pH value,degradation rate gradually increased,and under the same pH value increased,the influence of acidic conditions on degradation reaction rate constant was greater than that of alkaline conditions.Cl^(-),SO_(4)^(2-) inhibited the degradation reaction,while HCO_(3)^(-),CO_(3)^(2-) and NO_(3)^(-) promoted degradation reaction.Degree of promoting reaction rate constant was CO_(3)^(2-)>HCO_(3)^(-)>NO_(3)^(-)>no anions>SO_(4)^(2-)>Cl^(-).