腐霉利在水溶液中的光化学降解研究

研究了3种浓度的腐霉利在3种光源下的光化学降解途径,并考察了溶液pH、硝酸盐和H2O2对腐霉利水溶液光化学降解的影响。结果表明,在3种光源下,腐霉利水溶液的光解符合一级动力学反应。腐霉利的光解速率在紫外灯下是高压汞灯下的近2倍,其半衰期在高压汞灯下为43.6 min,在紫外灯下仅为28.2 min;以高压汞灯为光源,在浓度2～8 mg.L-1范围内,腐霉利的光解速率与其初始浓度呈负相关;随着溶液pH的增大,腐霉利的光解速度加快;硝酸盐对腐霉利的光解表现为光猝灭效应;而H2O2对腐霉利的光解有显著的光敏化作用。

Photochemical degradation of procymidone in aqueous solution

The aim of this paper is to investigate the photochemical degradation of procymidone.The influ-ences of 3 light sources,3 initial concentrations,pH,nitrate and H2O2 on the photodegradation of procymidone in water were studied.The results showed that the photochemical degradation of procymidone in water followed the first order reaction.The photolytic rate of procymidone under UV lamp was about two times of that under high-pressure mercury lamp,and its half-life was 43.6 min under high-pressure mercury lamp and 28.2 min under UV lamp.Using high-pressure mercury lamp as light source,the photolytic rate of procymidone was negatively correlated with its initial concentration when it was at the range of 2 mg?L-1 to 8 mg?L-1.And the photolysis rate constant decreased with the increasing of solution pH.Nitrate had quenching effect on photolysis of procymidone in aqueous solution under HPLC(high performance liquid chromatography).And H2O2 had photosensitization on the degradation of procymidone.