热活化过硫酸钾降解水中吡虫啉的研究

考察了温度、过硫酸钾浓度、pH值和常见无机离子等因素对热活化过硫酸钾降解吡虫啉效果的影响,并探讨了吡虫啉的降解动力学.结果表明,吡虫啉在热活化过硫酸钾氧化体系中的降解符合一级动力学方程;随着温度和过硫酸钾浓度的增加,吡虫啉的降解率不断增加,在加热反应180 min后降解率逐渐趋于稳定;pH对降解影响较小;常见无机离子Cl~-和HCO_3~-对吡虫啉的降解都有轻微的抑制作用,NO_3~-离子对其降解基本无影响.通过GCMS检测可知,吡虫啉的降解中间产物主要为6-氯烟酸和2-氯吡啶.

Degradation of Imidacloprid by Heat Activated Persulfate Oxidation Process

The effect of temperature,initial pH,persulfate concentration and some kind of inorganic ions on the potassium persulfate oxidation degradation of imidacloprid were investigated,and the kinetics of the degradation of imidacloprid were also discussed.Results indicates that the degradation of imidacloprid followed pseudo-first-order kinetics equation. Increasing temperature and oxidant dosage could enhance the removal efficiency of imidacloprid,and the degradation rate of imidacloprid gradually stabilized after 180 minutes heating reaction. In the whole reaction process,initial pH of the solution had little effect on the degradation rate of the imidacloprid. Cl~-and HCO_3~-in the solution showed a slight inhibitory effect on the degradation of imidacloprid,but NO_3~-nearly no efficacy on the degradation of imidacloprid. Addtionally,the intermediate products from degradation of imidacloprid were mainly 6-chloronicotinic acid and 2-chloropyridine.