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探讨了Fenton试剂对超高效除草剂溴嘧草醚(ZJ0777)的降解反应。考察了溴嘧草醚、过氧化氢、硫酸亚铁的初始浓度和反应温度等因素对溴嘧草醚降解反应的影响,建立了Fenton试剂降解溴嘧草醚的动力学方程。结果表明:在溴嘧草醚初始浓度分别为0.12和0.24 mmol/L时,达到其降解率90%以上所需的时间分别为32和48 h,而在溴嘧草醚为0.48 mmol/L时,反应84 h只有87%的溴嘧草醚降解;过氧化氢初始浓度在150~300 mmol/L范围内,浓度增加有利于降解反应进行;溴嘧草醚降解反应随亚铁离子浓度的增加而加快(5~20 mmol/L),但过高的亚铁离子浓度对降解反应无效。温度在25~45℃范围内,反应的表观活化能Ea为75.34 kJ/mol。溴嘧草醚的氧化降解符合假一级反应动力学模型。
The degradation reaction of ultra-efficient herbicides bromoxetine (ZJ0777) by Fenton’s reagent was discussed. The effects of bromopyrronium bromide, hydrogen peroxide, ferrous sulfate and reaction temperature on the degradation of bromopyram were investigated. The kinetic equation for the degradation of bromoxynil by Fenton’s reagent was established. The results showed that when the initial concentration of bromothiazfen was 0.12 and 0.24 mmol / L, respectively, the time required to achieve a 90% or more degradation rate was 32 and 48 h, respectively, while that of bromopyrron was 0.48 mmol / L , Only 87% of bromopyram was degraded in 84 h of reaction; the initial concentration of hydrogen peroxide was in the range of 150-300 mmol / L, and the increase of concentration was beneficial to the degradation reaction; the degradation reaction of bromopyram with the increase of ferrous ion concentration And accelerated (5 ~ 20 mmol / L), but too high ferrous ion concentration on the degradation reaction is ineffective. The apparent activation energy Ea of the reaction was 75.34 kJ / mol at a temperature in the range of 25 ~ 45 ℃. Oxacillin degradation of bromopyrrole fits the pseudo-first-order reaction kinetics model.