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通过烧杯试验研究水处理常用氧化剂KMnO_4氧化水中甲硫醚的效能,探讨了KMnO_4投加量、甲硫醚初始质量浓度、p H值及腐殖酸质量浓度对氧化反应的影响,并对反应动力学及氧化产物进行了分析。结果表明:不同剂量的KMnO_4氧化甲硫醚反应在t=10 min内已基本完成,去除率达99%;随KMnO_4投加量增加,去除率和反应速率增加;KMnO_4过量条件下甲硫醚初始质量浓度对反应速率和去除率无影响;p H值对反应速率常数影响较显著,当p H=6.85时,反应速率常数达到最大;0~30 mg/L的腐殖酸对甲硫醚去除率基本无影响,但对反应速率有一定的抑制作用。腐殖酸质量浓度在0~15 mg/L变化时,反应速率常数基本不变;腐殖酸质量浓度从15 mg/L增大到20mg/L时,反应速率常数迅速变小,反应进程变慢;而当腐殖酸质量浓度大于等于20 mg/L时,反应速率常数又基本不变。KMnO_4氧化甲硫醚的反应符合二级反应动力学模型,二级反应的动力学常数k=0.647 L/(min·mg)。通过GC/MS对反应产物分析发现,KMnO_4可将甲硫醚氧化为二甲基亚砜。因此,KMnO_4是一种高效、快速的去除水中甲硫醚的氧化剂。
The effects of KMnO_4 dosage, initial concentration of methyl sulfide, p H value and humic acid concentration on the oxidation reaction were studied through the beaker test of methyl sulfide in KMnO_4, a common oxidant for water treatment. The effects of reaction kinetics Learning and oxidation products were analyzed. The results showed that the reaction of KMnO_4 methyloxide with different dosages was basically completed within t = 10 min, the removal rate reached 99%. The removal rate and reaction rate increased with the increase of KMnO_4 dosage. The mass concentration had no effect on the reaction rate and removal rate; the p H value had a significant effect on the reaction rate constant, and reached the maximum when p H = 6.85; the removal rate of the methyl sulfide was 0 ~ 30 mg / L Rate basically no effect, but the reaction rate has a certain inhibitory effect. When the mass concentration of humic acid changed from 0 mg / L to 15 mg / L, the reaction rate constant remained unchanged. When the mass concentration of humic acid increased from 15 mg / L to 20 mg / L, the reaction rate constant decreased rapidly and the reaction course became variable Slow; when the humic acid concentration is greater than or equal to 20 mg / L, the reaction rate constant and basically the same. The reaction of KMnO_4 methyloxide met the second-order kinetic model. The kinetic constant of the second-order reaction was k = 0.647 L / (min · mg). Analysis of the reaction product by GC / MS found that KMnO 4 can oxidize dimethyl sulfide to dimethyl sulfoxide. Therefore, KMnO_4 is an efficient and rapid oxidizer for removing methyl sulfide from water.