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苯胺黑药(学名:二苯胺基二硫代磷酸)是一种良好的有色金属硫化矿浮选捕收剂,属于典型的难降解有机污染物。为研究臭氧氧化苯胺黑药的条件和氧化反应的动力学,选用臭氧作为氧化剂,对苯胺黑药浓度和模拟废水的COD进行测定。结果表明,用5 g/h的臭氧氧化20 min后,初始浓度50、75和150 mg/L的苯胺黑药模拟废水的COD去除率分别为56%、59%和76%,苯胺黑药浓度的去除率分别达到100%、99%和88%,反应后废水p H变为强酸性(<4)。对应的氧化反应动力学表观一级速率常数k为-0.372 s-1、-0.331 s-1和-0.259 s-1;R2为0.9926、0.9949和0.9903。探讨了臭氧氧化苯胺黑药前后p H变化的机理。
Aniline black medicine (scientific name: diphenylamine-dithiophosphate) is a good non-ferrous sulfide flotation collector, is a typical refractory organic pollutants. In order to study the conditions of ozone oxidation of aniline black drugs and the kinetics of oxidation reaction, ozone was chosen as oxidant to determine the concentration of aniline black drug and COD of simulated wastewater. The results showed that the COD removal efficiencies of simulated aniline black liquor with initial concentrations of 50, 75 and 150 mg / L were 56%, 59% and 76%, respectively, after being oxidized with 5 g / h ozone for 20 min. The removal efficiencies reached 100%, 99% and 88%, respectively. The pH of the wastewater became strongly acidic (<4) after the reaction. The corresponding first order rate constants for oxidation kinetics were -0.372 s-1, -0.331 s-1 and -0.259 s-1, and R2 was 0.9926, 0.949 and 0.9903, respectively. The mechanism of p H change before and after ozonized aniline black drug was discussed.