水体中酮硝基麝香的臭氧氧化降解研究
Degradation of synthetic musk ketone in water with ozone oxidation
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摘要: 采用臭氧氧化水体中的酮硝基麝香，考察pH、H2O2等因素对降解程度的影响，结果表明提高初始pH能加快酮硝基麝香的氧化降解，当pH为12时，反应时间1 h，酮硝基麝香几乎完全去除，浓度为2 mol/L和5 mol/L的H2O2存在有利于O3分解生成·OH自由基，使得酮硝基麝香的氧化降解速率加快，当H2O2浓度超过5 mol/L，H2O2会成为·OH的清除剂，降低·OH利用率；无论O3单独作用和O3/H2O2协同作用，酮硝基麝香降解符合准一级动力学规律；酮硝基麝香氧化降解产物包括甲酸、二乙酸和硝酸根等，其中硝基从苯环上脱落降低了硝基麝香对环境的风险。Abstract: The degradation of musk ketone in water with ozone was studied and the impact of value of pH and concentration of hydrogen peroxide on degradation was also investigated. The experimental results showed that the degradation of musk ketone was accelerated when the value of pH was improved. The musk ketone was almost all degraded at the pH of 12 within an hour. The additive of 2 or 5 mol/L concentration of hydrogen peroxide was beneficial of decomposition of ozone to hydroxyl radical which improved the degradation rate of musk ketone. The hydrogen peroxide was acted as a free radical scavenger which decreased the utilization efficiency of hydroxyl radical when the concentration of hydrogen peroxide was over 5 mol/L. The degradation law of musk ketone was satisfied with the rule of pseudo-first order reaction kinetics under the action of ozone or the hydrogen peroxide/ozone combined together. The degradation products of musk ketone included formic oxalic and nitrate radical. The removal of nitro group from benzene ring was lessened the deterioration of musk ketone to the environment.
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Key words:
- synthetic nitro-musk /
- ozone oxidation /
- pH /
- hydrogen peroxide/ozone
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