MnOx/GAC多相催化臭氧氧化降解有机物机理探讨

通过考察羟基自由基抑制剂——叔丁醇对MnOx／GAC多相催化臭氧氧化过程的影响，探讨了其对有机物的降解是否遵循羟基自由基反应机理。试验结果表明，叔丁醇的存在并未降低MnOx／GAC多相催化臭氧氧化对贿基苯的降解效率，由此可推断羟基自由基并非是MnOx／GAC多相催化臭氧氧化反应中的主导活性氧化物种。此外，MnOx／GAC多相催化臭氧氧化降解硝基苯的效果也未受重碳酸盐的影响。因此，MnOx／GAC多相催化臭氧氧化工艺可能比遵循羟基自由基反应机理的其他高级氧化法具有更广泛的适用性。

Discussion on Mechanism of MnOx/GAC Heterogeneous Catalytic Ozonation Process for Organic Pollutants Degradation

The reaction mechanism of the MnOx/GAC heterogeneous catalytic ozonation for organic pollutants degradation was discussed by studying the effect of t-butanol on the catalytic ozonation process. It is found that the presence of t-butanol has no inhibitory effect on the heterogeneous catalytic ozonation for the degradation of nitrobenzene. It is inferred that the hydroxyl radicals are not the dominating oxidative species in the MnOx/GAC heterogeneous catalytic ozonation process. It is also found that the degradation efficiency of nitrobenzene by the MnOx/GAC heterogeneous catalytic ozonation does not change in the presence of bicarbonate. So the heterogeneous catalytic ozonation process may have advantage over other advanced oxidation processes.