【摘要】 以TNT为目标污染物,考察了M n(II)催化臭氧化作用机理,以及HCO3-、pH值和催化剂投量及投加方式对催化效果的影响。结果表明,M n(II)对臭氧化TNT的催化作用明显。对于一定量的催化剂,一次性投加比多次投加时的催化效果好,催化剂的浓度为0.106m o l/L、pH值约为5时效果比较理想,废水溶液的HCO3-质量浓度为58.1m g/L或290.5m g/L时,对催化效果几乎没有影响。在催化氧化过程中,COD的去除率明显小于TNT,且TNT浓度减小与硝酸盐浓度增加的比例为1∶1,说明TNT降解不彻底。M n(II)催化臭氧化过程中产生的水合二氧化锰使胶体表面及溶液-胶体界面增加。臭氧和TNT富集,TNT的氧化分解易于发生。更多还原

【Abstract】 Objective of this study was to explore the mechanism of degrading pollutants,2,4,6-trinitrotoluene(TNT),by Mn(II)-catalyzed ozonation,and influence of bicarbonate,pH value and catalyzer dose and its dosing ways on the catalytic efficiency.The results showed that Mn(II) had a great potential to enhance ozonation of TNT.For Mn(II) dose 0.106 mol/L and its dosing way at one step,and pH value 5,TNT-degradation rate was larger than that for others.And the rates was nearly constant when bicarbonate concentration was 58.1mg/L or 290.5mg/L.The rate of COD-removal is less than that of TNT-removal and the molecular ratio of nitrate increasing and TNT decreasing was 1∶1 during Mn(II)-catalyzed ozonation process,showing that TNT was not degraded completely.During Mn(II)-catalyzed ozonation process,hydrous manganese oxide formed changes characteristics of treated water environment makes the colloid surface and interface between colloid and solution increase, TNT and ozone accumulate and TNT-degradation by ozone easily take place.更多还原