金属锰(II)催化臭氧化TNT的机理  

Mechanism of 2,4,6-Trinitrotoluene-removal by Mn(II)-Catalyzed Ozonation

作　　者：吴耀国[1] 惠林[1] 赵晨辉[1] 王秋华[1] 冯文璐[1] 

机构地区：[1]西北工业大学应用化学系,陕西西安710072

出　　处：《火炸药学报》2006年第5期17-21,共5页Chinese Journal of Explosives & Propellants

基　　金：西北工业大学研究生创业种子基金资助(Z200669);西北工业大学本科毕业设计(论文)重点扶持项目(2005;2006)

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。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 58.1 mg/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.

关 键 词：物理化学 Mn(Ⅱ)-催化臭氧化 水合二氧化锰 TNT 吸附 

分 类 号：X513[环境科学与工程—环境工程]