废水溶液化学组分对O3/H2O2降解TNT的影响

O3/H2O2作用功效是通过羟基自由基(.OH)反应实现的。水溶液的化学组分可能影响.OH的形成或寿命,即影响O3/H2O2作用功效。然而,目前研究多集中于单一化学组分,对多组分体系的研究鲜见报道。该文以三硝基甲苯(TNT)废水为例,选择HCO3-、HCOO-、Cu2+及A l3+等化学组分,以TNT去除率及反应速率常数的改变为评价指标,研究了废水溶液化学组分对O3/H2O2降解TNT功效影响的联合作用。结果表明,(1)废水溶液化学组分对O3/H2O2降解TNT功效的影响因组分种类而异,HCO3-、HCOO-、Cu2+对O3/H2O2作用功效具有抑制作用,A l3+具有促进作用;(2)不同组分间可以不同的联合作用方式影响O3/H2O2的作用功效,如HCO3-与HCOO-之间为协同作用,Cu2+与HCOO-之间为独立作用,A l3+与HCOO-之间可近似认为是相加作用。

Integrated Effect of Chemical Compositions on the Degradation of TNT by O3/H2O2 Process

The removal of objective pollutants by O_3/H_2O_2 process is via hydroxyl radical reaction.Chemical compositions of the water solution may influence the generation or(and) lifetime of the hydroxyl radicals,and therefore affect the efficacy of O_3/H_2O_2 process.In this paper,HCO~-_3,HCOO~-,Cu~(2+) and Al~(3+) were selected as the chemical compositions to study the integrated effect on the degradation of TNT by O_3/H_2O_2 process.The results showed that,(1)the effect of chemical composition on the degradation of TNT is controlled by its type:HCO~-_3,HCOO~-and Cu~(2+) inhibiting the efficacy of O_3/H_2O_2 process and Al~(3+) improving it;(2)there are different types of integrated effect of chemical compositions on O_3/H_2O_2 process,synergism for HCO~-_3 and HCOO~-,independent effect for Cu~(2+) and HCOO~-,and additive effect for Al~(3+) and HCOO~-.