水中本底成分对催化臭氧化分解微量硝基苯的影响

考察了水中本底成分对催化臭氧化分解水中微量硝基苯的影响规律.对比试验结果表明,单独臭氧氧化、臭氧/蜂窝陶瓷催化氧化和臭氧/改性蜂窝陶瓷催化氧化工艺在自来水中比蒸馏水中对硝基苯的去除率分别增加了4.90%、2.47%和5.12%.单独臭氧氧化对硝基苯的分解效率随着镁离子浓度的升高(0～8 mg.L^-1)而增加了6.25%,在相同实验条件下,臭氧/蜂窝陶瓷催化氧化和臭氧/改性蜂窝陶瓷催化氧化对硝基苯的降解效率随着镁离子浓度的升高却降低了11.41%和17.64%;单独臭氧氧化、臭氧/蜂窝陶瓷催化氧化和臭氧/改性蜂窝陶瓷催化氧化在氯离子浓度增加(0～40 mg.L^-1)的情况下对硝基苯的去除率分别下降了4.42%、9.38%和12.24%;低浓度的腐殖酸促进了硝基苯的降解,高浓度的腐殖酸抑制了硝基苯的降解.实验还研究了臭氧投加量和硝基苯初始浓度对硝基苯降解效率的影响.

'Effect of Background Constituents on the Degradation of Trace Nitrobenzene in Aqueous Solution by Catalytic Ozonation

Effect of background constituents on the catalytic ozonation of nitrobenzene was investigated. Degradation rates of ozonation alone, ceramic honeycomb and modified ceramic honeycomb-catalyzed ozonation in tap water increased by 4.90%, 2.47% and 5.12% than those in distilled water respectively. The removal rate of ozonation alone increased by 6.25% with the increase of the concentration of magnesium ion (0 to approximately 8 x mg x L(-1)), but those of other two processes decreased by 11.41% and 17.64%, respectively, under the same experimental condition. Degradation efficiency of ozonation alone, ceramic honeycomb and modified ceramic honeycomb-catalyzed ozonation decreased by 4.42%, 9.38% and 12.24%, respectively, with the increase of the concentration of chloride ion (0 to approximately 40 mg x L(-1)). At the lower concentration, humic acid could accelerate the degradation of nitrobenzene, however, the reaction was retarded at higher concentrations of humic acid. The experiment also studied the influences of the applied ozone and initial concentration of nitrobenzene.