O3/H2O2降解水中扑灭通效能研究

利用拟一级降解速率常数表征O3/H2O2对扑灭通(Prometon)的氧化效能,探讨了n(H2O2)/n(O3)、pH值、水质和碳酸氢根离子对去除的影响,对有机氧化产物进行了气相和液相质谱分析,以离子色谱法测定了反应过程中产生的NO3-,在此基础上对扑灭通降解途径进行了研究.结果表明,扑灭通初始浓度2 mg.L-1,反应温度25℃,O3投量13 mg.L-1时,最佳反应条件为n(H2O2)/n(O3)=0.7,体系pH为7～8;扑灭通在自来水中的去除效果好于纯水;HCO3-浓度>50 mg.L-1时,对扑灭通的氧化有明显的抑制作用.液质和气质的分析结果表明扑灭通并未开环,氧化过程中扑灭通三嗪环支链上的2个异丙基首先被氧化脱去,离子色谱检测到的NO3-是三嗪环支链胺基氧化的产物.

Degradation of Prometon by O3/H2O2

The removal efficiency of Prometon degraded by O3/H2O2 advanced oxidation process (AOP) was represented by the pseudo-first-rate order to discuss the effect of n(H2O2)/n(O3), pH, water quality and HCO-. The organic products were characterized by GC/MS and LC/MS and NO3- produced during degradation was determined by IC, on the basis of which the degradation path of Prometon was also investigated. The result indicated that when concentration of Prometon was 2 mg x L(-1), dosage of ozone was 13 mg x L(-1), the reactive temperature was 25 degrees C, the optimal condition of degradation was as follows, n(H2O2)/n (O3 ) = 0.7, pH 7-8; The micro inorganic and organic substances in tap water promoted the removal rate of the Prometon comparing to that in pure water, and HCO3- showed inhibition effect on degradation. The results of GC/MS and LC/MS suggested that the triazine ring of Prometon was not destroyed during the AOP, the two isopropyl of triazine ring were disengaged firstly, and the NO3- detected by IC might be the oxidation product of the amido of the triazine ring.