Abstract: In order to study the removal and degradation mechanism of quinoline in catalytic wet peroxide oxidation (CWPO) system, a series of experiments were conducted over CuO-FeO_x/γ-Al₂O₃ catalyst. The influence of reaction temperature, initial pH, dosage of H₂O₂ and amount of catalyst were investigated, and the role of and degradation pathways of quinoline were analyzed. CWPO had good removal efficiency for quinoline. A complete quinoline conversion and 88.34% total organic carbon (TOC) removal were achieved in 60 min with initial pH of 7, 29.15 mmol·L^-1 of H₂O₂ and 4 g·L^-1 of catalyst at 80℃.·OHoxidation played a dominant role in quinoline degradation in CWPO system, and its average production rate was 1.69×10^-6 mmol·L^-1·min^-1. Under neutral and acidic conditions, quinoline degradation in CWPO system followed different pathways, and generated pyridine-based or benzene-based intermediate products.

Key words: catalytic wet peroxide oxidation, quinoline, catalyst, radical, degradation

摘要： 采用浸渍法制备了负载型铜铁氧化物催化剂,并以喹啉为目标污染物,建立了湿式过氧化氢催化氧化(CWPO)体系.研究了反应温度、初始pH、H₂O₂和催化剂投加量对喹啉去除效果的影响,并分析了CWPO体系中 的作用及喹啉的降解路径.结果表明,CWPO对喹啉具有很好的去除效果,反应30 min喹啉的去除率可达到100%,反应60 min矿化率可达到88.34%.确定了最佳反应温度为80℃,初始pH为7,H₂O₂和催化剂投加量分别为29.15 mmol·L^-1和4 g·L^-1. 氧化在CWPO降解喹啉体系中起主导作用,其平均产生速率为1.69×10^-6 mmol·L^-1·min^-1.推测了CWPO降解喹啉的4种可能路径,在中性和酸性条件下,分别生成以吡啶环或苯环为主的中间产物.

关键词: 湿式过氧化氢催化氧化, 喹啉, 催化剂, 自由基, 降解