掺硼金刚石电极降解模拟焦化废水中的喹啉

采用掺硼金刚石（BDD）电极电化学氧化法降解模拟焦化废水中的喹啉，并通过GC-MS技术分析了喹啉的降解机理及途径。实验结果表明：在常温、初始喹啉质量浓度为50.0 mg/L、电解质Na₂SO₄浓度为0.05 mol/L、模拟废水pH为7、电解时间为2.5 h、电流密度为30 mA/cm²、极板总面积与模拟废水体积的比为160 cm²/cm³的条件下，喹啉降解率接近100%;TOC由初始时的29.43 mg/L降至5.76 mg/L，TOC去除率达80%;COD由初始时的95.25 mg/L降至20.65 mg/L，COD去除率达78%;在降解过程中，首先在喹啉苯环的5位和8位发生羟基化反应，然后苯环发生断裂，形成带有吡啶环的中间产物及羧酸类产物，最后氮杂环开环，生成二氧化碳和水。

Degradation of Quinoline in Simulated Coking Wastewater Using BDD Electrode

Quinoline in the simulated coking wastewater was degraded by the electrochemical oxidation method using boron-doped diamond (BDD) electrode. And the degradation mechanism and pathways were also analyzed by GC-MS. The experimental results show that：Under the conditions of room temperature,initial quinoline mass concentration 50.0 mg/L,Na₂SO₄ concentration 0.05 mol/L,wastewater pH 7, electrolysis time 2.5 h,current density 30 mA/cm² and ratio of total electrode area to wastewater volume 160 cm²/cm³,the degradation rate of quinoline is near to 100%,the TOC is decreased from 29.43 mg/L to 5.76 mg/L with 80% of removal rate,the COD is declined from 95.25 mg/L to 20.65 mg/L with 78% of removal rate;During the degradation process,the hydroxylation reaction on the 5 and 8 sites of quinoline benzene ring is occurred at first,and then the benzene ring is broken to form intermediate products with pyridine ring and carboxylic acid,and finally the nitrogen heterocyclic ring is opened to generate carbon dioxide and water.