Fe (II)活化过硫酸盐处理喹啉工艺参数优化及生物毒性

以喹啉为处理目标物，采用Fe²⁺活化K₂S₂O₈（PS）的高级氧化体系在不同环境因素下降解喹啉.结果表明：与单一PS体系和Fe²⁺体系相比，Fe²⁺/PS体系可以有效降解喹啉.在初始喹啉浓度为250mg/L，喹啉/PS物质的量比为1：10，PS/Fe²⁺物质的量比为3，初始pH3，反应温度为45℃，反应时间为80min的条件下，喹啉降解率可达100%.提高PS和Fe²⁺浓度均能有效提高喹啉降解率，但超过一定限值后对喹啉去除效果不明显.Fe²⁺/PS去除喹啉的过程符合一级反应动力学.溶液初始pH值越高，喹啉去除率越低；反应温度越高，喹啉去除率越高.自由基淬灭实验证实，Fe²⁺活化PS体系中有SO₄^-·和OH·的存在，其中由SO₄^-·产生的OH·对喹啉的降解占主导地位.通过GC/MS检测到2种中间产物8-羟基喹啉和2（1H）-喹啉酮，据此推测基于硫酸根自由基强化喹啉降解的可能路径.大肠杆菌急性毒性实验结果证实，虽然Fe²⁺/PS体系去除喹啉过程中产生了毒性更强的中间产物，但酸性条件和较高的反应温度有利于体系脱毒.

Accelerated quinoline removal by Fe(II)-activated persulfate: parameters optimization and biological detoxification analysis

This study investigated the degradation of quinoline in the sulfate radical (SO₄^-·)-based advanced oxidation system introducing by Fe²⁺-activated persulfate (K₂S₂O₈, PS). The Fe²⁺/PS system effectively degraded quinoline compared with the sole PS and Fe²⁺ system. Optimal operation parameters were comprehensively evaluated, specifically, when the initial quinoline concentration was 250mg/L, the optimal quinoline/PS molar ratio, Fe²⁺/PS molar ratio, initial pH, reaction temperature and time were 1:10, 3:1, 3, 45℃ and 80min, respectively, the quinoline degradation rate reached to 100%. Increasing the concentrations of PS and Fe²⁺effectively improved the degradation rate of quinoline, but the effect on quinoline removal was not significant till exceeding a certain limit. The degradation rate increased with the increase of reaction temperature, meanwhile, the acidic condition more suitable for its removal. Moreover, the degradation reaction kinetics, introduced by Fe²⁺/PS oxidation, fit the first-order reaction. Free radical quenching experiments confirmed the existence of SO₄^-·, OH·and other reactive oxygen radicals in the system, in which OH·was dominant in the degradation of quinoline. Two intermediates, 8-hydroxyquinoline and 2(1H)-quinolinone, were detected by GC/MS, from which two pathways for quinoline degradation were inferred. Results of E.coli acute toxicity showed that although more toxic intermediate products may be produced during the removal of quinoline by Fe²⁺/PS system, the acidic conditions and higher reaction temperature accelerated the detoxification of the treatment system.