2024年 04期

摘要(Abstract)：

为了解决单一氧化体系降解地下水中三氯乙烯的效率不高的问题，采用柠檬酸螯合Fe~(2+)催化过碳酸钠与过硫酸钠协同降解地下水中的三氯乙烯，考察过碳酸钠和过硫酸钠的配比、水质条件(pH、典型阴离子)以及三氯乙烯的初始浓度对三氯乙烯降解效率的影响。结果表明，当三氯乙烯的初始浓度为0.16 mmol/L时，在中性条件下，柠檬酸螯合Fe~(2+)催化过碳酸钠-过硫酸钠双氧化体系可以显著提高地下水中三氯乙烯的降解速率；三氯乙烯的降解受过碳酸钠与过硫酸钠的配比的影响，过碳酸钠、过硫酸钠、柠檬酸、 Fe~(2+)、三氯乙烯的物质的量比为10∶8∶5∶10∶1时，反应180 min后三氯乙烯的降解率为98.5%;随着反应体系pH增大，三氯乙烯的降解率逐渐降低；地下水中常见的阴离子SO_4~(2-)、 NO~-_3对该双氧化体系去除地下水中三氯乙烯的影响较小，但较高浓度的HCO~-_3、 Cl~-显著抑制三氯乙烯的降解；自由基清扫实验确定双氧化体系中存在氢氧自由基HO·、硫酸根自由基SO~-_4·、超氧自由基O~-_2·等自由基，且HO·对三氯乙烯的降解起主导作用。

关键词(KeyWords)： 地下水修复;三氯乙烯;原位化学氧化技术;双氧化体系

基金项目(Foundation): 山东省自然科学基金项目(ZR2021ME142)

作者(Author): 孙先峰,王晓东,冯岩,赵立信

DOI: 10.13349/j.cnki.jdxbn.20240620.001

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