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Glucose oxidase modified Fenton reactions for in-situ ROS generation and potential application in groundwater remediation.
Chemosphere ( IF 8.1 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.chemosphere.2020.126648
Yao Huang 1 , Hui Liu 2 , Shan Liu 1 , Cui Li 1 , Songhu Yuan 3
Affiliation  

Catalyzed H2O2 propagations (CHP) have demonstrated great potential in the remediation of chlorinated aliphatic hydrocarbons (CAHs) like trichloroethene (TCE) contaminated groundwater. However, the importation of highly unstable H2O2 into subsurface environment remains challenging. In this work, the in-situ H2O2 generation reaction between glucose oxidase (GOD) and glucose was applied in combination with Fe(II) to form the modified Fenton system (GMFs) and its performance in TCE oxidative degradation was investigated. The influence of reactant concentration as well as environmental factors like temperature and pH on the kinetics of TCE oxidation in GMFs were studied. At optimized conditions, about 78% TCE were removed within 8 h in GMFs, which remained effective over the temperature range of 15-30 °C and pH range of 3.6-6.0 (in acetate buffer). The in-situ H2O2 and OH generation capacity of GMFs were further investigated to elucidate their functional mechanism on TCE oxidation. Intermediate and product analysis indicated the near-complete release of chloride ion by TCE oxidation with few organic chlorinated intermediates detected. This work reveals the potential of GMFs for CAHs contaminated groundwater remediation through in-situ generation of reactive oxygen species.

中文翻译:

葡萄糖氧化酶修饰的Fenton反应用于原位ROS的产生和在地下水修复中的潜在应用。

催化的H2O2繁殖(CHP)在补救像三氯乙烯(TCE)污染的地下水这样的氯化脂肪族烃(CAH)方面已显示出巨大的潜力。但是,将高度不稳定的H2O2导入地下环境仍然具有挑战性。在这项工作中,葡萄糖氧化酶(GOD)和葡萄糖之间的原位H2O2生成反应与Fe(II)结合使用以形成修饰的Fenton系统(GMFs),并研究了其在TCE氧化降解中的性能。研究了反应物浓度以及温度和pH等环境因素对GMF中TCE氧化动力学的影响。在优化的条件下,在GMF中在8小时内去除了约78%的三氯乙酸,在15-30°C的温度范围和3.6-6.0的pH范围内(在醋酸盐缓冲液中)仍然有效。进一步研究了GMF的原位H2O2和OH生成能力,以阐明它们对TCE氧化的作用机理。中间体和产物分析表明,TCE氧化几乎完全释放了氯离子,几乎没有检测到有机氯化中间体。这项工作揭示了GMF通过原位产生活性氧来修复CAHs污染地下水的潜力。
更新日期:2020-04-01
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