摘要
开发活性氧原位生成技术对Fenton氧化的实际应用具有重要意义。文章通过葡萄糖氧化酶与葡萄糖的反应可原位生成H_(2)O_(2),与共沉淀法制备的磁铁矿形成非均相Fenton体系,用于水中三氯乙烯(TCE)的氧化降解。研究了反应物剂量对TCE降解动力学的影响,结果显示,磁铁矿投加量为200 mg、葡萄糖浓度为2.5 mmol/L、葡萄糖氧化酶浓度为10 U/mL时TCE去除效果最佳,96 h时初始浓度为10 mg/L的水溶液中TCE去除率达到68.0%,且H_(2)O_(2)利用率远高于磁铁矿-H_(2)O_(2)体系。同时对反应体系中主要活性氧物种H_(2)O_(2)和羟基自由基·OH的原位生成进行了监测。通过酶反应生成的H_(2)O_(2)被磁铁矿完全分解,从而在96 h产生累积浓度约67.4μmol/L的·OH。活性氧淬灭实验结果表明,·OH是该体系中降解TCE的主要活性氧物质。
In-situ generation of reactive oxygen species(ROS)demonstrates significance for the practical application of Fenton oxidation.The reaction between glucose oxidase and glucose was used for the in-situ generation of H_(2)O_(2),which formed a heterogeneous Fenton system with magnetite particles prepared by coprecipitation and this system was used for the oxidative degradation of trichloroethene in water.The influences of reactant dosages on TCE degradation kinetics were studied and the results showed that the optimal removal efficiency was achieved at a magnetite dosage of 200 mg,a glucose concentration of 2.5 mmol/L and a glucose oxidase content of 10 U/mL,with a final TCE removal efficiency of 68.0%at 96 h from a TCE solution with initial concentration of 10 mg/L,while the H_(2)O_(2) utilization efficiency was much higher than the magnetite-H_(2)O_(2) Fenton system.Meanwhile,the in-situ generation of H_(2)O_(2) and hydroxyl radicals·OH in the reaction system were monitored.H_(2)O_(2) generated by glucose oxidase was decomposed completely by magnetite,resulting in generation of·OH with an accumulative concentration of 67.4μmol/L at 96 h.The ROS scavenging experiments verified that·OH was the ma⁃jor ROS responsible for TCE degradation in this system.
作者
王梦阳
黄瑶
刘慧
WANG Mengyang;HUANG Yao;LIU Hui(School of Environment Studies,China University of Geosciences,Wuhan 430078,China;State Key Laboratory of Biogeology and Environmental Geology,Wuhan 430078,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第6期124-129,共6页
Environmental Science & Technology
基金
湖北省自然科学基金(2020CFB460)。
