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[1]李彦成,刘彦禧,刘叶芳,等.MnO2/CoFe2O4活化过一硫酸盐降解酸性大红3R[J].中国给水排水,2021,37(17):78-85.
　LI Yan-cheng,LIU Yan-xi,LIU Ye-fang,et al.Degradation of Acid Red 3R by MnO2/CoFe2O4 Activated Permonosulfate[J].China Water & Wastewater,2021,37(17):78-85.

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MnO₂/CoFe₂O₄活化过一硫酸盐降解酸性大红3R

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第37卷期数: 2021年第17期页码: 78-85 栏目: 出版日期: 2021-09-01

Title:: Degradation of Acid Red 3R by MnO₂/CoFe₂O₄ Activated Permonosulfate

作者:: 李彦成，刘彦禧，刘叶芳，黄雷，黄瑞敏; (华南理工大学环境与能源学院，广东广州510006)

Author(s):: LI Yan-cheng,LIU Yan-xi,LIU Ye-fang,HUANG Lei,HUANG Rui-min; (College of Environment and Energy, South China University of Technology, Guangzhou 510006, China)

关键词:: 铁酸钴; 二氧化锰; 过一硫酸盐; 酸性大红3R

Keywords:: cobalt ferrite; manganese dioxide; permonosulfate; acid red 3R

摘要:: 为解决CoFe₂O₄因团聚导致催化效率降低的问题，采用两步水热法制备了MnO₂/CoFe₂O₄(物质的量之比为5 ∶1)磁性纳米复合催化剂，利用XRD、XPS、SEM、BET等手段对催化剂进行表征，并研究了其活化过一硫酸盐(PMS)降解酸性大红3R(AR3R)的效果及其降解机理。结果表明，MnO₂的引入有效解决了CoFe₂O₄的团聚问题，同时利用≡Mn³⁺及≡Co³⁺之间的协同作用进一步提高了MnO₂对PMS的催化能力。当pH值为3、PMS和MnO₂/CoFe₂O₄投加量分别为1.25 mmol/L和0.3 g/L时，反应10 min后对AR3R（50 mg/L）的降解率为93.5%。自由基淬灭实验和对反应前后MnO₂/CoFe₂O₄的XPS表征结果表明，催化剂表面的≡Mn³⁺和≡Co²⁺均参与了电子传递过程，二者协同活化PMS产生的SO₄^-·和·OH主导了AR3R的降解。此外，催化剂循环利用实验结果表明，在5次重复使用后该催化剂仍能保持90%以上的催化降解率，具有很好的应用前景。

Abstract:: In order to solve the problem of low catalytic efficiency caused by agglomeration of CoFe₂O₄, MnO₂/CoFe₂O₄ (molar ratio was 5 ∶1) magnetic nanocomposite catalyst was prepared by two-step hydrothermal method. Then, the catalyst was characterized by XRD, XPS, SEM and BET, and degradation performance of acid red 3R (AR3R) by activated permonosulfate (PMS) and its degradation mechanism were investigated. Addition of MnO₂ effectively solved the problem of CoFe₂O₄ agglomeration, and further improved the activation performance of MnO₂ to PMS by using synergistic effect between ≡Mn³⁺ and ≡Co³⁺. When pH and dosages of PMS and MnO₂/CoFe₂O₄ were 3, 1.25 mmol/L and 0.3 g/L, the degradation rate of AR3R (50 mg/L) reached 93.5% after 10 min of reaction. Free radical quenching experiment and XPS characterization of MnO₂/CoFe₂O₄ before and after reaction indicated that both ≡Mn³⁺ and ≡Co²⁺ were involved in the electron transfer process, and SO₄^-·and ·OH produced by their synergistic activation of PMS dominated the degradation of AR3R. In addition, recycling experiment of the catalyst demonstrated that it could still maintain a catalytic degradation rate of more than 90% after 5 times of reuse, indicating that the catalyst has a good application prospect.

更新日期/Last Update: 2021-09-01