期刊
CHEMICAL ENGINEERING JOURNAL
卷 431, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.134026
关键词
Defect rich CuO; Layered MgO support; Oxygen vacancies; Peroxydisulfate; Electron transfer mechanism
资金
- Postdoctoral Research Foundation of China [2020M673356]
- Natural Science Foun-dation of Shaanxi Province [2021JQ-503]
- Natural Science Foundation of Shaanxi Provincial Department of Education [20JK0725]
Activated by layered MgO supported CuO nanoparticles, PDS can efficiently remove organic pollutants. The CuO/MgO hybrid catalysts show excellent catalytic performance and stability in wastewater remediation.
Heterogeneous activation of peroxydisulfate (PDS) by transition metal oxides offers a promising strategy for organic pollutants removal but suffers from low electron transfer efficiency. Herein, layered MgO supported CuO nanoparticles was prepared by thermal conversion of metal-phenolic networks of Cu2+/Mg2+ and tannic acid. CuO nanoparticles (~2 nm) were spatial monodispersed on layered MgO, inducing the formation of electron deficient Cu3+ and surface oxygen vacancies and thus facilitated adsorption and activation of PDS. The electron rich CuO/MgO hybrid catalysts manifested good catalytic performance of PDS activation for organic pollutants removal. At 0.18 g/L of CuO/MgO hybrid catalyst and 0.2 mM of PDS, complete removal of bisphenol A (BPA) was achieved with a high kinetic constant (0.1 min(-1), 50 min). Quenching experiments, electron paramagnetic resonance tests, PDS decomposition behaviors, electrochemical analysis and in situ ATR-FTIR and Raman spectroscopy revealed a nonradical pathway of electron transfer for PDS activation. The CuO/MgO hybrid catalysts exhibited wide working pH range from 3 to 11, selective oxidation capability, good resistance to halide ion and high utilization efficiency of PDS, and thus would be a promising candidate for wastewater remediation.
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