Journal of Inorganic Materials ›› 2023, Vol. 38 ›› Issue (4): 469-476.DOI: 10.15541/jim20220591

• RESEARCH LETTER • Previous Articles    

Enhanced Degradation of Methyl Orange with CoFe2O4@Zeolite Catalyst as Peroxymonosulfate Activator: Performance and Mechanism

WANG Lei1(), LI Jianjun1,2(), NING Jun3, HU Tianyu1,2, WANG Hongyang1, ZHANG Zhanqun1, WU Linxin1   

  1. 1. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
    2. Institute of Environment-friendly Materials and Occupational Health, Anhui University of Science and Technology, Wuhu 241000, China
    3. Anhui Shuiyun Environmental Protection Co., Ltd., Wuhu 241000, China
  • Received:2022-10-09 Revised:2022-11-27 Published:2023-04-20 Online:2022-12-30
  • Contact: LI Jianjun, professor. E-mail: ljj.hero@126.com
  • About author:WANG Lei (1998-), male, Master candidate. E-mail: wangleidreamer@126.com
  • Supported by:
    Natural Science Foundation of Anhui Province(1908085ME127);Research Foundation of the Institute of Environment-friendly Materials and Occupational Health(Wuhu);Anhui University of Science and Technology(ALW2021YF11)

Abstract:

CoFe2O4@zeolite (CFZ) was prepared by using a co-precipitation hydrothermal method and used for synthetic dyes degradation by activating peroxymonosulfate (PMS). Comprehensive characterizations suggest that CoFe2O4 nanoparticles composing porous shell layer is uniformly covered on Na-A zeolite. The specific surface area of CFZ is 107.06 m2/g, three times that of the original zeolite. Since CFZ has a saturation magnetization of 29.0 A·m2·kg-1, it could be separated efficiently by magnetic separation. Catalytic degradation experiments indicate that the removal of methyl orange (MO) in the CFZ/PMS system is much higher than that using CFZ or PMS alone. Under the optimum condition ([MO]=50 mg/L, [PMS]=1.0 mmol/L, 0.2 g/L CFZ, pH 8 and T=25 ℃), MO removal efficiency is up to 97.1%. Effect of various factors, including pH, PMS and CFZ dosage, MO concentration and presence of coexisting anions, on the catalytic performance of CFZ is carefully studied. Reactive oxygen species quenching experiments suggest that 1O2 and O2•- play a dominant role in the degradation process. CFZ shows excellent recycling performance that the MO removal is declined by only 2.4% after 5 cycles. Catalytic degradation mechanism of the CFZ/PMS system is explored in detail.

Key words: advanced oxidation processe, peroxymonosulfate activation, magnetic catalyst, CoFe2O4@Zeolite, reactive oxygen species, degradation

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