Journal of Guangxi Normal University(Natural Science Edition) ›› 2024, Vol. 42 ›› Issue (1): 156-167.doi: 10.16088/j.issn.1001-6600.2023050807

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Preparation of S-CuCo2O4 Composite Catalysts and Study on Its Performance of Activating Peroxymonosulfate to Degrade Ciprofloxacin

ZHANG Mengyang1, HOU Dongrui1, LUO Jing2, SUN Qinggong2, YANG Hao1, WANG Jianfeng1*   

  1. 1. School of Ecology and Environment, Zhengzhou University, Zhengzhou Henan 450001, China;
    2. School of Chemical Engineering, Zhengzhou University, Zhengzhou Henan 450001, China
  • Received:2023-05-08 Revised:2023-05-18 Online:2024-01-25 Published:2024-01-19

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Abstract: S-CuCo2O4 was prepared by using thiourea as sulfur source to vulcanize CuCo2O4 via a simple hydrothermal method. The composite catalyst S-CuCo2O4 was characterized by XRD, FT-IR, SEM, XPS, ICP-OES and EPR, and the degradation effect of ciprofloxacin by activating PMS was investigated. The experimental results showed that S-CuCo2O4 catalyst has been prepared successfully, and its surface is rich in Co(Ⅱ) and Cu(Ⅰ); when the dosage of catalyst was 0.06 g/L, the dosage of PMS was 0.2 g/L and pH was 6.4, the S-CuCo2O4 showed superior behavior for degradation of ciprofloxacin with the efficiency as high as 96.8% in 25 min, better than that of CuCo2O4 and CuCo2S4. Finally, it was proved that SO-4· and 1O2 were the main reactive oxygen species in the reaction system by free radical quenching experiment and EPR test. The possible catalytic mechanism is as follows: Cu(Ⅰ) and Co(Ⅱ) can react directly with persulfate (PMS) to form free radicals, and Cu(Ⅰ) can reduce Co(Ⅲ) to form Co(Ⅱ), promoting the Co(Ⅱ)/Co(Ⅲ) cycle,the oxygen vacancies on the catalyst surface can also react with PMS to form 1O2, and ciprofloxacin can be efficiently degraded under the joint action of reactive oxygen species. The degradation efficiency of the compound catalyst S-CuCo2O4 for ciprofloxacin was still up to 93.5% after four cycles, which proved that the cyclic stability was good. It also has good degradation efficiency for other pollutants, and excellent generality, suggesting its potential in wastewater treatment.

Key words: ciprofloxacin, peroxymonosulfate, activation, degradition, heterogeneous catalyst, CuCo2O4, sulfuration

CLC Number:  X703;TQ426
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