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Degradation of Rhodamine B by highly active Cu-MnO2 oxidase-like enzymes
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Affiliation:

1.Guangxi Key Laboratory of Petrochemical Resource Processing and Engineering Enhancement Technology, School of Chemistry and Chemical Engineering, Guangxi University;2.Guangxi University Key Laboratory of Petrochemical Resource Processing and Engineering Enhancement Technology, School of Chemistry and Chemical Engineering;3.Guangxi Bossco Environmental Technology Co., Ltd

Clc Number:

X524

Fund Project:

National Natural Science Foundation of China (52162004); Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology Director Project (2020Z003); Guangxi Bosch Science Industry-University-Research Cooperation Project (20210014)

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    Abstract:

    Nanozymes have attracted much attention in the field of environmental remediation due to their excellent catalytic activity. Elemental doping can improve the catalytic performance of nanozymes. A highly active copper-doped manganese dioxide(Cu-MnO2) oxidase-like nanozyme(referred to oxidase-like enzyme) was prepared by a one-step hydrothermal method, and its degradation of rhodamine B (RhB) dye was investigated. It has been shown that the catalytic activity of Cu-MnO2 is enhanced by the synergistic effect of Cu-MnO2 upon copper doping. With a solution pH of 3, an initial mass concentration of RhB of 50 mg/L, and a dose Cu-MnO2 dosage of 0.01 g, RhB was fully degraded within 30 min, and the degradation rate of RhB was still 75% after 5 times the catalyst used. In addition, the degradation rates of ciprofloxacin, ofloxacin, tetracycline, and hydroquinone were 88.86%, 90.47%, 92.62% and 90.99%, respectively. The mechanism of catalytic degradation of RhB by Cu-MnO2 oxidase-like enzyme showed that there were abundant holes (h+) in Cu-MnO2 rich in oxygen vacancies, which was beneficial for adsorbing and catalyzing dissolved oxygen to produce a large amount of singlet oxygen (1O2) and a small number of superoxide radicals (O2·-) and other reactive oxygen species for the rapid degradation of organic pollutants.

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History
  • Received:February 15,2023
  • Revised:May 14,2023
  • Adopted:May 18,2023
  • Online: December 11,2023
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