Carbonized Waste Cation Exchange Resin with Fe Doping for Persulfate Activation and Oxytetracycline Degradation: Performance and Mechanism
Kun Yang 1,2
Qiang Li 1,2
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School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, PR China
Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430073, China
Institute of Spatial Planning of Hubei Province, Wuhan, 430064, China
Submission date: 2023-03-15
Final revision date: 2023-04-11
Acceptance date: 2023-05-15
Online publication date: 2023-06-19
Publication date: 2023-07-21
Corresponding author
Qiang Li   

Wuhan Textile University, China
Pol. J. Environ. Stud. 2023;32(4):3883-3893
To resource utilization of the spent cation exchange resin, the carbonized resin with Fe doping (Fe3O4@CR) was prepared to activate persulfate (PS) for the degradation of oxytetracycline (OTC). Fe3O4@CR exhibited high catalytic potential for the degradation of OTC with relatively low activation energy (Ea = 28.86 kJ/mol). In the Fe3O4@CR/PS system, 76.4% of the OTC was removed under the conditions ([PS]: 0.15 g/L, [Fe3O4@CR]: 0.3 g/L, T: 25ºC). Fe3O4@CR could work effectively for activating PS to degrade OTC in the pH range of 3.0-7.0. The free radical quenching experiments and electron paramagnetic resonance (EPR) analysis showed that OH and SO4•- were the main radicals for the degradation of OTC. The conversion between Fe3+ and Fe2+ accelerated the degradation of OTC by generating OH and SO4•-. The possible degradation pathways were proposed. The OTC was mineralized to smaller molecules, such as C14H10O3 and C7H11O. This study offers a new perspective on waste resin recycling and water purification.
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