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Carbonized Waste Cation Exchange Resinwith Fe Doping for Persulfate Activationand Oxytetracycline Degradation:Performance and Mechanism
Summary
Researchers prepared a carbonized spent cation exchange resin doped with Fe3O4 (Fe3O4@CR) to activate persulfate for degrading the antibiotic oxytetracycline, achieving 76.4% removal under optimized conditions and identifying hydroxyl radicals and sulfate radicals as the primary reactive species responsible for degradation.
To resource utilization of the spent cation exchange resin, the carbonized resin with Fe doping (Fe 3 O 4 @CR) was prepared to activate persulfate (PS) for the degradation of oxytetracycline (OTC).Fe 3 O 4 @CR exhibited high catalytic potential for the degradation of OTC with relatively low activation energy (E a = 28.86 kJ/mol).In the Fe 3 O 4 @CR/PS system, 76.4% of the OTC was removed under the conditions ([PS]: 0.15 g/L, [Fe 3 O 4 @CR]: 0.3 g/L, T: 25ºC).Fe 3 O 4 @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 SO 4•-were the main radicals for the degradation of OTC.The conversion between Fe 3+ and Fe 2+ accelerated the degradation of OTC by generating • OH and SO 4•-.The possible degradation pathways were proposed.The OTC was mineralized to smaller molecules, such as C 14 H 10 O 3 and C 7 H 11 O.This study offers a new perspective on waste resin recycling and water purifi cation.
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