High-Efficient Elimination of Spiramycin by Fe 3 O 4 /ZSM-5/Sch via Heterogeneous Photo-Fenton Oxidation at Neutral pH

Jiali Yi, Junjun Xu (), Jiatong Liu, Yue Zheng and Qiong Wang
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Jiali Yi: College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, China
Junjun Xu: College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, China
Jiatong Liu: College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, China
Yue Zheng: School of Chemistry and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, China
Qiong Wang: College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, China

Sustainability, 2023, vol. 15, issue 16, 1-16

Abstract: Spiramycin (SPM), a widely employed antibiotic in both clinical therapy and the livestock industry, poses significant challenges in terms of safe and efficacious management. A heterogeneous photo-Fenton system, devised using Schwertmannite (Sch), can effectively degrade contaminants. However, it is accompanied by a relatively low conversion efficiency of ≡Fe 3+ /≡Fe 2+ and a significant iron loss. In this study, a catalyst featuring Fe 3 O 4 and ZSM-5 molecular sieve-modified Sch (Fe 3 O 4 /ZSM-5/Sch) was devised to enhance the catalytic activity and stability. The findings revealed that Fe 3 O 4 /ZSM-5/Sch exhibited exceptional catalytic activity, with the reaction first-order kinetic exceeding that of pure Sch. The active species including ·OH, h + , e − , ·O 2 − and SO 4 · − were identified in the UV/Fe 3 O 4 /ZSM-5/Sch-H 2 O 2 system. The enhanced catalytic activity of Fe 3 O 4 /ZSM-5/Sch could be ascribed to the effective conversion of ≡Fe 3+ /≡Fe 2+ . The photogenerated electrons within Fe 3 O 4 were transported to Sch via ZSM-5, which effectually reduced ≡Fe 3+ /≡Fe 2 . Moreover, Fe 3 O 4 /ZSM-5/Sch demonstrated outstanding stability; even after six cycles, the degradation efficiency of SPM remained above 86.50%, and the leaching quantity of Fe remained below 0.24 mg/L. This research not only develops an excellent catalyst for the safe treatment of SPM but also proffers innovative perspectives for the future design of efficient iron-based catalysts.

Keywords: schwertmannite; Fe 3 O 4; ZSM-5; photocatalytic mechanism; stability (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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