High-activity and excellent-reusability γ-Fe2O3/SiO2 coating on TC4 titanium alloy by plasma electrolytic oxidation for enhanced photo-Fenton degradation

Xiao Zhang; Qixing Xia; Yang Zhou; Yahui Wang; Zhaohua Jiang; Zhongping Yao

doi:10.1016/j.chemosphere.2022.135105

High-activity and excellent-reusability γ-Fe₂O₃/SiO₂ coating on TC4 titanium alloy by plasma electrolytic oxidation for enhanced photo-Fenton degradation

Chemosphere. 2022 Sep;303(Pt 2):135105. doi: 10.1016/j.chemosphere.2022.135105. Epub 2022 May 28.

Authors

Xiao Zhang¹, Qixing Xia², Yang Zhou¹, Yahui Wang³, Zhaohua Jiang¹, Zhongping Yao⁴

Affiliations

¹ School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150001, China.
² School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150001, China; Institute of Culture and Heritage, Northwestern Polytechnical University, Xi'an, 710000, China. Electronic address: xqixing@nwpu.edu.cn.
³ State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Hefei, 230037, China.
⁴ School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150001, China. Electronic address: yaozhongping@hit.edu.cn.

PMID: 35640682
DOI: 10.1016/j.chemosphere.2022.135105

Abstract

The immobilized coatings as a kind of promising Fenton-like catalysts with excellent performance and reusability for the efficient degradation of antibiotics and phenol under solar light irradiation is investigated. Herein, the porous γ-Fe₂O₃/SiO₂ immobilized ceramic coating on TC4 titanium alloy as photo-Fenton catalyst was prepared via plasma electrolytic oxidation technology. The as-obtained immobilized coating manifested a remarkable catalytic activity that the removal efficiencies of phenol and various antibiotics could reach more than 92% within 90 min, and presented excellent reusability after six runs in phenol removal. The high activity and excellent reusability of γ-Fe₂O₃ were attributed to the synergistic effect of multiple pathways to jointly produce abundant •OH, and the combination of γ-Fe₂O₃ and SiO₂ in the coating could effectively reduce iron leaching during the heterogeneous photo-Fenton process, respectively. This work provides a novel strategy for the synthesis of high-performance photo-Fenton catalysts to dispose of wastewater in the future.

Keywords: Antibiotics; Heterogeneous photo-fenton; Phenol; Plasma electrolytic oxidation; γ-Fe(2)O(3)/SiO(2) immobilized coating.

MeSH terms

Alloys
Anti-Bacterial Agents
Catalysis
Hydrogen Peroxide
Phenol
Silicon Dioxide*
Titanium*

Substances

Alloys
Anti-Bacterial Agents
Phenol
Silicon Dioxide
Hydrogen Peroxide
Titanium