Construction of highly dispersed iron active sites for efficient catalytic ozonation of bisphenol A

Minxian Zhang; Shiqi Huang; Wencong Liu; Jingling Yang; Mingshan Zhu; Shih-Hsin Ho

doi:10.1016/j.chemosphere.2023.140322

Construction of highly dispersed iron active sites for efficient catalytic ozonation of bisphenol A

Chemosphere. 2023 Dec:344:140322. doi: 10.1016/j.chemosphere.2023.140322. Epub 2023 Sep 27.

Authors

Minxian Zhang¹, Shiqi Huang², Wencong Liu¹, Jingling Yang³, Mingshan Zhu¹, Shih-Hsin Ho⁴

Affiliations

¹ Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou, 511443, PR China.
² School of Environmental and Chemical Engineering, Foshan University, Foshan, 528225, PR China.
³ Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou, 511443, PR China. Electronic address: yangjl@jnu.edu.cn.
⁴ State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150040, PR China. Electronic address: stephen6949@hit.edu.cn.

PMID: 37775059
DOI: 10.1016/j.chemosphere.2023.140322

Abstract

The essential factor of catalytic ozonation technology relies on an efficient and stable catalyst. The construction of highly dispersed active sites on heterogeneous catalysts is an ideal strategy to combine the merits of homogeneous and heterogeneous catalysis with high activity and stability. Herein, an iron-containing mesoporous silica material (Fe-SBA15) with sufficient iron site exposure and enhanced intrinsic activity of active sites was employed to activate ozone for bisphenol A (BPA) degradation. Approximately 100% of BPA and 36.6% of total organic carbon (TOC) removal were realized by the Fe-SBA15 catalytic ozonation strategy with a reaction constant of 0.076 min^-1, well beyond the performance of FeO_x/SBA15 mixture and Fe₂O₃. Radical quenching experiments and electron paramagnetic resonance (EPR) analysis demonstrated that the hydroxyl radicals (HO^•) and superoxide radicals (O₂^•-) played an important role in the degradation process. The iron sites with recyclable Fe(III)/Fe(II) pairs act as both the electron donors and active sites for catalytic ozonation. The mesoporous framework of SBA15 in Fe-SBA15 stabilizes the iron sites that enhance its stability. With high catalytic performance and high reusability for catalytic ozonation of BPA, the Fe-SBA15 is expected to be a promising catalyst in catalytic ozonation for wastewater treatment.

Keywords: Bisphenol A removal; Heterogeneous catalytic ozonation; Iron species; Mesoporous silica materials.

MeSH terms

Catalysis
Catalytic Domain
Iron / chemistry
Ozone* / chemistry
Water Pollutants, Chemical* / analysis

Substances

bisphenol A
Iron
Ozone
Water Pollutants, Chemical