Issue 1, 2023

Sequencing batch photocatalytic H2O2 production over a magnetic resorcinol–formaldehyde polymer for on-site water purification by UV light irradiation

Abstract

A self-maintainable decentralized water treatment system is appealing, while avoiding chemical addition is the prerequisite to realize it. As a widely used chemical in advanced oxidation processes (AOPs), H2O2 can be produced via photocatalysis. However, there remain challenges to use the photocatalytically produced H2O2 for water purification in a continuous operation, which requires that the produced H2O2 solution has no impurity and the catalyst powder is easily separable. We realized this by photocatalytic H2O2 production over magnetic separable photocatalytic microspheres through a sequencing batch process and coupling with ultraviolet C (UVC)/H2O2 for micropollutant removal via a flow-through operation. The photocatalysts were synthesized by in situ growth of a resorcinol–formaldehyde (RF) copolymer on Fe3O4@SiO2 microspheres, which can convert earth-abundant water and air into H2O2 under visible light irradiation. A clean H2O2 solution was produced at 100 μmol h−1 g−1 over magnetic photocatalysts and separated by using an external magnetic field. The on-site utilization of the obtained H2O2 solution was realized via UV light irradiation. This work provides a rational design of easily separable photocatalysts for H2O2 production, and offers insights for development of water purification processes with zero chemical addition and maintenance.

Graphical abstract: Sequencing batch photocatalytic H2O2 production over a magnetic resorcinol–formaldehyde polymer for on-site water purification by UV light irradiation

Supplementary files

Article information

Article type
Paper
Submitted
25 sen 2022
Accepted
27 okt 2022
First published
28 okt 2022
This article is Open Access
Creative Commons BY-NC license

Environ. Sci.: Adv., 2023,2, 98-106

Sequencing batch photocatalytic H2O2 production over a magnetic resorcinol–formaldehyde polymer for on-site water purification by UV light irradiation

J. Zhang, Q. Zheng, C. Chen, X. Zhang, X. Guo and M. Long, Environ. Sci.: Adv., 2023, 2, 98 DOI: 10.1039/D2VA00228K

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