Amino-functionalized MIL-88B as heterogeneous photo-Fenton catalysts for enhancing tris-(2-chloroisopropyl) phosphate (TCPP) degradation: Dual excitation pathways accelerate the conversion of FeIII to FeII under visible light irradiation

Hang Liu; Hua Yin; Xiaolong Yu; Minghan Zhu; Zhi Dang

doi:10.1016/j.jhazmat.2021.127782

Amino-functionalized MIL-88B as heterogeneous photo-Fenton catalysts for enhancing tris-(2-chloroisopropyl) phosphate (TCPP) degradation: Dual excitation pathways accelerate the conversion of Fe^III to Fe^II under visible light irradiation

J Hazard Mater. 2022 Mar 5:425:127782. doi: 10.1016/j.jhazmat.2021.127782. Epub 2021 Nov 17.

Authors

Hang Liu¹, Hua Yin², Xiaolong Yu³, Minghan Zhu¹, Zhi Dang¹

Affiliations

¹ Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China.
² Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China. Electronic address: huayin@scut.edu.cn.
³ Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China.

PMID: 34810008
DOI: 10.1016/j.jhazmat.2021.127782

Abstract

In this work, the amino-functionalized metal-organic frameworks (MIL-88B-NH₂) was synthesized, characterized and used as heterogeneous photo-Fenton catalyst for tris-(2-chloroisopropyl) phosphate (TCPP) degradation. The photo-Fenton activity of MIL-88B-NH₂ was investigated on the basis of influence factors, such as initial pH and TCPP concentration, and coexisting impurities. The results revealed that MIL-88B-NH₂+H₂O₂+Vis system exhibited a satisfactory degradation efficiency of TCPP (almost 100%) within 60 min accompanied by a good reusability. Noticeably, the degradation kinetics constant of TCPP by MIL-88B-NH₂+H₂O₂+Vis system was 0.086 min^-1, which was visibly higher than that of MIL-88B+H₂O₂+Vis system (0.021 min^-1) since the addition of amino-functionalized organic linker inhibiting the recombination rate of the photo-generated electron-hole pairs and improving the visible light response. Combined with the characterization, the conversion of Fe^III to Fe^II could be accelerated by the photo-generated electron from the excitation of Fe-O clusters and NH₂ functionalities, which strengthened the decomposition of H₂O₂ and formed plenty •OH. Simultaneously, six steady products were validated and potential degradation pathways of TCPP were proposed. It was anticipated that MIL-88B-NH₂ could be considered as a desirable and alternative candidate in the application of heterogeneous photo-Fenton reaction to control the environmental risks caused by organophosphate flame retardants (OPFRs).

Keywords: Fe-O clusters; Heterogeneous photo-Fenton; MIL-88B-NH(2); NH(2) functionalities; Tris-(2-chloroisopropyl) phosphate.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Ferric Compounds*
Ferrous Compounds
Hydrogen Peroxide*
Light
Organophosphates
Phosphates

Substances

Ferric Compounds
Ferrous Compounds
Hydrogen Peroxide
Organophosphates
Phosphates
tri-(2-chloroisopropyl)phosphate