Photo-Fenton degradation of carbamazepine and ibuprofen by iron-based metal-organic framework under alkaline condition

Siyu Sun; Youyou Hu; Mengshan Xu; Fan Cheng; Hui Zhang; Zhengkui Li

doi:10.1016/j.jhazmat.2021.127698

Photo-Fenton degradation of carbamazepine and ibuprofen by iron-based metal-organic framework under alkaline condition

J Hazard Mater. 2022 Feb 15;424(Pt C):127698. doi: 10.1016/j.jhazmat.2021.127698. Epub 2021 Nov 8.

Authors

Siyu Sun¹, Youyou Hu¹, Mengshan Xu¹, Fan Cheng¹, Hui Zhang¹, Zhengkui Li²

Affiliations

¹ State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210023, China; School of the Environment, Nanjing University, Nanjing 210023, China.
² State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210023, China; School of the Environment, Nanjing University, Nanjing 210023, China. Electronic address: zhkuili@nju.edu.cn.

PMID: 34775313
DOI: 10.1016/j.jhazmat.2021.127698

Abstract

Metal-organic frameworks have been widely used as photocatalytic materials. In this paper, a novel photocatalyst HSO₃-MIL-53(Fe) with acidity regulating groups was successfully synthesized by the solvothermal method and applied to remove carbamazepine (CBZ) and ibuprofen (IBP). The photodegradation efficiency of vis/H₂O₂/HSO₃-MIL-53(Fe) can reach 100% when the pH value is 8 or 9. The free radical capture experiment and electron paramagnetic resonance analysis proved that hole (h⁺), hydroxide radical (·OH), singlet oxygen (¹O₂), and superoxide Radical (·O₂^-) are the main active species for pollutants degradation. In the vis/H₂O₂/HSO₃-MIL-53(Fe) system, the high pollutant degradation efficiency under alkaline conditions was attributed to two factors: (1) the acidity adjusting group -HSO₃ adjusts the pH value of the whole system, which is beneficial to the photo-Fenton process. (2) The photogenerated electrons of HSO₃-MIL-53(Fe) can be captured by Fe (III), H₂O₂ and O₂ to accelerate the reduction of Fe (III) and generate ·OH, ¹O₂, and ·O₂^-. Besides, H₂O₂ can also be activated by Fe (II) and Fe (III). The above processes synergistically improved the photocatalytic efficiency. Based on liquid chromatography-mass spectrometry (LC-MS) analysis, the possible degradation pathways of the two pollutants were proposed.

Keywords: Acid microenvironment; Carbamazepine; HSO(3)-MIL-53(Fe); Ibuprofen; Photocatalyst.

Publication types

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

MeSH terms

Carbamazepine
Hydrogen Peroxide
Ibuprofen
Iron
Metal-Organic Frameworks*

Substances

Metal-Organic Frameworks
Carbamazepine
Hydrogen Peroxide
Iron
Ibuprofen