Synthesis of adjustable {312}/{004} facet heterojunction MWCNTs/Bi5O7I photocatalyst for ofloxacin degradation: Novel insights into the charge carriers transport

Peng Gao; Shaojiang Huang; Kang Tao; Zexin Li; Li Feng; Yongze Liu; Liqiu Zhang

doi:10.1016/j.jhazmat.2022.129374

Synthesis of adjustable {312}/{004} facet heterojunction MWCNTs/Bi₅O₇I photocatalyst for ofloxacin degradation: Novel insights into the charge carriers transport

J Hazard Mater. 2022 Sep 5:437:129374. doi: 10.1016/j.jhazmat.2022.129374. Epub 2022 Jun 15.

Authors

Peng Gao¹, Shaojiang Huang¹, Kang Tao¹, Zexin Li¹, Li Feng², Yongze Liu¹, Liqiu Zhang³

Affiliations

¹ Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
² Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China. Electronic address: fengli@bjfu.edu.cn.
³ Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China. Electronic address: zhangliqiu@bjfu.edu.cn.

PMID: 35897183
DOI: 10.1016/j.jhazmat.2022.129374

Abstract

Multi-wall carbon nanotubes (MWCNTs) with high electrical conductivity are commonly accounted as the ideal additives to enhance the charge surface migration efficiency in photocatalysis. Theoretically, the MWCNTs-modified binary photocatalysts have potential for the change of nanocrystal structure. Herein, we reports an adjustable {312}/{004}facet heterojunction MWCNTs/Bi₅O₇I nanocomposite. Interestingly, the synergistic effect of {312}/{004}facet heterojunction and MWCNTs can effectively accelerate the spatial charge carriers transport. A novel {312}/{004}facet "S-scheme" pathway was proven to be the dominated pathway for the enhancement of spatial charge carriers. As a result, the MWCNTs-{312}/{004}Bi₅O₇I composites exhibited superior photocatalytic oxidation efficiency for a representative antibiotics ofloxacin photodegradation. Density functional theory (DFT) calculation and LC-MS/MS analysis confirmed that the possible dealkylation and oxidation pathways could be found in OFL degradation. This work provides novel insights for the relationship between charge carrier transport and facet structure-property.

Keywords: Bi(5)O(7)I; MWCNTs; Ofloxacin; S-scheme heterojunction; Spatial charge carriers.

Publication types

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

MeSH terms

Catalysis
Chromatography, Liquid
Nanotubes, Carbon* / chemistry
Ofloxacin / chemistry
Tandem Mass Spectrometry

Substances

Nanotubes, Carbon
Ofloxacin