Non-radical pathway dominated degradation of organic pollutants by nitrogen-doped microtube porous graphitic carbon derived from biomass for activating peroxymonosulfate: Performance, mechanism and environmental application

Ke Zhu; Chenchen Liu; Wen Xia; Yumeng Wang; Hongmei He; Lele Lei; Yushi Ai; Wenjin Chen; Xiaobo Liu

doi:10.1016/j.jcis.2022.06.078

Non-radical pathway dominated degradation of organic pollutants by nitrogen-doped microtube porous graphitic carbon derived from biomass for activating peroxymonosulfate: Performance, mechanism and environmental application

J Colloid Interface Sci. 2022 Nov:625:890-902. doi: 10.1016/j.jcis.2022.06.078. Epub 2022 Jun 23.

Authors

Ke Zhu¹, Chenchen Liu¹, Wen Xia², Yumeng Wang³, Hongmei He¹, Lele Lei¹, Yushi Ai¹, Wenjin Chen⁴, Xiaobo Liu⁵

Affiliations

¹ School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China.
² School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
³ School of Medicine, University of Electronic Science and Technology of China, Chengdu 611731, China.
⁴ School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China; Sichuan Province Engineering Technology Research Center of Novel CN Polymeric Materials, 611731 Chengdu, China. Electronic address: cwj@uestc.edu.cn.
⁵ School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China; Sichuan Province Engineering Technology Research Center of Novel CN Polymeric Materials, 611731 Chengdu, China. Electronic address: liuxb@uestc.edu.cn.

PMID: 35777096
DOI: 10.1016/j.jcis.2022.06.078

Abstract

The agricultural waste-derived biochar can be used as an effective green catalyst for peroxymonosulfate (PMS) activation to utilize the biomass resource. Herein, nitrogen-doped microtubes porous graphitic carbon (N-MPGC) derived from loofah sponge was facilely prepared via the impregnation-calcination method. The amount of N doping was positively correlated with the catalytic performance of N-MPGC. The obtained N-MPGC-2 as a metal-free carbon catalyst showed excellent ability for rhodamine B (RhB) degradation via PMS activation with the pseudo-first-order reaction rate constant (k) of 0.293 min^-1, which was 22.5-fold as high as that over microtube porous carbon (MPC). Besides, N-MPGC-2 showed still outstanding stability and reusability for RhB degradation after ten successive cycles. Excitingly, the N-MPGC-2 membrane exhibited good catalytic activity after the N-MPGC-2 had been immobilized in the polytetrafluoroethylene (PTFE) membrane. Non-radical pathways including singlet oxygen and electron transfer played a major role in RhB degradation for the N-MPGC-2/PMS/RhB system. The carbonyl (CO) group and graphitic N of N-MPGC-2 were the main active sites for PMS activation. This work opened a new idea for synthesizing N-doped biochar as a low-cost and high-efficiency catalyst and provided theoretical support for the mechanism of biochar-based carbonaceous materials activation of PMS for practical applications.

Keywords: Biochar; Electron transfer; Nitrogen-doped; Peroxymonosulfate; Singlet oxygen.

MeSH terms

Biomass
Carbon / chemistry
Environmental Pollutants*
Graphite*
Nitrogen
Peroxides / chemistry
Porosity

Substances

Environmental Pollutants
Peroxides
peroxymonosulfate
Carbon
Graphite
Nitrogen