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Institution:山东大学

Title of Paper:Well-dispersed cobalt nanoparticles encapsulated on ZIF-8-derived N-doped porous carbon as an excellent peroxymonosulfate activator for sulfamethoxazole degradation

Journal:Chemical Engineering Journal

Place of Publication:Elsevier

Key Words:MOFs-derived porous carbon； encapsulated Co NPs； PMS activation； synergistic interaction； non-radical pathway

Summary:The practical application of carbon materials supported cobalt (Co)-based heterogeneous materials as excellent peroxymonosulfate (PMS) activators has attracted wide attention in recent years because of their low particle self-agglomeration and low Co leaching. Herein, we developed a new synthetic strategy for designing Co nanoparticles (Co NPs)-encapsulated zeolitic imidazolate frameworks-8-derived porous carbon (NC) (denoted as Co-N@NC-x) by calcinating NC with a polydopamine-chelating Co coating. It was demonstrated that NC could effectively prevent Co agglomeration because it provided rich load sites for Co. Raman and X-ray photoelectron spectroscopy results indicated that the addition of Co could increase the surface defects of NC. Co-N@NC-x (0.1 g/L) efficiently catalyzed PMS to degrade 96.91% of sulfamethoxazole (SMX, 20 mg/L) within 90 min with an initial pH of 3.65–9.05 based on the synergistic effect between Co NPs and NC. It was demonstrated that Co NPs were the main active sites, and the defects and carbonyl (C=O) group active sites also contributed to SMX degradation by catalyzing PMS. Graphitic N was an adsorption site for SMX. A singlet oxygen (1O2)-dominated non-radical mechanism has been proposed. Additionally, Co-N@NC-90 exhibited excellent stability resulting from NC encapsulation. This work provides a novel approach for the application of metal organic framework-derived carbon-supported metal catalysts in wastewater purification.

First Author:Hao Liu

Correspondence Author:Shan Zhao

All the Authors:Zuoli He,Jiahuan Li

Indexed by:Journal paper

Volume:541

Issue:4

Page Number:138597

DOI Number:10.1016/j.cej.2022.138597

Number of Words:6000

Translation or Not:No

Date of Publication:2023-01

Included Journals:SCI

Links to Published Journals:https://doi.org/10.1016/j.cej.2022.138597

Release Time:2022-08-12