Non-radical dominated catalytic degradation of chlorophenol by a structure-tailored catalyst of high nitrogen doping carbon matrix with nano-CuO. Issue 3 (June 2022)

• Record Type: Journal Article
• Authors: Jiang, Zhi; Xie, Yan; Li, Chaofang; Zheng, Junhao; Si, Mengying; Xiao, Ruiyang; Liao, Qi; Yang, Weichun
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 3(2022)
• Publication Date: 2022-06
• Subjects: Non-radical pathway -- Oxygen vacancies -- Electron transfer -- 4-Chlorophenols; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.107559
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Non-radical oxidation process is very important in advanced oxidation for efficient degradation of the organics with electron-donating groups such as chlorophenols. In this work, a structure-tailored catalyst of high nitrogen doping carbon matrix with nano-CuO (CuO-NC) for efficient and dominant non-radical catalysis was successfully constructed and synthesized. As a persulfate (PS) activation catalyst, CuO-NC exhibits high catalytic activity in 4-chlorophenol(4-CP) degradation with removal efficiency of 100% within 30 min, strong resistance to coexisting substances (humic acid, Cl -, NO3 -, HCO3 - ), wide suitable solution pH range (3.0–11.0). Electron paramagnetic resonance (EPR) analysis, quenching tests and electrochemical measurements verified the dominant non-radical catalysis via 1 O2 generation and mediated electron transfer in the CuO-NC/PS/4-CP system. The possible 4-CP degradation pathway was also proposed. It is unveiled that the tailored electronic property and active sits (carbon structure defect and oxygen vacancies) are the reasons for the highly efficient non-radical catalysis on CuO-NC. In addition, the highly efficient non-radical system of CuO-NC possesses good reusability for PS activation and fine applicability in the degradation of organic with electron-donating groups. This study provides an effective strategy to rationally design non-radical catalysts for the efficient oxidative degradation of electron rich organic pollutants and deepens the understanding of non-radical catalysis for organic pollutants treatment. Graphical Abstract: ga1 Highlights: Tailored catalyst CuO-NC obtained for efficient and dominated non-radical reaction. CuO-NC has high catalytic activity with complete removal of 4-CP within 30 min. CuO-NC/PS exhibits pH independence, great tolerance of coexisting substances. Non-radical reaction is due to high N doping, structure defect and oxygen vacancy.