Nitrogen-doped carbon material encapsulated Fe3C with dual-reaction centres to boost peroxymonosulfate activation for efficient organic pollutant removal. (February 2023)

• Record Type: Journal Article
• Authors: Fan, Xinfei; Yang, Jia; Liu, Na; Xu, Yuanlu; Yu, Yueling; Song, Chengwen; Liu, Yanming
• Is Part Of: Journal of water process engineering. Volume 51(2023)
• Publication Date: 2023-02
• Subjects: Nitrogen doped carbon -- Dual-reaction centres -- PMS activation; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2022.103382
• Languages: English
• ISSNs: 2214-7144

Abstract

Abstract: Peroxymonosulfate (PMS) activation based on iron-based catalyst has caught increasing attention in wastewater treatment, but is strongly impeded by the sluggish kinetics of Fe(II) recovery. In this study, nitrogen-doped carbon encapsulated Fe3 C with dual-reaction centres coupled via CFe channel was developed by electrospinning and Chemical Vapor Deposition (CVD) technique. The remarkable catalysis performance was conferred by the formation of CFe short bond which linked C poor electron reaction centres from N-doped carbon frameworks and the Fe rich electron reaction centres from Fe3 C. Fe@NC-800 achieved 100% sulfamethoxazole (SMX) degradation within 20 min, and showed excellent cycle stability after 5 cycles. The electron transfer rate between the dual-reaction region was accelerated due to short transport distance and low transmission resistance. Electrons from pollutants were compensated to Fe 3+ via CFe bond bridges, promoting the regeneration of Fe 2+ and accelerating the efficiency of the Fe 2+ /Fe 3+ cycle. Besides, the experiments of reactive oxygen species (ROS) quenching and capture revealed the degradation pathway. Both radical and nonradical oxidation played a key role in the Fe@NC-800/PMS system. This work will offer a valuable clue on the design of multi-benefit catalysts to achieve efficient removal of pollutants in wastewater. Highlights: Nitrogen-doped carbon encapsulated Fe3 C with dual-reaction centres was synthesized. Fe@NC showed excellent catalytic property toward PMS activation for SMX removal. Fe 2+ /Fe 3+ cycle was accelerated due to CFe short bond and defect structure. Both radical and non-radical oxidation were involved in the degradation of SMX.