电子顺磁共振
煅烧
催化作用
碳化
化学
化学工程
金属
浸出(土壤学)
材料科学
吸附
有机化学
工程类
物理
核磁共振
环境科学
土壤科学
土壤水分
作者
Qiao Wang,Yan Jiang,Xinhong Lin,Huarui Li,Xi Wang,Wei Wang
标识
DOI:10.1016/j.seppur.2023.124359
摘要
Developing efficient heterogeneous catalysts are of great importance for utilizing peroxymonosulfate-based advanced oxidation processes (PMS-AOPs) toward environment remediation. In this work, a novel composites Fe3C/Mo2C@CPANI are synthesized via hydrothermal and calcination with a precursor of metal salt and PANI. The derived Fe3C and Mo2C nanoparticles are wrapped into the nitrogen-doped carbon layer thanks to the rationally structure design, which can not only suppress metal ions leaching but also promote carbocatalysis by synergistic effect. The as-synthesized catalyst exhibited excellent performance in activating PMS with a fast 4-CP degradation rate (k = 0.79 min−1). On the basis of surface chemistry analysis, the graphite N, C=O group, Fe2+ and Mo2+ are considered to be active sites that responsible for PMS activation. The electron paramagnetic resonance (EPR) and competitive quenching test both witnessed the existence of SO4•−, •OH, O2•− and 1O2 in the Fe3C/Mo2[email protected]/PMS system, while SO4•− and 1O2 are considered as dominant reactive oxygen species (ROSs). Additionally, the influences of various reaction parameters on 4-CP removal were systematically investigated, where Fe3C/Mo2[email protected] could maintain its catalytic capacity under different conditions. This study proposes a facile method for fabricating metal carbide/carbon hybrids with rational structure and brings new insights into the radical/nonradical pathway in PMS activation process.
科研通智能强力驱动
Strongly Powered by AbleSci AI