Zhao Yan, Song Min, Cao Qi, Sun Peizhe, Chen Yonghao, Meng Fanyue
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China.
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China.
J Hazard Mater. 2020 Dec 5;400:122887. doi: 10.1016/j.jhazmat.2020.122887. Epub 2020 May 15.
CuFeO nanoparticles are decorated on biochar (BC) by modified sol-gel method to form the CuFeO@BC catalyst for persulfate (PS) activation in a wide pH range. The application of CuFeO@BC for o-nitrochlorobenzene degradation in soil was explored in this study. The mechanism of heterogeneous PS activation was comprehensively investigated. The synergistic effects between CuFeO and BC could enhance catalytic activity and stability, including well dispersed CuFeO species, efficient electron transfer and abundant oxygen functional groups. The superoxide radicals (O) produced from CuFeO and BC could mediate Cu(I)/Cu(II) and Fe(II)/Fe(III) redox pairs on CuFeO@BC surface to activate PS, and then generating •OH and SO continuously. Moreover, the reaction intermediates are identified as well to elucidate the possible degradation pathways. These findings help to achieve more comprehensive understanding of the heterogeneous activation process of PS by CuFeO@BC catalyst.
通过改进的溶胶-凝胶法将CuFeO纳米颗粒负载于生物炭（BC）上，以形成用于在较宽pH范围内活化过硫酸盐（PS）的CuFeO@BC催化剂。本研究探索了CuFeO@BC在土壤中降解邻硝基氯苯的应用。全面研究了非均相PS活化的机制。CuFeO与BC之间的协同效应可提高催化活性和稳定性，包括CuFeO物种的良好分散、有效的电子转移和丰富的氧官能团。由CuFeO和BC产生的超氧自由基（O）可介导CuFeO@BC表面的Cu（I）/Cu（II）和Fe（II）/Fe（III）氧化还原对以活化PS，进而持续产生•OH和SO。此外，还鉴定了反应中间体以阐明可能的降解途径。这些发现有助于更全面地理解CuFeO@BC催化剂对PS的非均相活化过程。
