Authors
Qingyi Liliu, Zibo Xu, Yuqing Sun, Eakalak Khan, Nigel J D Graham, Daniel C W Tsang
Published in
Journal of environmental management. Volume 388. Pages 125931. May 28, 2025. Epub May 28, 2025.
Abstract
Microwave (MW)-assisted catalytic oxidation with mineral-carbon composites is a potentially promising method for treating organic pollutants, but the underlying mechanisms involving varying mineral/carbon species remain unclear. To address this, we regulated the mineral and carbon speciation in the MW-assisted synthesis of CuFe-biochar composites by varying pyrolysis conditions and evaluated their roles in the MW-assisted generation of reactive oxygen species. The presence of CuFe-biochar composites significantly promoted the generation of •O2- and •OH radicals with H2O2, with an increased removal efficiency of two organic dyes as an example for real-time image visualization in the MW reactor, Acid Orange 7 and Malachite Green (up to 97.8 % and 100 %, respectively). Increasing pyrolysis temperature and/or Fe content promoted graphitization and enhanced MW absorption (absorption broadband from 0.16 GHz to 8.56 GHz). The co-presence of Fe supported the uniform distribution of reactive Cu particles (such as Cu and Cu2O) with smaller sizes (from 45 nm to 1.5 nm), promoting the generation of •O2- radicals for the organic degradation. This study reveals the key speciation of the CuFe-biochar composites that can facilitate the MW-assisted degradation of organic pollutants via radical generation, paving the way for efficient MW-assisted decontamination.
PMID:
40440934
Bibliographic data and abstract were imported from PubMed on 30 May 2025.
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