期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 328, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2023.125135
关键词
Spinel cobalt ferrite; Quantum dots; Toluene degradation; Wet scrubber; Electron transfer
In this study, a liquid-phase wet washing process based on PMS advanced oxidation was developed to effectively remove toluene. The CFQ/AC/PMS system achieved stable and efficient removal of toluene with high mineralization capability and reduced secondary air pollution.
In this study, we have developed a liquid-phase wet washing process based on PMS advanced oxidation for the effective removal of toluene. Our approach involved synthesizing a high surface area composite catalyst (CFQ/ AC) through a one-step process, in which 0 D CoFe2O4 was deposited onto low-cost activated carbon, endowing it with abundant surface-active sites that facilitate continuous PMS activation. The Co(III)/Fe(III) generated by the reaction captures electrons from the PMS, thus achieving Co(II)/Fe(II) regeneration and realizing two complete redox cycles of Co(III)/Co(II) and Fe(III)/Fe(II). During the liquid-phase catalytic reaction process, the CFQ/AC/PMS system consistently achieved a stable removal efficiency of over 96% within 2 h, with a selectivity of more than 80% for CO2, indicating high mineralization capability. Furthermore, based on the detection and analysis of GC-MS, there were few gaseous intermediates in the tail gas, leading to a significant reduction in secondary air pollution. By conducting electrochemical analysis and in-situ Raman spectroscopy, the transition metal valence changed and the combination of PMS with CFQ/AC formed charge transfer intermediates that led to toluene degradation. This mechanism utilized a cost-effective carbon-based composite catalyst, making it a practical and accessible solution for environmental applications.
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