数字农科院2.0

Water involved in transformation of soil organo-mineral fractions during catalytic thermal desorption of dioxins-like polychlorinated biphenyls

文献类型： 外文期刊

作者： Juan Zhang;Xiaojun Liu;Jinhao Gao;Wei Guo;Jianfeng Zhang;Wentao Jiao

作者机构：

关键词： Clay mineral catalysts;Hydride ion conductivity;Polychlorinated biphenyls;Selective transformation pathways;Thermal catalytic reduction

期刊名称： Journal of Cleaner Production

ISSN： 0959-6526

年卷期： 2025 年 486 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： To turn a disadvantage into an advantage for clay soils with strong water retention, it necessitates water-activation-facilitated reductive thermal desorption (TD) of dioxins-like polychlorinated biphenyls (dl-PCBs). The acidic clay soil with abundant clay minerals (CH) and basic clay soil with unique K2O (CL) were supplemented with CaO-based additives, against nano-Fe0 (NZVI) and plasmonic nano-TiN with good hydride ion conductivities. As regards to molecular configurations of dl-PCBs, the high-efficiently removed heptachlorobiphenyl and instead refractory tetrachlorobiphenyl were identified by TD pilot study without water activation, which was further certificated via calculated dechlorination pathways. The TD results and theoretical calculations revealed that naturally occurring K2O induced water activation in CL rather than water-suppressed TD in CH. And water was involved in electron transfer of deoxygenation-aromatization process at the soil organo-mineral interface during catalyst-enhanced TD with removal efficiencies increment of 59.1% in CH, which was firstly characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) analyses. Interestingly, the NZVI and the plasmonic nano-TiN facilitated selective aromatization of epoxide and C-heteroatom groups in CH, as opposed to selective esterification and epoxidation of aliphatic C-O groups in CL, and detailed transformation mechanisms of soil organic carbon were revealed by X-ray photoelectron spectroscopy (XPS).

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