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

第一作者： Zhang, Juan

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

作者机构：

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

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：10.0； 五年影响因子：10.7 ）

ISSN： 0959-6526

年卷期： 2025 年 486 卷

页码：

收录情况： SCI

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 organomineral 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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