催化作用
氢氧化物
钯
选择性
化学
阳离子聚合
吸附
协同催化
无机化学
2,4-二氯苯酚
有机化学
生物
细菌
遗传学
作者
Zhenyu Kong,Daohao Li,Rongsheng Cai,Tao Li,Lipeng Diao,Xiaokang Chen,Xiaoxia Wang,Zhefei Zhao,Jia Yi,Dongjiang Yang
标识
DOI:10.1016/j.jhazmat.2023.132964
摘要
Palladium (Pd) is regarded as a promising electrocatalytic hydrodechlorination (EHDC) catalyst for the detoxification of halogenated phenols. Nevertheless, its intrinsic EHDC activity is seriously restricted by the hydrogen evolution reaction (HER), consuming the active hydrogen (H*) for EHDC. Here, we report a defect regulation strategy using cationic vacancies rich CoFeV-LDH with coupling ultrafine Pd nanoparticles that induces optimized electron distribution of Pd to promote EHDC. The experimental and theoretical results reveal that superior EHDC performance of Pd@CoFeV-LDH is attributed to the electron-rich Pd regulated by cationic vacancies in CoFeV-LDH support, driving facile adsorption of halogenated phenols, high water activation ability and H* selectivity for EHDC. Our findings provide a versatile defect-regulating strategy to overcome the challenge in efficiency and selectivity of EHDC process. The prepared Pd@CoFeV-LDH catalyst shows excellent performance of 95.46% to 2,4-dichlorophenol (2,4-DCP) for EHDC, extensive pH (4-11) adaptability, outstanding anti-poisoning ability (adaptability to 4 mM Cl-, NO3-, NO2-, CO32- anions in water), and indurative physicochemical stability. The SMSI effect between Pd and CoFev-LDH support induced the electrons transfer from the support to the loaded Pd active sites, which provided positive effect of H* selectivity, water activation, and adsorption of 2,4-DCP during EHDC. This study unveils the mechanism of enhanced EHDC performance on defective TM-LDHs supported Pd, which provides new insights for solution of halogen pollutants and environmental remediation.
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