戒毒(替代医学)
钯
化学
纳米颗粒
催化作用
化学工程
环境化学
纳米技术
材料科学
有机化学
医学
替代医学
病理
工程类
作者
Zhang Jun,Shuyue Liu,Shiyu Lu,Chun-Yuan Wang,Pei Liang,Huan Yi,Mengjie Li,Li Luo,Rong Wang,Guangming Jiang
出处
期刊:Fuel
[Elsevier]
日期:2024-05-01
卷期号:364: 131001-131001
标识
DOI:10.1016/j.fuel.2024.131001
摘要
Improving the utilization of hydrogen radicals (H*) is of great significance for effective Pd-mediated electrocatalytic hydrodechlorination (EHDC) in detoxifying chlorinated organic pollutants (COPs). However, the limited H* utilization by single Pd arises from its inadequate performance in adsorbing/activating COPs and inferior mass transfer of low-concentration COPs. In this study, an urchin-like yolk/shell TiO2 spheres with mesoporous structure are developed for supporting Pd nanoparticles (Pd/U-TiO2), which exhibits superior EHDC activity and selectivity for 2,4-DCP reduction. Notably, the prepared Pd/U-TiO2 catalyst achieves a mass activity of 4.2 min−1 gPd-1 and a specific activity of 1.94 min−1 molPd-1 when detoxifying 50 mg/L of 2,4-DCP at −0.85 V, surpassing the most reported catalysts. Furthermore, the Pd/U-TiO2 catalyst consistently demonstrates higher H* utilization efficiency compared to single Pd, regardless of the 2,4-DCP concentration or reaction mode (batch or continuous-flow). This enhanced H* utilization efficiency is attributed to two key factors: the urchin-like and yolk/shell structure of U-TiO2 enhances the mass diffusion of 2,4-DCP, and the strong interactions between Pd and U-TiO2 generate electron-rich Pd species that enhance the adsorption and activation of COPs. Overall, this work highlights the synergistic effects of strong metal-support interactions and mass diffusion in enhancing atomic H* utilization. This study lays a significant experimental and theoretical foundation for designing efficient electrocatalysts for the detoxification of chlorinated organic pollutants and various other halogenated organic pollutants.
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