Enhanced piezoelectric catalysis of BaTiO3 by ZVAl for mechanochemical defluorination of PFOA: Promotion of electron transfer,Journal of Hazardous Materials

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Enhanced piezoelectric catalysis of BaTiO3 by ZVAl for mechanochemical defluorination of PFOA: Promotion of electron transfer
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2023-11-19 , DOI: 10.1016/j.jhazmat.2023.133040
Ruoning Guo ₁ , Li Li ₁ , Zhiwei Zhao ₁ , Sai Zhang ₁

Affiliation

Mechanochemical (MC) destruction of pollutants is effective; however, the emerging electron transfer mechanism is ambiguous owing to a lack of systematic evaluation. Therefore, this study aims to evaluate the contribution of electrons to perfluorooctanoic acid (PFOA) defluorination during MC process. A synergistic effect was obtained by activating BaTiO3 to generate piezoelectrons and applying zero-valence aluminum (ZVAl) to facilitate electron transfer, with 95.66% PFOA defluorination and reaction time decreasing from 6 h to 3 h. The mechanism of piezoelectric catalysis of the BaTiO3/ZVAl system was further investigated through kinetic analyses and intersystem comparisons. The major contribution of piezo-excited electrons was revealed through probe detection and quantitative determination. A positive correlation between electron generation and PFOA defluorination was ascertained, and the calculation of the electron utilization ratio revealed an electron transfer mechanism. The detached fluorides were confirmed to be bonded directly to the additives. Furthermore, PFOA decomposition was identified as a cyclical process with constant dissociation of the CF2 groups.

中文翻译：

ZVAl 增强压电催化 BaTiO3 对 PFOA 的机械化学脱氟作用：促进电子转移

污染物的机械化学（MC）销毁是有效的;然而，由于缺乏系统评估，新兴的电子转移机制是模糊的。因此，本研究旨在评估 MC 过程中电子对全氟辛酸（PFOA）脱氟的贡献。通过激活 BaTiO3 产生压电并应用零价铝（ZVAl）促进电子转移，获得协同效应，PFOA 脱氟率为 95.66%，反应时间从 6 h 缩短到 3 h。通过动力学分析和系统间比较，进一步研究了 BaTiO3/ZVAl 体系的压电催化机制。压电激发电子的主要贡献是通过探针检测和定量测定揭示的。确定了电子生成与 PFOA 脱氟之间的正相关关系，电子利用率的计算揭示了电子转移机制。证实分离的氟化物直接粘合到添加剂上。此外，PFOA 分解被确定为 CF2 基团不断解离的循环过程。

更新日期：2023-11-19

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