激进的
结晶度
过硫酸盐
催化作用
光化学
猝灭(荧光)
化学
X射线光电子能谱
Crystal(编程语言)
电子转移
电子顺磁共振
材料科学
化学工程
结晶学
有机化学
荧光
程序设计语言
计算机科学
工程类
物理
核磁共振
量子力学
作者
Zhenchun Tang,Xinquan Zhou,Mengyao Du,Ruichang Zhang,Hang Xu,Shuge Peng,Xuefeng Wei
出处
期刊:Small
[Wiley]
日期:2024-02-26
被引量:1
标识
DOI:10.1002/smll.202312173
摘要
Abstract In heterogeneous persulfate‐catalyzed oxidation systems, the mechanism underlying the crystal plane effects of the catalyst on the selective conversion of reactive oxygen species (ROS) remains ambiguous. In this study, nano‐Co 3 O 4 catalysts with varying crystallinity and exposure levels of (111) crystal planes are prepared via a hydrothermal method. Compared to low crystalline catalysts, high crystallinity catalysts predominantly expose (111) planes containing higher concentrations of Co 2+ and oxygen vacancies (Ov), resulting in an increase degradation efficiency of p‐nitrobenzaldehyde (4‐NBA) from 74.5% to 100%. Radical quenching experiments and EPR characterization reveal that the degradation of 4‐NBA occurs through a radical pathway, and quantification of radicals demonstrates that increasing exposure levels of (111) planes effectively promote radical yield (C SO4•‐ increase from 18.2 to 172.8 µ m and C •OH increase from 1 to 58.9 µ m ). Furthermore, XPS and DFT calculations indicate that high crystallinity catalyst possesses more Ov active sites on (111) planes. The presence of Ov not only facilitates the adsorption of PMS molecules but also enhances electron transfer from Co 2+ to PMS, leading to directed formation and efficient transformation of radicals. This study presents a novel strategy for promoting efficient radical formation in persulfate‐activated systems.
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