调节光诱导激活通路和反应性物种,通过对比斯瓦纳酸盐的面体工程
Zihang Cheng1, Ruixuan Wang2, Chii Shang3
1School of Environment and Chemical Engineering, Foshan University, Foshan 528000, China.
Journal of hazardous materials
|August 17, 2025
概括
这项研究揭示了可见光如何使用工程 BiVO4.4 激活自由. 不同的BiVO4方面控制路径,增强水处理的反应性物种.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 光催化作用的光催化
背景情况:
- 将异质光催化与自由 (HOCl/ClO-) 结合起来,可以提高反应性物种的产量.
- 这些过程中激活的确切机制尚不清楚.
- 了解这些机制对于优化高级氧化过程至关重要.
研究的目的:
- 在可见光下通过面部和形态工程的BiVO4研究HOCl/ClO-激活的机制.
- 阐明电子,孔和氧物种在激活中的作用.
- 为了将BiVO4面暴露与特定的激活通路相关联.
主要方法:
- 面部和形态工程 BiVO4.4 的合成.
- 在HOCl/ClO-.的存在下对BiVO4进行可见光照射.
- 使用氧化酸盐 (孔) 和Cu2+ (电子穿) 来探测反应机制.
- 在光催化过程中产生的基和离子物种的分析.
主要成果:
- 电子 (eCB-) 和超氧化基 (O2•-) 通过一电子转移将HOCl激活为基基 (HO•).
- 电子通过两电子转移将ClO-减少到Cl- ,而孔 (hVB+) 则激活HOCl和ClO-到ClO•.
- BiVO4方面工程 (例如,{110}与{010}) 指导主导激活路径 (由孔或电子/O2驱动).
- 氧气增强HO•生产,减少清理,提高效率.
结论:
- 提供了对HOCl和ClO-激活通过电子,孔和氧物种的独特机制的新见解.
- 这项研究表明,BiVO4的面向工程如何可以选择性地调节这些激活通路.
- 这些发现为设计利用自由净化水的先进光催化系统提供了基础.
相关概念视频
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.2K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.2K
02:46Halogenation of Alkenes
16.5K
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
16.5K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.9K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.9K