支持选择性的单个原子的Fenton-like催化活动,依赖于工作功能(IV) =O生成
Xue Li1, Xiangcheng Zhang1, Junyu Lang2
1School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
在TiO2上的单原子催化剂有效地产生高价值的氧物种用于污染物降解. 支持工作功能是提高过氧硫酸盐激活和催化剂性能的关键.
科学领域:
- 环境化学环境化学
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
背景情况:
- 高价值的氧物种对于芬顿式反应至关重要,但由于电子排斥,很难产生.
- 单原子催化剂 (Co-SACs) 具有激活过氧硫酸盐 (PMS) 的潜力,但需要优化生成活性物种.
研究的目的:
- 为了证明从PMS激活到Co-SACs的CoIV=O生成.
- 调查支持工作功能 (WF) 对CoIV=O生成和PMS激活的影响.
- 评估Co-SACs对污染物降解的催化性能.
主要方法:
- 在现场使用Co K边缘X射线吸收光谱来监测CoIV=O生成.
- 在各种材料上支持的单原子催化剂被合成和特征化.
- 硫甲醇 (SMX) 降解被用作模型反应来评估催化活性.
主要成果:
- 由于电子金属支相互作用 (EMSI),CoIV=O生成取决于支工作功能.
- 解剖酶-TiO2支持高WF促进PMS结合和增强CoIV=O生成.
- 与其他Co-SAC和自由基相比,Co-TiO2催化剂表现出优越的SMX降解活性和稳定性,CoIV=O度明显更高.
结论:
- 支选择对于增强高价值金属氧物种的产生和支持金属SAC中的PMS激活至关重要.
- 由于持续的SMX去除和最小的泄漏,Co-TiO2 / PMS系统对高效的水净化充满希望.
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