在Cu单原子催化剂中的协同协调增强高价值铜氧物种,以有效地激活PMS
Yi Shen1,2, Yongliang Pan3, Chao Zhu3
1Key LaboraStory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, 310032, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|September 2, 2024
概括
一种新型的单原子催化剂,CuSA/CNP&S,增强了对污染物降解的过氧硫酸盐激活. 它选择性地产生高价值的金属氧物种,大大提高了催化效率和污染物去除.
科学领域:
- 环境科学与工程环境科学与工程
- 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:
- 高价值金属氧 (HVMO) 物种是通过过氧硫酸盐 (PMS) 激活有机污染物降解的关键氧化剂.
- 对于高效的HVMO产生,催化剂设计在吸附点和电子转移方面面临着挑战.
- 单原子催化剂可以精确控制活性部位,以提高催化性能.
研究的目的:
- 为了合成和表征一种新的单原子催化剂 (CuSA/CNP&S),具有多种类型的异原子协调,用于PMS激活.
- 研究选择性HVMO物种产生机制及其在污染物降解中的作用.
- 评估催化剂在从水性基质中去除有机污染物的效率,选择性和耐用性.
主要方法:
- 用H键辅助自组装策略合成CuSA/CNP&S单原子催化剂.
- 催化剂结构的表征,包括Cu活性中心和 heteroatom 协调 (P 和 S).
- 对双A降解的动力学研究 (伪第一阶) 和各种水性矩阵中的性能评估.
- 理论计算 (DFT) 和实验验证,以阐明P和S协调在催化机制中的作用.
主要成果:
- 证实了CuN3活性中心在P-修饰碳矩阵中具有轴向S协调的均分布.
- CuSA/CNP&S选择性激活PMS以产生Cu(III)OH物种,主要的活性氧物种 (ROS).
- 与未经修改的催化剂相比,双A降解的伪第一阶动力速率增加了17.57倍 (1.51分钟-1).
- 催化剂在清除各种水母中的各种污染物方面表现出高效率和耐用性.
结论:
- 合成的CuSA/CNP&S催化剂有效地减轻了HVMO物种生成中选择性和产量低的问题.
- 平面P原子的内在电场增强了电子转移,而轴向S协调通过d-band中心和eg*带调优化了PMS吸附.
- 这种多种类型的协调策略为设计先进的单原子催化剂提供了有希望的途径,以有效地改善环境.
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