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高效的M-NC单原子催化剂用于净水中的催化臭氧化:性能和机制

Guojie Ye¹, Zhengwei Zhou¹, Zhenyu Zhao¹

¹State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science & Engineering, Tongji University, Shanghai 200092, China.

Journal of hazardous materials

|July 25, 2024

概括

新的单原子催化剂 (SAC) 通过异质催化臭氧化 (HCO) 有效地去除水污染物. 基于Co的SAC表现出卓越的性能,提供了对原子级催化机制和水净化催化剂设计的见解.

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:

异质催化臭氧化 (HCO) 是一个有前途的净水技术.
现有的HCO方法面临着诸如有限的活性金属位点,金属浸和不太了解结构-活性关系等挑战.

研究的目的:

开发新型单原子催化剂 (SACs) 来增强异质催化臭氧化.
研究M-NC (M=Co,Ni,Fe,Mn) SACs在去除耐火有机污染物的催化性能和机制.
在原子层面阐明活性点和反应途径的作用.

主要方法:

合成M-NC单原子催化剂 (SACs) 的方法.
使用异质催化臭氧化去除耐火污染物的催化性能评估.
在过程中产生的反应性物种的识别.
动力学研究和速率常数的确定.
为了探索催化机制,进行理论计算.

主要成果:

多国企业的SAC表现出高原子效率和最小的金属液.
基于Co的SAC (Co-NC) 在去除耐火污染物方面表现出卓越的性能,对于硫甲醇去除,正常化速率常数为13.53分钟-1·mM_metal-1·g·m-2.
丰富的酸位点 (路易斯和布伦斯特德) 和高效的电子转移有助于增强的催化活性.
确定了包括OH_ads,OH_free,*O和1O2在内的关键反应物种.
机理学研究揭示了易斯酸位点在促进臭氧分解和OH生成方面的作用.

结论:

单原子催化剂设计对于推进异质催化臭氧化至关重要.
开发的M-NC SAC,特别是Co-NC,为净水提供了一种高效和稳定的方法.
这项研究更深入地了解了控制异质催化臭氧化的原子层机制.

关键词:

催化臭氧化催化臭氧化一个原子的催化剂.结构与活动的关系.过渡金属是一种过渡金属.

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