An N,S-Anchored Single-Atom Catalyst Derived from Domestic Waste for Environmental Remediation,ACS ES&T Engineering

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An N,S-Anchored Single-Atom Catalyst Derived from Domestic Waste for Environmental Remediation
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2021-08-27 , DOI: 10.1021/acsestengg.1c00255
Peixin Cui ₁ , Qiang Yang _{1,

2} , Cun Liu ₁ , Yu Wang ₃ , Guodong Fang ₁ , Dionysios D. Dionysiou ₄ , Tongliang Wu ₁ , Yiyi Zhou _{1,

5} , Junxiang Ren _{1,

5} , Hongbo Hou ₂ , Yujun Wang _{1,

5}

Affiliation

As the smallest entities in catalysts, single-atom catalysts (SACs) exhibit superior atomic efficiency, advanced activity, and high selectivity. However, their practical applications are inhibited due to their high preparation costs. Here, we developed a novel cobalt–carbon-based SAC derived from the mild pyrolysis of spent coffee grounds soaked in Co (Co-CGBC), in which cobalt atoms atomically disperse and coordinate with the N and S atoms in the carbon substance, as identified by X-ray absorption fine structure (XAFS) spectroscopy combined with high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Co-CGBC is inexpensive and exhibits high efficiency in the activation of peroxymonosulfate (PMS) to degrade a wide range of organic pollutants with a degradation efficiency of 90–100%. Density functional theory (DFT) calculations confirm that the sulfur in the Co–N₃S₁ active site plays a crucial role in reducing the adsorption energy of PMS and facilitating electron transfer. This work supplies new opportunities to synthesize cost-effective SACs for application in environmental remediation.

中文翻译：

一种用于环境修复的源自生活垃圾的 N、S 锚定单原子催化剂

作为催化剂中最小的实体，单原子催化剂（SAC）表现出优异的原子效率、先进的活性和高选择性。然而，由于其高昂的制备成本，它们的实际应用受到了限制。在这里，我们开发了一种新型的钴 - 碳基 SAC，其源自浸泡在 Co 中的废咖啡渣的温和热解（Co-CGBC），其中钴原子以原子方式分散并与碳物质中的 N 和 S 原子配位，如通过 X 射线吸收精细结构 (XAFS) 光谱结合高角度环形暗场扫描透射电子显微镜 (HAADF-STEM) 鉴定。Co-CGBC 价格低廉，在活化过硫酸盐 (PMS) 方面表现出很高的效率，可降解多种有机污染物，降解效率为 90-100%。₃ S ₁活性位点在降低PMS的吸附能和促进电子转移方面起着至关重要的作用。这项工作为合成具有成本效益的 SAC 用于环境修复提供了新的机会。

更新日期：2021-10-08

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