在石墨烯氧化物中低协调的Mn-N2位点诱导过氧化硫酸盐激活,用于四环素降解:过程优化和理论计算
Yuan Ouyang1, Meifang Li1, Chunfang Tang1
1College of Life and Environmental Sciences, Central South University of Forestry and Technology, Shaoshan South Road, Tianxin District, Changsha 410004, China.
Environmental research
|July 17, 2024
概括
这项研究引入了一种新型的单原子催化剂 (Mn-SA/NGO),用于高效的过氧化硫酸盐 (PDS) 激活,从而在水中实现完全去除四环素 (TC). 催化剂在环境修复方面表现出稳定性和有效性.
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:
- 原子分散低协调过渡金属-Nx催化剂在环境修复中对过氧化硫酸盐 (PDS) 激活是有效的.
- 催化性能通常受到金属-N协调号和单原子负荷的限制.
研究的目的:
- 为了合成低协调配合的石墨烯氧化物 (GO) 局限单原子Mn催化剂 (Mn-SA/NGO).
- 为了评估其在降解四环素 (TC) 的效率,使用PDS进行水处理.
- 研究开发的催化剂的催化机制和稳定性.
主要方法:
- 化盐辅助热解用于Mn-SA/NGO合成.
- 偏差校正高角度环状暗场扫描传输电子显微镜 (AC-HAADF-STEM) 和X射线吸收细结构光谱 (XAFS) 用于表征.
- 盒式设计用于优化反应参数.
- 密度函数理论 (DFT) 计算用于机械洞察力.
主要成果:
- 成功合成了Mn-SA/NGO,单原子Mn负荷为1.6%,Mn-N2位点协调性较低.
- 在优化条件下实现了100%的TC去除.
- 证明了强大的抗干扰能力,良好的重复使用性和稳定性.
- 确定了O2•−,OH和1O2作为主要活性物种,具有85.1%的TC矿化.
- DFT计算证实了由单原子 Mn 增强的 PDS 吸附和激活.
结论:
- Mn-SA/NGO是PDS激活和TC降解的高效催化剂.
- 这种催化剂对实际的环境修复应用非常有希望.
- 这项工作为设计用于抗生素去除的高性能单原子催化剂提供了参考.
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