Facile template synthesis of dumbbell-like Mn2O3 with oxygen vacancies for efficient degradation of organic pollutants by activating peroxymonosulfate,Catalysis Science & Technology

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Facile template synthesis of dumbbell-like Mn2O3 with oxygen vacancies for efficient degradation of organic pollutants by activating peroxymonosulfate
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020/01/04 , DOI: 10.1039/c9cy01849b
Yang Li _{1,

2,

3,

4,

5} , Didi Li _{1,

2,

3,

4,

5} , Shisuo Fan _{6,

7,

8,

9} , Ting Yang _{9,

10,

11,

12} , Qi Zhou _{9,

13,

14,

15}

Affiliation

Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control
School of Environmental Science and Engineering
Institute of Environmental Health and Pollution Control
Guangdong University of Technology
Guangzhou 510006
School of Resources and Environment
Anhui Agricultural University
Hefei 230036
China
College of Life and Environmental Sciences
Minzu University of China
Beijing 100081
College of chemistry and chemical engineering
Anhui University
Hefei 230601

In this work, novel dumbbell-like Mn₂O₃ was prepared using a low-cost and environmentally friendly template (gelatin) and applied to activate peroxymonosulfate (PMS) for pollutant degradation. The characterization results showed that dumbbell-like microstructures were formed by the self-assembly of tiny nanoparticles. Mn₂O₃-G (gelatin as the template) as a heterogeneous catalyst for PMS activation could effectively degrade various pollutants and exhibited an excellent degradation rate of rhodamine B (0.2333 min⁻¹, in 30 min) for PMS activation compared to Mn₂O₃-C (carboxymethyl cellulose as the template), Mn₂O₃-N (without a template), and MnO₂. The superior catalytic performance of Mn₂O₃-G was ascribed to its high oxygen vacancy content. The radical scavenging and EPR experiments revealed that SO₄˙⁻, OH˙, O₂˙⁻, and ¹O₂ were identified as reactive species generated from PMS activation. The oxygen vacancies participated in the generation of the reactive species. Thus, a facile and environmentally friendly method is provided for the synthesis of dumbbell-like Mn₂O₃ as a high-efficiency catalyst for PMS activation. Furthermore, this study shows a new mechanistic insight into PMS activation on Mn₂O₃.

中文翻译：

氧空位的哑铃状Mn2O3的简便模板合成，可通过活化过氧一硫酸盐有效降解有机污染物

在这项工作中，使用低成本且环保的模板（明胶）制备了新颖的哑铃状Mn ₂ O ₃，并将其用于活化过氧单硫酸盐（PMS）来降解污染物。表征结果表明，哑铃状微结构是由微小纳米颗粒的自组装形成的。的Mn ₂ ø ₃ -G（明胶作为模板），作为活化PMS的非均相催化剂可以有效地降解各种污染物并表现出若丹明B的一个极好的降解率（0.2333分钟^-1为PMS活化，在30分钟内）相比的Mn ₂ O ₃ -C（以羧甲基纤维素为模板），Mn ₂ O ₃-N（无模板）和MnO ₂。Mn ₂ O ₃ -G的优异催化性能归因于其高的氧空位含量。所述自由基清除和EPR实验表明SO ₄ ˙ ^-，OH，O- ₂ ˙ ^-，和¹ ö ₂被确定为从PMS激活产生反应性物种。氧空位参与了反应性物种的产生。因此，提供了一种容易且环保的方法来合成哑铃状Mn ₂ O _3。作为PMS活化的高效催化剂。此外，这项研究显示了对PMS在Mn ₂ O ₃上活化的新机制。

更新日期：2020-02-13

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