Interfacial engineering coupling with tailored oxygen vacancies in Co2Mn2O4 spinel hollow nanofiber for catalytic phenol removal

Fu Yang; Yutong Lu; Xuexue Dong; Mengting Liu; Zheng Li; Xuyu Wang; Lulu Li; Chengzhang Zhu; Wuxiang Zhang; Chao Yu; Aihua Yuan

doi:10.1016/j.jhazmat.2021.127647

Interfacial engineering coupling with tailored oxygen vacancies in Co₂Mn₂O₄ spinel hollow nanofiber for catalytic phenol removal

J Hazard Mater. 2022 Feb 15;424(Pt C):127647. doi: 10.1016/j.jhazmat.2021.127647. Epub 2021 Oct 30.

Authors

Fu Yang¹, Yutong Lu², Xuexue Dong², Mengting Liu², Zheng Li³, Xuyu Wang⁴, Lulu Li², Chengzhang Zhu², Wuxiang Zhang², Chao Yu⁵, Aihua Yuan⁶

Affiliations

¹ School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, PR China; Jiangsu Agricultural Hormone Engineering Technology Research Center Co. LTD, Changzhou 213022, Jiangsu, PR China. Electronic address: fuyang@just.edu.cn.
² School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, PR China.
³ School of Physics, Peking University, Beijing 100817, PR China.
⁴ School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, PR China; Huizhou Research Institute of Sun Yat-sen University, Huizhou, PR China.
⁵ School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, PR China. Electronic address: chao_yu@just.edu.cn.
⁶ School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, PR China. Electronic address: aihua.yuan@just.edu.cn.

PMID: 34775318
DOI: 10.1016/j.jhazmat.2021.127647

Abstract

Herein, one-dimensional Co₂Mn₂O₄ (CMO) hollow nanofibers with a general spinel structure were constructed by electrospinning and tunning thermal-driven procedures. The resultant catalyst was endowed with appreciable active interfacial engineering effect, which revealed improved peroxymonosulfate (PMS) activation efficiency in catalytic phenol degradation with nearly 12.9 folds increment in reaction rate constant compared to the hydrothermally synthesized counterpart. Besides, tailored oxygen-vacancy sites including chemical environment and contents in the bimetallic spinel were rationally validated compared to the monometal spinel counterparts. The improved catalytic phenol degradation by reactive-oxidative-species (ROS) from PMS was well correlated with the more active Co(II) and Mn(II) species, reactive active oxygen-vacancy and the interfacial engineering effect in the CMO catalyst. These correlations were comprehensively demonstrated by various characterization techniques, catalytic results, and Density-Functional-Theoretical (DFT) calculations of the adsorption and activation of PMS. Besides, the results revealed that the specific content of cobalt species in the structural unit of the Co₂Mn₂O₄ spinel resulting from the optimized thermal treatment could further improve the catalytic activity by the intermetallic synergy along with the beneficial electron transfer cycles. This work provides a practical understanding of the improvement of interfacial systems in catalysis efficiency and environmental remediation.

Keywords: Advanced oxidation process; Electrospinning; Hollow nanofiber; Interfacial engineering; Synergetic effect.