Three-dimensional MnO2 porous hollow microspheres for enhanced activity as ozonation catalysts in degradation of bisphenol A

Xiuqin Tan; Yifeng Wan; Yajing Huang; Chun He; Zaili Zhang; Zhuoyan He; Lingling Hu; Jiawei Zeng; Dong Shu

doi:10.1016/j.jhazmat.2016.09.013

Three-dimensional MnO₂ porous hollow microspheres for enhanced activity as ozonation catalysts in degradation of bisphenol A

J Hazard Mater. 2017 Jan 5:321:162-172. doi: 10.1016/j.jhazmat.2016.09.013. Epub 2016 Sep 5.

Authors

Xiuqin Tan¹, Yifeng Wan¹, Yajing Huang¹, Chun He², Zaili Zhang¹, Zhuoyan He¹, Lingling Hu¹, Jiawei Zeng¹, Dong Shu³

Affiliations

¹ School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
² School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, China. Electronic address: hechun@mail.sysu.edu.cn.
³ Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China. Electronic address: dshu@scnu.edu.cn.

PMID: 27619962
DOI: 10.1016/j.jhazmat.2016.09.013

Abstract

Three-dimensional (3D) MnO₂ porous hollow microspheres (δ- and α- MnO₂ PHMSs), with high adsorption and catalytic ozonation performance, were synthesized by a self-template (MnCO₃ microspheres) process at room temperature. The synthesized MnO₂ PHMSs were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) surface area. The results showed that PHMSs exhibit the excellent adsorption ability and catalytic activity owning to their hollow spherical structure, mesoporous shell and well-defined interior voids, leading to the strong adsorption for bisphenol A (BPA) and the retention of O₃ molecules on catalyst. Moreover, the catalytic performance of α-MnO₂ PHMSs was better than that of δ-MnO₂ PHMSs which was attributed to the richer lattice oxygen of α-MnO₂ PHMSs to accelerate O₃ decomposition by producing more reactive oxidative species. The degradation efficiency of BPA using 3D α-MnO₂ PHMSs was more than 90% in the presence of ozone within 30min reaction time. The probe tests for reactive oxidative species (ROSs) displayed that BPA degradation by catalytic ozonation is dominated by O₂^- and OH in our present study. Furthermore, the organic compounds as intermediates of the degradation process were identified by LC/MS.

Keywords: Bisphenol A; Catalytic ozonation; MnO(2) hollow microspheres; Three-dimensional.