Three-dimensional MnO2porous hollow microspheres for enhanced activity as ozonation catalysts in degradation of bisphenol A.
Three-dimensional (3D) MnO2porous hollow microspheres (δ- and α- MnO2PHMSs), with high adsorption and catalytic ozonation performance, were synthesized by a self-template (MnCO3microspheres) process at room temperature. The synthesized MnO2PHMSs 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 O3molecules on catalyst. Moreover, the catalytic performance of α-MnO2PHMSs was better than that of δ-MnO2PHMSs which was attributed to the richer lattice oxygen of α-MnO2PHMSs to accelerate O3decomposition by producing more reactive oxidative species. The degradation efficiency of BPA using 3D α-MnO2PHMSs 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.
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Xiuqin
X
Tan
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Yifeng
Y
Wan
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Yajing
Y
Huang
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.
Chun
C
He
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Zaili
Z
Zhang
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Zhuoyan
Z
He
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Lingling
L
Hu
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Jiawei
J
Zeng
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.
Dong
D
Shu
Bisphenol A; Catalytic ozonation; MnO(2) hollow microspheres; Three-dimensional