Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 321, Issue -, Pages 162-172Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.09.013
Keywords
Bisphenol A; Catalytic ozonation; MnO2 hollow microspheres; Three-dimensional
Categories
Funding
- National Natural Science Foundation of China [51578556, 21273085, 21673086]
- Natural Science Foundation of Guangdong Province [2015A030308005, S2013010012927, S2011010003416]
- Science and Technology Research Programs of Guangdong Province [2014A020216009]
- Fundamental Research Funds for the Central Universities [13lgjc10]
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Three-dimensional (3D) MnO2 porous hollow microspheres (delta- and alpha-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 O-3 molecules on catalyst. Moreover, the catalytic performance of alpha-MnO2 PHMSs was better than that of delta-MnO2 PHMSs which was attributed to the richer lattice oxygen of alpha-MnO2 PHMSs to accelerate O-3 decomposition by producing more reactive oxidative species. The degradation efficiency of BPA using 3D alpha-MnO2 PHMSs was more than 90% in the presence of ozone within 30 min reaction time. The probe tests for reactive oxidative species (ROSs) displayed that BPA degradation by catalytic ozonation is dominated by O-center dot(2)- and (OH)-O-center dot in our present study. Furthermore, the organic compounds as intermediates of the degradation process were identified by LC/MS. (C) 2016 Elsevier B.V. All rights reserved.
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