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Materials 2016, 9(10), 849; doi:10.3390/ma9100849

Synthesis and Characterization of N-Doped Porous TiO2 Hollow Spheres and Their Photocatalytic and Optical Properties

1
Institute of Materials for Energy and Environment, Qingdao University, Qingdao 266071, China
2
Laboratory of New Fiber Materials and Modern Textile, Growing Basis for State Key Laboratory, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China
3
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
4
School of Chemical Engineering, The University of Queensland, St Lucia, Brisbane QLD 4072, Australia
*
Authors to whom correspondence should be addressed.
Academic Editor: George Zhao
Received: 28 August 2016 / Revised: 4 October 2016 / Accepted: 11 October 2016 / Published: 19 October 2016
(This article belongs to the Special Issue Porous Materials for Water Technology)
View Full-Text   |   Download PDF [7297 KB, uploaded 19 October 2016]   |  

Abstract

Three kinds of N-doped mesoporous TiO2 hollow spheres with different N-doping contents, surface area, and pore size distributions were prepared based on a sol–gel synthesis and combined with a calcination process. Melamine formaldehyde (MF) microspheres have been used as sacrificial template and cetyltrimethyl ammonium bromide (CTAB) or polyvinylpyrrolidone (PVP) was selected as pore-directing agent. Core–shell intermediate spheres of titania-coated MF with diameters of 1.2–1.6 μm were fabricated by varying the volume concentration of TiO2 precursor from 1 to 3 vol %. By calcining the core–shell composite spheres at 500 °C for 3 h in air, an in situ N-doping process occurred upon the decomposition of the MF template and CTAB or PVP pore-directing surfactant. N-doped mesoporous TiO2 hollow spheres with sizes in the range of 0.4–1.2 μm and shell thickness from 40 to 110 nm were obtained. The composition and N-doping content, thermal stability, morphology, surface area and pore size distribution, wall thickness, photocatalytic activities, and optical properties of the mesoporous TiO2 hollow spheres derived from different conditions were investigated and compared based on Fourier-transformation infrared (FTIR), SEM, TEM, thermogravimetric analysis (TGA), nitrogen adsorption–desorption, and UV–vis spectrophotoscopy techniques. The influences of particle size, N-doping, porous, and hollow characteristics of the TiO2 hollow spheres on their photocatalytic activities and optical properties have been studied and discussed based on the composition analysis, structure characterization, and optical property investigation of these hollow spherical TiO2 matrices. View Full-Text
Keywords: mesoporous TiO2 hollow spheres; MF microsphere template; photocatalytic properties; optical properties mesoporous TiO2 hollow spheres; MF microsphere template; photocatalytic properties; optical properties
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Li, H.; Liu, H.; Fu, A.; Wu, G.; Xu, M.; Pang, G.; Guo, P.; Liu, J.; Zhao, X.S. Synthesis and Characterization of N-Doped Porous TiO2 Hollow Spheres and Their Photocatalytic and Optical Properties. Materials 2016, 9, 849.

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