title: Directed synthesis of hierarchical nanostructured TiO2 catalysts and their morphology-dependent photocatalysis for phenol degradation.
abstract: Nanostructured TiO2 with different hierarchical morphologies were synthesized via a warmly hydrothermal route. The properties of the products were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, N2 adsorption, UV-vis spectroscopy, etc. Two of the products, TiO2 1D nanorods (one-dimensional rutile TiO2 nanorods) and TiO2 3D0D microspheres (three-dimensional anatase TiO2 nanoparticle-assembled microspheres) exhibited superior photocatalytic effects on phenol degradation under UV illumination, compared with TiO2 3D1D microspheres (three-dimensional rutile TiO2 nanorods-assembled microspheres). Moreover, TiO2 3D0D was superior to TiO2 1D, as indicated by a 30% higher mineralization of dissolved phenol. Dihydroxybenze, 4,4'-dihydroxybiphenyl, benzoquinone, maleic anhydride, etc. were identified as the degradation intermediates. The excellent catalytic effect was attributed to the structural features of TiO2 1D nanorods and TiO2 3D0D microspheres, that is, a larger amount of surface active sites and a higher band gap energy resulted in more efficient decomposition of organic contaminants.
authors.affiliation: Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071, China. liul@nankai.edu.cn
authors.forename: Lu
authors.initials: L
authors.lastname: Liu
authors.forename: Huajie
authors.initials: H
authors.lastname: Liu
authors.forename: Ya-Ping
authors.initials: YP
authors.lastname: Zhao
authors.forename: Yuqiu
authors.initials: Y
authors.lastname: Wang
authors.forename: Yueqin
authors.initials: Y
authors.lastname: Duan
authors.forename: Guandao
authors.initials: G
authors.lastname: Gao
authors.forename: Ming
authors.initials: M
authors.lastname: Ge
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
mesh_terms: D002384:Catalysis; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures; D010636:Phenols / Q000737:chemistry*; D010777:Photochemistry; D013056:Spectrophotometry, Ultraviolet; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D010636:Phenols; C009495:titanium dioxide; D014025:Titanium