期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 42, 期 7, 页码 2342-2348出版社
AMER CHEMICAL SOC
DOI: 10.1021/es070980o
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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, N-2 adsorption, UV-vis spectroscopy, etc. Two of the products TiO2 1D nanorods (one-dimensional rutile TiO2 nanorods) and TiO2 3D(0D) microspheres (three-dimensional anatase TiO2 nanoparticle assemble:d microspheres) exhibited superior photocatalytic effects on phenol degradation under UV illumination, compared with TiO2 3D(1D) microspheres (three-dimensional rutile TiO2 nanorods-assembled microspheres). Moreover, TiO2 3D(0D) 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 3D(0D) microspheres, that is, a larger amount of surface active sites and a higher band gap energy resulted in more efficient decomposition of organic contaminants.
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