SPECTROSCOPIC, PHOTOCONDUCTIVITY, AND PHOTOCATALYTIC STUDIES OF TIO2 COLLOIDS - NAKED AND WITH THE LATTICE DOPED WITH CR3+, FE3+, AND V5+ CATIONS
SPECTROSCOPIC, PHOTOCONDUCTIVITY, AND PHOTOCATALYTIC STUDIES OF TIO2 COLLOIDS - NAKED AND WITH THE LATTICE DOPED WITH CR3+, FE3+, AND V5+ CATIONS
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DOI：
10.1021/la00015a010
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发表时间：
1994-03-01
期刊：
影响因子：
3.9
通讯作者：
HERRMANN, JM
中科院分区：
文献类型：
--
作者：
SERPONE, N;LAWLESS, D;HERRMANN, JM
采用低温（0℃）水解法制备了二氧化钛胶体颗粒；在晶格中掺杂Cr3+（0.5、5和10 wt% -相对于TiO2的重量-来自水相CrCl3）、Fe3+ （10 wt%来自水相FeCl3）和V5+ （10 wt%来自水相NH4VO3）的TiO2颗粒也通过类似的方法合成。这些颗粒通过光谱和光电导率测量来评估掺入金属掺杂剂对钛（锐钛矿）的光敏性。金属掺杂颗粒中的可见吸收带与在所有掺杂水平（高达20wt %）下观察到的水性金属阳离子的吸收带平行；除了TiO2体系的吸收阈值外，这些波段在光电导率与波长的作用谱中没有重现。通过标准光还原（水，H-2演化）和光氧化（草酸）反应来测定它们的光催化活性，以评估金属掺杂对非均相光催化的影响。
Colloidal TiO2 particulates have been prepared using a low-temperature (0-degrees-C) method by controlled hydrolysis of TiCl4; TiO2 particulates doped in the lattice with Cr3+ (0.5, 5, and 10 wt % -relative to weight of TiO2-from aqueous CrCl3), with Fe3+ (10 wt % from aqueous FeCl3) and with V5+ ( 10 wt% from aqueous NH4VO3) were also synthesized by an analogous procedure. These particulates were examined spectroscopically and by photoconductivity measurements to assess the photosensitization of titania (anatase) by incorporated metal dopants. Visible absorption bands in metal-doped particulates parallel those observed for aqueous metal cations at all levels of doping (up to 20 wt %); these bands are not reproduced in the action spectra of photoconductivity vs wavelength, except for the absorption threshold of the TiO2 system in all cases. Their photocatalytic activity was determined by standard photoreduction (of water, H-2 evolution) and photooxidation (of oxalic acid) reactions to assess the influence of metal dopants in heterogeneous photocatalysis.