Effects of vanadium doping on microstructures and optical properties of TiO2
Effects of vanadium doping on microstructures and optical properties of TiO2
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钒掺杂对TiO2微观结构和光学性能的影响
DOI：
10.1016/j.ceramint.2016.10.132
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发表时间：
2017
影响因子：
5.2
通讯作者：
Tao Xu
中科院分区：
文献类型：
--
作者：
Tong Wang;Tao Xu
为了提高二氧化钛(TiO2光催化剂)的光催化活性，选择了钒(V)对其进行改性。首先合成了纯的和掺V的二氧化钛样品，然后用X射线衍射仪、透射电子显微镜和高分辨电子显微镜、X射线光电子能谱和紫外可见漫反射光谱研究了钒掺杂对二氧化钛微结构和光学性能的影响。结果表明，制得的二氧化钛样品中只有锐钛矿相。钒掺杂均匀分散在二氧化钛晶格中，不影响二氧化钛的晶相结构。在12~16 nm范围内，随着V掺杂量的增加，二氧化钛的微晶尺寸呈现先减小后增大的趋势。V掺杂抑制了TiO2微晶尺寸的增大。纳米二氧化钛的分散性随着钒掺杂含量的增加而提高。V掺杂在TiO2晶格中引入了更多的缺陷来捕获载流子，减少了电子-空穴对的复合。此外，所制备的二氧化钛还含有钛、钒和氧(O)等元素。V由V4+和V5+两种化学态组成，它们作为光生电子的捕获中心，促进了光催化氧化过程。在掺V的二氧化钛中，钛以Ti4+的形式存在，氧以Ti-O、Ti-OH、Ti-O-V等化学键的形式存在。最后，掺V的TiO2的光吸收边出现了明显的红移。对于纯的二氧化钛样品，V的最佳掺杂量为1.0%。V掺杂可以引入掺杂能级，使二氧化钛的禁带宽度变窄，扩大了二氧化钛的吸收光谱范围。V掺杂是改善TiO2在可见光区域光吸收性能的有效方法。
To improve the photocatalytic activity of titanium dioxide (TiO2), the vanadium (V) was selected to modify TiO2. Pure and V-doped TiO2samples were first synthesized, then effects of the V doping on microstructures and optical properties of TiO2were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM) and high resolution TEM (HRTEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible light diffuse reflectance spectra (UV–vis DRS). Results indicated that the prepared TiO2samples only contained anatase phase. The V dopant was uniformly dispersed in TiO2lattices, not affecting the crystal phase structures of TiO2. The crystallite sizes of TiO2were decreased first and then increased with the increase in V dopant content within the diameter range from 12 to 16 nm. The V dopant inhibited the increase in TiO2crystallite size. Also, the dispersity of TiO2nanoparticles was improved with the increase in V dopant content. The V doping brought more defects in TiO2lattices to capture charge carriers, and to decrease the recombination of electron–hole pairs. Additionally, the prepared TiO2included such elements as Ti, V and oxygen (O). V consisted of two chemical states of V4+and V5+, which were served as trapping centers of photo-generated electrons to promote the photocatalytic oxidation process. Ti existed in the form of Ti4+, and O presented in the form of such chemical bonds as Ti-O, Ti-OH and Ti-O-V in V-doped TiO2. Finally, the optical absorption edges of V-doped TiO2show obvious red shift. The optimal V dopant content is 1.0% for pure TiO2sample. The V dopant could introduce the doping energy level and narrow the band gap of TiO2, extending the absorption spectral range of TiO2. The V doping was an effective method to improve optical absorption properties of TiO2in visible light region.
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DOI：
10.1164/ajrccm.162.4.9909096
发表时间：
2000-10
影响因子：
24.7
作者：
W. Gauderman;Rob M C Connell;F. Gilliland;Stephanie A. London;Duncan C. Thomas;E. Avol;Hita Vora;K. Berhane;E. Rappaport;F. Lurmann;H. Margolis;J. Peters;J. Gauderman
通讯作者：
W. Gauderman;Rob M C Connell;F. Gilliland;Stephanie A. London;Duncan C. Thomas;E. Avol;Hita Vora;K. Berhane;E. Rappaport;F. Lurmann;H. Margolis;J. Peters;J. Gauderman
影响因子：
3.7
作者：
A. Emeline;N. Sheremetyeva;N. V. Khomchenko;V. Ryabchuk;N. Serpone
通讯作者：
A. Emeline;N. Sheremetyeva;N. V. Khomchenko;V. Ryabchuk;N. Serpone
影响因子：
6.9
作者：
Yan Wang;Yiming He;Qinghua Lai;M. Fan
通讯作者：
Yan Wang;Yiming He;Qinghua Lai;M. Fan
DOI：
10.1164/rccm.2111021
发表时间：
2002-07-01
影响因子：
24.7
作者：
Gauderman, WJ;Gilliland, GF;Peters, JM
通讯作者：
Peters, JM
影响因子：
22.1
作者：
B. Henkel;T. Neubert;Sebastian Zabel;C. Lamprecht;C. Selhuber‐Unkel;K. Rätzke;T. Strunskus;M. Ver
通讯作者：
B. Henkel;T. Neubert;Sebastian Zabel;C. Lamprecht;C. Selhuber‐Unkel;K. Rätzke;T. Strunskus;M. Ver