Characterization and photocatalytic activity of titanium dioxide powder treated with PH3 gas
Characterization and photocatalytic activity of titanium dioxide powder treated with PH3 gas
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DOI：
10.1016/j.matchemphys.2021.125644
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发表时间：
2021-12
影响因子：
4.6
通讯作者：
Keiji Yamada;H. Taniguchi;Akihiro Yanagi;S. Nagata;H. Wakita;T. Kurisaki
中科院分区：
文献类型：
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作者：
Keiji Yamada;H. Taniguchi;Akihiro Yanagi;S. Nagata;H. Wakita;T. Kurisaki
对金属氧化物进行氮掺杂的 NH3 处理被广泛用作窄化带隙的方法。然而，二氧化钛（TiO2）粉末的PH3处理尚未建立。在本研究中，尝试通过在密封安瓿中加热 TiO2 粉末和固态次磷酸钠来对 TiO2 进行 PH3 处理。粉末的颜色从未经处理的 TiO2 的无色变为在 250、290、350 °C 下处理的 TiO2 的米色，或在 450 °C 下处理的 TiO2 的灰色。对处理后的 TiO2 进行 X 射线光电子能谱 (XPS) 分析表明，磷以磷酸盐形式存在，并且 TiO2 中的部分 Ti4+ 被还原为 Ti3+。吸收光谱和XPS数据表明氧空位的产生。亚甲基蓝和曙红Y在处理过的TiO2上的吸附实验表明TiO2表面存在磷酸盐。 X射线衍射(XRD)分析表明，处理后的TiO2的晶粒尺寸随着温度的升高而增大。经处理的 TiO2 在紫外光下对颜料的光降解率取决于磷酸盐、氧空位和结晶度。研究发现，与氮掺杂的 NH3 处理相比，结晶 TiO2 的 PH3 处理优先形成磷酸盐。
NH3treatment for nitrogen doping to metal oxides is widely used as a method of band gap narrowing. However, PH3treatment of titanium dioxide(TiO2) powders has not yet been established. In the present study, PH3treatment of TiO2was attempted by heating TiO2powders and solid-state sodium hypophosphite in a sealed ampoule. The color of the powders changed from colorless for untreated TiO2to beige for TiO2treated at 250, 290, 350 °C, or to gray for TiO2treated at 450 °C. X-ray photoelectron spectroscopy (XPS) analysis of the treated TiO2revealed that the phosphorus was in a phosphate form and that a part of Ti4+in TiO2was reduced to Ti3+. The absorption spectra and the XPS data suggested the generation of oxygen vacancies. Adsorption experiments of methylene blue and Eosin Y onto the treated TiO2indicated the presence of phosphate on the surface of TiO2. X-ray diffraction (XRD) analysis indicated that the crystallite sizes of the treated TiO2increased with increasing in temperature. Photodegradation rates of the pigments by the treated TiO2under UV light depended on phosphate, oxygen vacancy and crystallinity. PH3treatment of crystalline TiO2were found to give priority to phosphate formation in contrast to NH3treatment for nitrogen doping.