N, Al共掺杂TiO2纳米材料的制备及其可见光降解性能

Preparation of N, Al Co-doped TiO2 Nanomaterial and Its Visible Light Degradation Property

摘要:

固相反应法合成了铝掺杂二氧化钛(Al-TiO2)及氮与铝共掺杂二氧化钛（N-Al-TiO2）纳米材料，采用XRD、SEM、UV-Vis、XPS等手段对材料进行了物相结构表征。同时研究了可见光辐照下催化剂对葛根素降解性能。结果表明，N-Al-TiO2纳米材料的微观形貌为短棒形；氮以阴离子（N3-）形式取代氧进入二氧化钛晶格，Al3 以同晶取代方式占据TiO2晶格中Ti的位置. 材料表面N、Al、Ti及O的原子百分比组成(%)分别为7.8, 3.6, 32.7和55.9。N-Al-TiO2纳米材料的紫外吸光强度比纯TiO2与Al-TiO2大。对葛根素的降解显示出很高的可见光活性，其可见光降解葛根素的能力依次为N-Al-TiO2＞纯TiO2＞Al-TiO2。

Abstract:

N and Al co-doped TiO2 nanomaterial (N-Al-TiO2) and Al-doped TiO2 material are synthesized through a solid-state reaction route. The textural properties of the samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet visible light spectroscopy (UV-Vis) and X-ray photoelectron spectroscopy (XPS). The photo- degradation properties of puerarin on the materials from irradiating with visible light are investigated. It clearly shows that the microscopic structure of N-Al-TiO2 nanomaterial with crystal anatase phase is a short-rod shape. N atoms as N3- states have been incorporated into the lattice of TiO2 or have been entered into the interstice of TiO2 lattice. Al ions occupy the sites of Ti in crystal lattice by isomorphous replacement. The percent content (%) of atoms such as N, Al, Ti and O in N-Al-TiO2 nanomaterial is 7.8, 3.6, 32.7 and 55.9, respectively. Moreover, the UV-Vis absorption intensity of N-Al-TiO2 nanomaterial is higher rather than that of pure TiO2 and Al-TiO2 materials. Enjoyably, The visible light degradation activity for puerarin is presented as follows as N-Al-TiO2＞TiO2＞Al-TiO2.