N,Al共掺杂TiO_2纳米材料的制备及其可见光降解葛根素

Preparation of N,Al Co-doped TiO_2 Nanomaterial and Its Visible Light Degradation Property for Puerarin

采用固相反应法合成了Al掺杂TiO2(Al-TiO2)及N与Al共掺杂TiO2(N-Al-TiO2)纳米材料,采用XRD、SEM、UV-Vis DRS、XPS、Raman以及N2吸附-脱附等手段对材料进行了物相结构表征。同时考察了可见光辐照下催化剂对葛根素降解性能。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TiO2晶格,形成N—Ti键,Al3+以同晶取代方式占据TiO2晶格中Ti的位置;其表面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;并对葛根素显示出很高的可见光降解活性,2 h对葛根素的降解率达92.7%。3种材料对葛根素的吸附容量与其对葛根素的可见光降解能力一致,依次为N-Al-TiO2>纯TiO2>Al-TiO。

TiO2 nanomaterial doped with N and Al（N-Al-TiO2）,and TiO2 nanomaterial doped with Al（Al-TiO2） were synthesized through a solid-state reaction route.The textural properties of the materials were characterized by means of X-ray diffraction（XRD）,scanning electron microscopy（SEM）,UV-Vis DRS,X-ray photoelectron spectroscopy（XPS）,Raman and N2 adsorption-desorption.The photodegradation properties of the catalyst on puerarin under the irradiation of visible light were investigated.The results show that the microscopic image of N-Al-TiO2 nanomaterial with anatase phase is in the shape of a short rod.N atoms in the form of N3-were incorporated into the lattice of TiO2,forming the N-Ti bond;and Al ions replaced Ti in the crystal lattice of TiO2 by isomorphous replacement.The atomic percent（%） of N,Al,Ti and O in N-Al-TiO2 nanomaterial is 7.8,3.6,32.7 and 55.9,respectively,and a stronger visible light degradation activity on the N-Al-TiO2 nanomaterial was found in the puerarin solution.Within 2 h,the puerarin degradation ratio reached 92.7%.And there was a positive correlation between the adsorption capacity and visible light degradation activity of the materials,which forms a descending order as follows：N-Al-TiO2TiO2Al-TiO2.