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以钛酸四丁酯、硝酸铋为原料,采用水热法制备铋掺杂TiO2光催化剂(Bi-TiO2)。所得材料用X射线衍射、透射电子显微镜、X射线能谱、X射线荧光光谱、UV–Vis漫反射等测试手段分析。结果显示水热法可以直接合成锐钛型纳米TiO2。铋在TiO2中的掺杂方式为Bi3+替位取代TiO2中Ti4+。样品具有较大的比表面积,其最大达31.2 m2/g。铋掺杂能引起TiO2光催化剂的吸收光谱明显红移,从而具备较好的可见光响应性。以降解间苯二酚为探针反应研究其可见光催化性能,纯TiO2光催化活性极低,而Bi-TiO2具有较高的可见光催化性能,当铋掺杂量为1.00%时光催化性能最佳。UV–Vis光谱和高效液相色谱显示间苯二酚在70W金卤灯下反应120min能完全分解。
Bismuth doped TiO2 photocatalyst (Bi-TiO2) was prepared by hydrothermal method using tetrabutyl titanate and bismuth nitrate as raw materials. The obtained material was analyzed by X-ray diffraction, transmission electron microscopy, X-ray energy dispersive spectroscopy, X-ray fluorescence spectroscopy, UV-Vis diffuse reflectance and other test methods. The results show that the hydrothermal method can be directly synthesized anatase nano-TiO2. The bismuth doped in TiO2 is replaced by Bi3 + for Ti4 + in TiO2. The sample has a large specific surface area up to 31.2 m2 / g. Bismuth doping can cause the absorption spectrum of TiO2 photocatalysts significantly red shift, which has better visible light response. Biodegradation of resorcinol as a probe reaction of visible light catalytic properties of pure TiO2 photocatalytic activity is very low, and Bi-TiO2 has high visible light catalytic properties, when the bismuth doping amount of 1.00% best photocatalytic performance. UV-Vis spectroscopy and high performance liquid chromatography showed that resorcinol could decompose completely under 70W metal halide lamp for 120 minutes.