Shindume L Hamukwaya, Zhao Zengying, Wang Ning, Liu Hu, Umar Ahmad, Zhang Jiaoxia, Wu Tingting, Guo Zhanhu
School of Science, China University of Geosciences, Beijing 100083, China.
State Key Laboratory of Marine Resource Utilization in South China Sea, College of Materials and Chemical Engineering, Hainan University, Haikou 570100, China.
J Nanosci Nanotechnol. 2019 Feb 1;19(2):839-849. doi: 10.1166/jnn.2019.15745.
B, N-codoped titania mesoporous crystals were prepared by the sol-gel method followed by a molten nitrate process to modify the sample morphology. The composition, morphology and microstructure of the obtained samples were characterized by X-ray diffraction (XRD), X-ray photoemission spectroscope (XPS), Brunauer Emmett Teller (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). Fourier Transform Infrared spectroscopy (FTIR) revealed weak complex vibrations between the Ti-O oxide species and the unsaturated sites (Ti) through the incorporation of hydroxyl groups, which was not observed in the bulk titania (B-N-TiO₂). The photocatalytic reactivity of boron-nitrogen codoped TiO₂ was examined for the removal of methylene blue (MB) under visible light irradiation. The nitrates treated B-doped TiO₂ exhibited better photocatalytic activity for dye degradation than that of B-doped TiO₂ and nitrates treated TiO₂. The best performance was obtained in the sample treated at a calcination temperature of 550 °C.
B，通过溶胶-凝胶法制备了N共掺杂的二氧化钛介孔晶体，随后采用熔融硝酸盐工艺来改变样品的形貌。通过X射线衍射（XRD）、X射线光电子能谱（XPS）、布鲁诺尔-埃米特-泰勒（BET）法、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和选区电子衍射（SAED）对所得样品的组成、形貌和微观结构进行了表征。傅里叶变换红外光谱（FTIR）表明，通过引入羟基，Ti-O氧化物物种与不饱和位点（Ti）之间存在微弱的复合振动，而在块状二氧化钛（B-N-TiO₂）中未观察到这种现象。研究了硼氮共掺杂二氧化钛在可见光照射下对亚甲基蓝（MB）的光催化反应活性。硝酸盐处理的B掺杂二氧化钛对染料降解表现出比B掺杂二氧化钛和硝酸盐处理的二氧化钛更好的光催化活性。在550℃煅烧温度下处理的样品中获得了最佳性能。
