Fan Xianyuan, Liu Hong, Song Weikun, Chang Chia-Yuan
Department of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan 430081, China.
Materials (Basel). 2021 May 5;14(9):2404. doi: 10.3390/ma14092404.
A novel Ba(II)/TiO-MCM-41 composite was synthesized using binary mixtures with Ba/TiO and MCM-41, and Ba as a doping ion of TiO. The specific surface area and pore structure characterizations confirm that a mesoporous structure with a surface area of 341.2 m/g and a narrow pore size distribution ranging from 2 to 4 nm was achieved using Ba(II)/TiO-MCM-41. Ba(II)/TiO particles were synthesized into 10-15 nm particles and were well dispersed onto MCM-41. The diffraction peaks in the XRD patterns of TiO-MCM-41 and Ba(II)/TiO-MCM-41 were all attributed to anatase TiO. By taking advantage of MCM-41 and Ba, the photocatalytic performance of Ba(II)/TiO-MCM-41 was remarkably enhanced by suppressing its rutile phase, by lowering the band gap energy, and by facilitating the dispersion of TiO. Therefore, the photodegradation efficiencies of p-nitrobenzoic acid (4 × 10 mol/L) by various photocatalysts (60 min) under UV light irradiation are arranged in the following order: Ba(II)/TiO-MCM-41 (91.7%) > P25 (86.3%) > TiO-MCM-41 (80.6%) > Ba(II)/TiO (55.7%) > TiO (53.9%). The Ba(II)/TiO-MCM-41 composite was reused for five cycles and maintained a high catalytic activity (73%).
采用 Ba/TiO 与 MCM - 41 的二元混合物合成了一种新型 Ba(II)/TiO - MCM - 41 复合材料，其中 Ba 作为 TiO 的掺杂离子。比表面积和孔结构表征证实，使用 Ba(II)/TiO - MCM - 41 可实现具有 341.2 m²/g 表面积且孔径分布窄（2 至 4 nm）的介孔结构。Ba(II)/TiO 颗粒被合成成 10 - 15 nm 的颗粒，并很好地分散在 MCM - 41 上。TiO - MCM - 41 和 Ba(II)/TiO - MCM - 41 的 XRD 图谱中的衍射峰均归属于锐钛矿型 TiO。通过利用 MCM - 41 和 Ba，Ba(II)/TiO - MCM - 41 的光催化性能通过抑制其金红石相、降低带隙能量以及促进 TiO 的分散而显著提高。因此，在紫外光照射下，各种光催化剂对对硝基苯甲酸（4×10⁻⁴ mol/L）的光降解效率（60 分钟）按以下顺序排列：Ba(II)/TiO - MCM - 41（91.7%）> P25（86.3%）> TiO - MCM - 41（80.6%）> Ba(II)/TiO（55.7%）> TiO（53.9%）。Ba(II)/TiO - MCM - 41 复合材料重复使用了五个循环，并保持了较高的催化活性（73%）。
