Wu Wan, Zhu Jie, Deng Yue Hong, Xiang Ye, Tan Ya Wen, Tang Hai Qin, Zou Hao, Xu Yi Feng, Zhou Yi
Department of Chemistry and Food Engineering, Changsha University of Science and Technology Changsha 410114 China
RSC Adv. 2019 Oct 7;9(54):31728-31734. doi: 10.1039/c9ra06359e. eCollection 2019 Oct 1.
The exposure of a specific crystal face to a specific composition or a suitable carrier composition with synergistic effects can effectively improve the photocatalytic activity of the material and enhance its practical value. For choosing an ideal carrier, the primary factor is a large specific surface area. Herein, by using MIL-100(Fe) as the carrier, an egg-like TiO/MIL-100(Fe) composite was successfully prepared, for the first time, a facile two-pot hydrothermal method. XRD, SEM, TEM and other characterization methods showed that when the molar ratio of Ti : Fe was 0.3 : 1, the morphology of the TiO/MIL-100(Fe) composite was completely egg-like. The TEM results showed that the {001} and {101} facets of TiO in the TiO/MIL-100(Fe) composite were co-exposed. The BET results showed that the TiO/MIL-100(Fe) composite had a large specific surface area and pore size. The larger pore size provided an effective channel for the photocatalytic degradation of MB and the interfacial effect of TiO and MIL-100(Fe). The separation efficiency of the photogenerated electron-hole pairs was effectively improved. The efficiency of 30% TiO/MIL-100(Fe) in the photocatalytic degradation of MB reached 99.02% in 30 min under visible light. All these findings showed that the composite of the effectively charge-separated photocatalytic semiconductor and the porous MOF with a high specific surface area had a high potential application value for the photocatalytic degradation of organic pollutants.
特定晶面与具有协同效应的特定组成或合适载体组成接触，可有效提高材料的光催化活性并增强其实际价值。选择理想载体时，首要因素是大比表面积。在此，以MIL-100(Fe)为载体，首次通过简便的两步水热法成功制备了蛋状TiO/MIL-100(Fe)复合材料。XRD、SEM、TEM等表征方法表明，当Ti : Fe的摩尔比为0.3 : 1时，TiO/MIL-100(Fe)复合材料的形貌完全呈蛋状。TEM结果表明，TiO/MIL-100(Fe)复合材料中TiO的{001}和{101}面共同暴露。BET结果表明，TiO/MIL-100(Fe)复合材料具有大比表面积和孔径。较大的孔径为MB的光催化降解以及TiO与MIL-100(Fe)的界面效应提供了有效通道。光生电子-空穴对的分离效率得到有效提高。30%的TiO/MIL-100(Fe)在可见光下30分钟内对MB的光催化降解效率达到99.02%。所有这些发现表明，有效电荷分离的光催化半导体与具有高比表面积的多孔MOF的复合材料在有机污染物的光催化降解方面具有很高的潜在应用价值。
