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以钛酸正丁酯和无水氯化钙为原料,采用溶剂热法制备不同光催化特性的钙钛氧化物粉体。利用X射线衍射仪(XRD)和场发射扫描电子显微镜(FESEM)对粉体的相结构和微观形貌进行分析,并结合粉体的紫外-可见吸收分光光谱表征了材料的吸收特性及带隙宽度。研究了不同配比溶剂对钙钛氧化物相结构、微观形貌、带隙宽度和光催化特性的影响。结果表明:当水∶乙醇=50∶10时,可获得具有片状结构的CaTi_2O_4(OH)_2相;当水∶乙醇=50∶40时,可获得具有大量纳米纤维聚积和少量块状CaTiO_3形貌的共存体;当水∶乙醇=150∶10时,粉体为片状结构的CaTi_2O_4(OH)_2和少量块状CaTiO_3组成体。解析了不同配比的溶剂对粉体的光催化特性的影响机制,当水∶乙醇=50∶40时,制备的粉体具有最小的带隙宽度,在紫外可见光6h下对罗丹明B的光催化效率最佳。
The titanate titanate and anhydrous calcium chloride were used as raw materials to prepare calcia-titanium oxide powders with different photocatalytic properties by solvothermal method. The phase structure and morphology of the powders were analyzed by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The absorption characteristics and band gap of the powders were characterized by UV-Vis absorption spectra. width. The effects of different solvents on the phase structure, morphology, band gap and photocatalytic properties of CaO were studied. The results show that CaTi_2O_4 (OH) 2 phase with sheet-like structure can be obtained when water: ethanol = 50:10; when the water: ethanol = 50:40, a large amount of nano-fiber aggregates and a small amount of massive CaTiO_3 When the water: ethanol = 150: 10, the powder is CaTi2O4 (OH) 2 with a lamellar structure and a small amount of bulk CaTiO3. The effects of different solvents on the photocatalytic properties of the powders were analyzed. When water: ethanol = 50:40, the prepared powders had the smallest band gap width. Under UV-visible light for 6h, the light of rhodamine B The best catalytic efficiency.