中文摘要：

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。

英文摘要：

The calcium titanium oxide compounds with different photocatalytic characteristics were prepared by solvothermal method using TBOT and Ca Cl2 as starting materials. The phase structure, micro-morphology, optical absorption properties and band gap width of as-prepared powders were characterized by X-Ray diffraction（XRD）, field emission scanning electron microscope（FESEM） and UV-Vis absorption spectra（UV-Vis）. The influence of different ratios of solvents on phase structure, micro-structure, band gap width and photocatalytic properties of calcium titanium oxide compounds were studied. The results showed that the CaTi_2O_4（OH）_2 with a sheet structure had a pure phase can be obtained when the ratio of water to ethanol was 50 ∶ 10. While the ratio of water to ethanol was 50 ∶ 40, a coexisting body with a large amount of nanofiber and a small amount of massive CaTiO_3 morphologies can be obtained. When the ratio of water to ethanol was 150 ∶ 10, the powder was flaky CaTi_2O_4（OH）_2 and a small amount of massive CaTiO_3 composition. The effect of solvent with different ratios on the photocatalytic properties of the powder was analyzed, when the ratio of water to ethanol was 50 ∶ 40, the prepared powder has the smallest bandgap width, and the photocatalytic efficiency for the rhodamine B was the best under UV-light of 6 h.