Samples of mesoporous TiO2 nanostructures with crystallite sizes of 8-10 nm, forming spheroidal particles of 60-170 nm with average mesopore diameter of 5.5-3.4 nm and specific surface area of 140-200 cm3/g, were obtained by the solvothermal sol–gel method with sulfuric acid mediums and subsequent calcination. With increase of the H2SO4 concentration the content of anatase in the reaction mixture and the size of its crystallites decrease, and the micro-mesoporous materials are transformed into mesoporous and nonporous. It was shown that the photocatalytic activity of these TiO2 materials during exposure to UV light depends largely on the anatase content and the specific surface area, whereas during exposure to visible light it also depends on the presence of acetate groups and titanyl sulfate.

中文翻译：

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TiO2 的结构和尺寸特征及其在四环素氧化中的光催化活性的影响

通过溶剂热溶胶获得了具有 8-10 nm 晶粒尺寸的介孔 TiO2 纳米结构样品，形成了 60-170 nm 的球状颗粒，平均中孔直径为 5.5-3.4 nm，比表面积为 140-200 cm3/g。用硫酸介质凝胶法和随后的煅烧。随着H2SO4浓度的增加，反应混合物中锐钛矿的含量及其微晶尺寸减小，微介孔材料转变为介孔和无孔材料。结果表明，这些 TiO2 材料在暴露于紫外光期间的光催化活性很大程度上取决于锐钛矿含量和比表面积，而在暴露于可见光期间，它还取决于乙酸酯基团和硫酸氧钛的存在。