The paper presents the results of characterization and study of adsorption-photocatalytic properties of commercial and synthesized-by-hydrothermal method TiO₂ and TiO₂-SnO₂ nanocomposites. Hydrothermal synthesis of TiO₂-based nanocomposites was performed in two ways: single-stage and two-stage methods. Characterization was carried out by XRD, X-ray fluorescence method, XPS, EPR, PL, and low-temperature adsorption-desorption of nitrogen, which showed that TiO₂-SnO₂ nanostructured composites were obtained with tin(IV) oxide content of 10 wt.% and had acidic surface and different porous structures. Besides, modification of a commercial sample with tin(IV) oxide led to a slight decrease in the specific surface area, while modification of a synthesized-by-hydrothermal method TiO₂ sample led to an increase. It was found that sorption properties of the obtained nanocomposites and pure TiO₂ are better towards anionic dyes. Photocatalytic activity, on the contrary, is higher towards cationic dyes, which is consistent with additional studies on the destruction of these dyes. It was established that in terms of photocatalytic activity, TiO₂-SnO₂ nanocomposites are more promising than solid solutions, and modification of TiO₂ with tin(IV) oxide, in general, leads to improvement of its photocatalytic activity.

中文翻译：

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TiO2 / SnO2二元纳米复合材料的光催化活性增强

本文介绍了表征的结果，并研究了商用和水热法合成的TiO ₂和TiO ₂ -SnO ₂纳米复合材料的吸附-光催化性能。TiO ₂基纳米复合材料的水热合成以两种方式进行：单阶段和两阶段方法。通过XRD，X射线荧光法，XPS，EPR，PL和氮的低温吸附-脱附进行了表征，结果表明TiO ₂ -SnO ₂得到的纳米结构复合材料的氧化锡（IV）含量为10 wt。％，具有酸性表面和不同的多孔结构。此外，用氧化锡（IV）修饰商业样品导致比表面积略有减小，而通过水热法合成的TiO ₂样品修饰导致增加。发现所获得的纳米复合材料和纯TiO ₂对阴离子染料的吸附性能更好。相反，对阳离子染料的光催化活性较高，这与有关销毁这些染料的其他研究一致。已经确定，就光催化活性而言，TiO ₂ -SnO ₂纳米复合材料比固溶体更有前景，通常用氧化锡（IV）修饰TiO ₂可以提高其光催化活性。