以硫酸钛和氟硅酸水热法制备花状多级TiO_2微球（英文）

Hydrothermal Synthesis of Flower-like Hierarchical TiO_2 Microspheres from Titanium Sulfate and Hexafluorosilicic Acid

以廉价的硫酸钛为原料和氟硅酸为结构控制剂,用成本低效益好的水热法制备暴露{001}面纳米片组装的花状多级TiO2微球。这些多级微球是由许多交联的纳米片组装。通过调变氟硅酸根离子的浓度可以容易地控制多级微球的精细结构。通过XRD和SEM表征来检测微球的生长过程,并提出了可能的形成机理。与其他溶解热合成法相比,这种成本低效益好的水热合成法有望应用于大批量生产花状多级TiO2微球。这种精制的花状多级TiO2微球展现了很好的光催化降解甲基橙的能力。

Flower-like hierarchical TiO2 microspheres assembled by nanosheets with exposed {001 } facets were prepared through a cost-effective hydrothermal synthesis method, using cheap Ti（SO4）2 as the feedstock and hexafluoro- silicic acid as the capping agent. These hierarchical microspheres were assembled by numerous and cross-linked nanosheets. The fine structure of hierarchical microspheres could be easily controlled by adjusting the concentration of hexafluorosilicic ions. The growth process of the microspheres was examined through XRD and SEM characteriza- tions, and a possible formation mechanism was proposed. Compared with other solvothermal synthesis methods, this cost-effective hydrothermal synthesis route is attractive and can be potentially applied in the production of fower-like TiO2 hierarchical microspheres in large scale. The as-prepared flower-like TiO2 hierarchical microspheres exhibit good photocatalytic ability to degrade methyl orange dye.