Abstract: Hydrothermal synthesis of anatase titania nano-powder is a widely used method in the chemical industry and the material sciences. The size of the anomaterial is one of the significant concerns in related researches. Anatase titania with different sizes are synthesized from Ti(SO₄)₂ by adjusting the pH value, the reaction time and the precursors concentrations. The results indicate that the size of nano-titania has an approximately logarithmic relation with the reaction time; the influence of Ti(SO₄)₂ concentration and pH value on the particle size is independent; the synthesis of anatase titania nano-powder with different sizes could be achieved by controlling the synthesis temperature, the precursor concentrations and the pH values.

Key words: nano-titania, hydrothermal method, condition synthesis

摘要： 以Ti(SO₄)₂为前驱体, HSO或NaOH为pH调节剂, 通过水热法合成了不同晶粒尺寸的锐钛矿相纳米TiO₂, 并研究了反应体系的pH值、反应时间和Ti(SO₄)₂浓度对TiO₂晶粒尺寸的影响。结果表明, 纳米TiO₂的晶粒尺寸与反应时间近似成对数关系, Ti(SO₄)₂浓度与反应体系的 pH 值对纳米TiO₂晶粒尺寸的影响有近似线性叠加关系。通过对pH值、反应温度和Ti(SO₄)₂浓度的调节, 可实现纳米TiO₂ 的可控合成。

关键词: 二氧化钛, 水热法, 可控合成