单一相板钛矿TiO₂的制备及光催化性能研究

Synthesis and Photocatalytic Properties of Single Crystalline Brookite TiO₂

以四氯化钛(TiCl4)、尿素、乳酸钠为反应物,采用水热法制备了单一相板钛矿TiO2。利用X射线衍射仪、拉曼光谱仪、扫描电镜、透射电镜、比表面积分析仪等手段对所得样品进行了结构和形貌分析。以亚甲基蓝溶液为目标降解物,在紫外灯照射下测试了所得样品的光催化活性。实验结果表明,所得样品为长约60~80 nm、宽约20~30 nm的板钛矿TiO2纳米片。在紫外灯照射40 min后,所得单一相板钛矿TiO2对亚甲基蓝溶液的脱色率为94.5%,明显高于相应的商业级TiO2 (P25) (86.7%)。

Single crystalline brookite TiO2 was synthesized by hydrothermal method using titanium chloride, urea and sodium lactate as starting materials. X-ray powder diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, Brunauer Emmett and Teller surface area analysis were utilized to characterize the as-synthesized sample. Photocatalytic activity of the as-synthesized sample was evaluated by photodegradation of methylene blue under ultraviolet light irradiation. Experimental results showed that brookite TiO2 nanosheets were ob-tained with the length of 60 - 80 nm and the width of 20 - 30 nm. The as-prepared single crystalline brookite TiO2 nanosheets showed high photocatalytic activity to methylene blue and the corres-ponding degradation rate of methylene blue (10 mg/L) reached to 94.5% after UV light illumination for 40 min, much higher than that of P25 investigated under the same conditions (86.7%).