{001}面TiO_2光催化降解罗丹明B的研究

PHOTOCATALYTIC DEGRADATION OF RHODAMINE B ON ANATASE TiO_2 WITH {001} FACETS

以钛酸四丁酯为钛源、HF为形貌控制剂,采用水热法在不同反应温度条件下制备纳米片状{001}面TiO2,并以罗丹明B的光催化降解为模型反应,考察了不同反应温度对{001}面TiO2形貌结构的影响,研究了反应温度、pH及催化剂投加量对光催化活性的影响。结果表明,所有{001}面TiO2均具有良好的锐钛矿相衍射峰,并且在紫外光区域具有明显的光吸收;当反应温度为180℃、溶液pH为2、投加量为1 g/L时,样品对罗丹明B光催化降解活性最高,紫外光照射20 min后罗丹明B降解率可达100%。

A series of anatase TiOz nanosheets with exposed {001 } facets were synthesized by a hydrothermal method using tetrabutyl titanate as a titanium source and HF solution as the solvent. The photocatalytic activities of the samples were evaluated by rhodamine B degradation. The influences of different reaction temperature, pH and catalyst dosage on the photocatalytic activity were investigated. TiO2 with exposed {001 } facets had good anatase crystal structure and showed strong adsorption for UV light. When the reaction temperature was 180 ℃, the pH of solution was 2, and the catalyst dosage was 1 g/L, the sample showed the highest photocatalytic activity for the degradation ofrhodarnine B, which could reach 100% under UV irradiation for 20 min.