具有高光催化活性的板钛矿型氧化钛的低温制备

Preparation of brookite TiO_2 materials with high photocatalytic activity at low temperature

以Ti(OBu)_4为钛源,三乙醇胺为溶剂,采用水热合成法制备了单一板钛矿型TiO_2催化剂,通过XRD、UV-vis和SEM对板钛矿型TiO_2的晶型、晶化度、粒子大小及光吸收性质进行了表征。结果表明,140℃水热条件下,合成的板钛矿相TiO_2样品不仅具有很高的晶相纯度,而且具有较高晶化程度,板钛矿型TiO_2呈椭圆状,大小约为50nm×20nm。以亚甲基蓝为模型污染物考察了板钛矿型TiO_2样品的光催化活性,发现板钛矿型TiO_2具有较高的光催化活性,并且经过5次光催化反应循环,仍然能保持其光催化活性。

TiO2 with brookite crystalline phase was prepared by hydrothermal method using Ti（OBu）4as starting materials and trolamine as solvent.X-ray diffraction（XRD）,Raman spectroscopy,UV-visible diffuse reflectance spectra,and SEM were used to characterize the crystalline phase,crystallinity,particle size,and the optical properties of brookite TiO2 sample.It was found that brookite TiO2 exhibits pure crystalline phase,and high crystallinity under our experiment conditions.The result from SEM showed that the prepared brookite powder has an ellipsoidal morphology with 50nm×20nm.Brookite TiO2 was utilized as the photocatalysts for the degradation of Methylene Blue（MB）.It was found that brookite TiO2 shows high photocatalytic activity for MB degradation.Moreover,brookite TiO2 exhibits the stable photocatalytic activity after 5th reaction run.