TiO2/g-C3N4光催化材料的制备及其可见光降解性能研究

Preparation and photocatalytic degradation property of TiO/g-CN material

将纳米TiO2与尿素均匀混合,以密封热解的方法制备了二氧化钛/石墨相氮化碳(TiO2/g-C3N4)复合光催化剂。利用X射线衍射仪、傅里叶变换红外光谱仪、扫描电子显微镜对复合光催化剂进行了表征,研究了TiO2/g-C3N4复合光催化剂的可见光降解性能、对染料的降解选择性和循环降解寿命。结果表明,TiO2与g-C3N4成功地结合在一起,制备的TiO2/g-C3N4复合光催化剂降解性能优于纯g-C3N4,降解过程中TiO2/g-C3N4反应速率常数是纯g-C3N4的2.22倍,对罗丹明B(RhB)的降解效果最好,循环5次后RhB降解率降低了14.3%。

TiO2/g-C3N4composite photocatalytic material was prepared by uniformly mixing nano TiO2 with urea and then sealed pyrolysis.The material was characterized by X-ray diffractometry,fourier transform infrared spectroscopy and scanning electron microscope.The visible light degradation property of TiO2/g-C3N4,degradation selectivity and cycle degradation life were investigated.The results shown that the composite material was succeeded to couple TiO2and g-C3N4.The fabricated TiO2/g-C3N4had better degradation property than pure g-C3N4,with the 2.22times reaction rate constant than pure g-C3N4.Rhodamine(RhB)was degraded best by TiO2/g-C3N4.After 5cycles,the degradation efficiency reduced by 14.3%.The prepared TiO2/g-C3N4composite photocatalytic material had a broad application prospect in industrial wastewater treatment.