高比表面积CuPc/TiO_2纳米管复合材料的制备及其可见光光催化活性  

Synthesis of CuPc/TiO_2 Nanotube Composite Materials with Large Surface Area and Their Photocatalytic Activity under Visible Light

作　　者：廖兰[1] 黄彩霞[1,2] 陈劲松[1] 吴月婷[1,2] 韩志钟[1] 潘海波[1,2] 沈水发[1] 

机构地区：[1]福州大学化学化工学院,福建福州350108 [2]福州大学福建省医疗器械和医药技术重点实验室,福建福州350002

出　　处：《催化学报》2012年第6期1048-1054,共7页

基　　金：科技部国际合作项目(2009DFA32050);福建省自然科学基金(2008J0330);福建省科技术厅(2008F5033;2009I0016);福州大学科研项目(0460-023028)~~

摘　　要：以P25为前驱体,在碱性条件下采用水热法制备了TiO2纳米管(NT),然后通过浸渍法将敏化剂酞菁铜(CuPc)附着于TiO2NT表面,制得可见光响应的CuPc/TiO2NT复合光催化材料,并对其进行了表征,考察了它在可见光下降解罗丹明B的光催化活性.结果表明,在NaOH碱性条件下水热法制备的TiO2NT具有较大的比表面积(362.6m2/g)和高孔容(2.039cm3/g),经0.2%CuPc修饰后,复合材料仍然保持较高的比表面积(244.2m2/g)和孔容(1.024cm3/g),进而提高了CuPc与TiO2界面的光生电荷转移速率,使光生电子-空穴能够在此界面上形成有效分离,从而明显提高了复合材料的光催化活性.在可见光辐照下,0.2%CuPc/TiO2NT复合材料的光催化性能最好,反应180min时,罗丹明B的降解率可达59%,比TiO2NT的提高了3.3倍.TiO2-based nanotubes（TiO2NT） were synthesized by hydrothermal treatment under the alkaline conditions using P25 as the raw material.Then copper phthalocyanine（CuPc） was chosen as a sensitizer to prepare CuPc modified TiO2NT composite material（CuPc/TiO2NT） by the immersion method.The structure and properties of the samples were characterized,and the photocatalytic activity of pure TiO2NT and CuPc/TiO2NT was also evaluated by degradating rhodamine B under the visible light.The results showed that the TiO2NT had large surface area（362.6 m2/g） and high pore volume（2.039 cm3/g）.Even after modified by CuPc,the composite material still kept the high surface area（244.2 m2/g） and pore volume（1.024 cm3/g） for 0.2%CuPc/TiO2NT.The recombination of photo-injected electrons decreases based on the effective charge separation on the interface of TiO2NT and CuPc,improving the transfer efficiency of the photo-excited charges under visible light.Furthermore,the catalyst exhibited obvious visible photocatalytic activity after sensitized by CuPc.As the mole percentage of CuPc was 0.2% in the composite,the degradation rate of rhodamine B over 0.2%CuPc/TiO2NT could reach 59%,increasing by 3.3 times compared with pure TiO2NT after reaction for 180 min.

关 键 词：二氧化钛 纳米管 酞菁铜 染料敏化 可见光 罗丹明B 

分 类 号：O643.36[理学—物理化学]