高比表面积CuPc/TiO2纳米管复合材料的制备及其可见光光催化活性

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...

Synthesis of CuPc/TiO2 Nanotube Composite Materials with Large Surface Area and Their Photocatalytic Activity under Visible Light

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.