摘要
在用阳极氧化法制备有序排列TiO2纳米管阵列薄膜的基础上,引入脉冲沉积工艺,成功实现了均匀、弥散分布的Cu2O纳米颗粒修饰改性TiO2纳米管阵列,形成Cu2O/TiO2纳米管异质结复合材料.利用场发射扫描电镜(FESEM)、场发射透射电镜(FETEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis DRS)对样品进行表征,重点研究了Cu2O/TiO2纳米管异质结的光电化学特性和对甲基橙(MO)的可见光催化降解性能.结果表明,Cu2O纳米颗粒均匀附着在TiO2纳米管阵列的管口和中部位置,所制备的Cu2O/TiO2纳米管异质结具有高效的可见光光催化性能;在浓度为0.01 mol?L-1的CuSO4溶液中制得的Cu2O/TiO2纳米管异质结表现出最好的电化学特性和光催化性能;另外,对Cu2O纳米颗粒影响光催化活性的机理进行了讨论.
Highly ordered TiO2 nanotube arrays （TNAs） were fabricated by an electrochemical anodization process and Cu2O nanoparticles were subsequently deposited onto these TNAs via pulse deposition to form Cu2O/TiO2 nanotube heterojunction composite materials. Samples were characterized by field emission scanning electron microscopy （FESEM）, field emission transmission electron microscopy （FETEM）, X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, and UV-Vis diffusion reflection spectroscopy （DRS）. The photocatalytic performances of the Cu2O/TiO2 composites were investigated by following the visiblelight induced photocatalytic decomposition of methyl orange （MO）. The results indicated that the inner surfaces and interfaces of the TNAs had been successfully modified with uniformly distributed Cu2O nanoparticles, and that the secomposites could effectively improve the visible light photocatalytic performance. The Cu2O/TiO2 nanotube composite obtained using 0.01 mol· L-1 CuSO4 solution exhibited the best photocurrent and photocatalytic performance. Based on the results obtained, a possible photocatalytic mechanism is also discussed.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2014年第8期1535-1542,共8页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(51302060
51128201
51272062
51311130317)
高等学校博士学科点专项科研基金(20130111120019)
安徽省自然科学基金(1308085QE74)
中央高校基本科研业务费专项资金(2012HGBZ0648)资助项目~~
