摘要
用静电纺丝和水热法制备了Bi4Ti3O12/TiO2异质结,用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)对Bi4Ti3O12/TiO2异质结和TiO2纳米棒的形貌及晶体结构进行了表征和分析。其紫外可见漫反射光谱(UV-vis DRS)表明,相比于纯TiO2纳米棒,Bi4Ti3O12/TiO2异质结的吸收带边有明显的红移,禁带宽度也有减小,说明Bi4Ti3O12/TiO2异质结的形成有利于提高样品对可见光的吸收。从光致发光图谱(PL)可见,Bi4Ti3O12/TiO2异质结在440 nm的发射峰强度明显减弱,说明Bi4Ti3O12/TiO2之间的异质结结构有效抑制了光生电子和空穴的复合。对甲基橙的紫外光催化降解结果表明,这种异质结在紫外光辐射下表现出更高的光催化活性,随着异质结浓度的增加其光催化性能明显提高。
Heterostructured nano-composite Bi4Ti3O12/TiO2was synthesized by a two step process, i.e. the nano-rods TiO2were prepared by electrospinning technique and then the nano Bi4Ti3O12was grew on the nano-rods TiO2by a hydrothermal process. Scanning and transmission electron microscopy observation proves that the as- synthesized nano- composite is consisted of nano- rods TiO2decorated with nanostructured Bi4Ti3O12. In comparison with the nano-rods TiO2, a slight red-shift on the UV-Vis absorption spectra and a decrease of the emission peak intensity on the photoluminescence spectra could be observed for the as-synthesized nano-composite. The heterostructured nano-composite Bi4Ti3O12/TiO2exhibited stronger photocatalytic activity in the decomposition of MO under visible light rather than the blank nano-rods TiO2. The photocatalytic performance would be further enhanced with the increase of the content of the heterostructured nano-composite Bi4Ti3O12/TiO2in the synthesized product.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2014年第7期503-508,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金11274103
湖北省教育厅重点项目D20111003资助项目~~
