Bi4Ti3O12/TiO2异质结的制备及其光催化性能*

doi:10.11901/1005.3093.2013.942

材料研究学报

2014, Vol. 28

Issue (7): 503-508 DOI: 10.11901/1005.3093.2013.942

本期目录 | 过刊浏览

Bi₄Ti₃O₁₂/TiO₂异质结的制备及其光催化性能^*

陈侃松^1,²(

),黎旸^1,²,田寒^1,²,顾豪爽^1,²

1. 湖北大学计算机与信息工程学院武汉 430062
2. 有机化工新材料湖北省协同创新中心武汉 430062

Synthesis and Photocatalytic Performance of Heterostructured Nano-Composite Bi₄Ti₃O₁₂/TiO₂

Kansong CHEN^1,^2,^**(

),Yang LI^1,²,Han TIAN^1,²,Haoshuang GU^1,²

1. School of Computer Science and Information Engineering, Hubei University, Wu Han 430062
2. Hubei Collaborative Innovation Center for Advanced Organic Chemical Material, Wu Han 430062

引用本文:

陈侃松,黎旸,田寒,顾豪爽. Bi₄Ti₃O₁₂/TiO₂异质结的制备及其光催化性能^*[J]. 材料研究学报, 2014, 28(7): 503-508.
Kansong CHEN, Yang LI, Han TIAN, Haoshuang GU. Synthesis and Photocatalytic Performance of Heterostructured Nano-Composite Bi₄Ti₃O₁₂/TiO₂[J]. Chinese Journal of Materials Research, 2014, 28(7): 503-508.

全文: PDF(3552 KB) HTML

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。

关键词 ：无机非金属材料, 异质结, Bi₄Ti₃O₁₂, 静电纺丝, TiO₂, 光催化

Abstract：

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 TiO₂ decorated 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/TiO₂ exhibited 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/TiO₂ in the synthesized product.

Key words： inorganic non-metallic materials heterostructure Bi₄Ti₃O₁₂ electrospinning technique TiO₂ photocatalytic

收稿日期: 2013-12-12

基金资助:* 国家自然科学基金11274103和湖北省教育厅重点项目D20111003资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.942 或 https://www.cjmr.org/CN/Y2014/V28/I7/503

图1 水热前后TiO2纳米棒和BTO-EF3样品的XRD图谱

图2 水热前后纳米棒、BTO-EF1、BTO-EF2以及BTO-EF3样品的SEM图谱

图3 样品BTO-EF3的TEM图谱、HRTEM图谱以及EDS图谱

图4 不同样品的紫外可见漫反射吸收图谱和(αhn)1/2 与光子能量的变换关系

图5

图6 Bi4Ti3O12/TiO2异质结的光催化反应机理图

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