ZnO/In2O3纳米异质结的合成及其光催化性能的研究

doi:10.3724/SP.J.1077.2014.13285

无机材料学报 ›› 2014, Vol. 29 ›› Issue (3): 264-268.DOI: 10.3724/SP.J.1077.2014.13285

ZnO/In₂O₃纳米异质结的合成及其光催化性能的研究

何霞^1,2, 刘海瑞^1,2, 董海亮^1,2, 梁建^1,2, 张华^1,2, 许并社^1,2

(太原理工大学 1. 新材料界面科学与工程教育部重点实验室; 2. 材料科学与工程学院, 太原 030024)

收稿日期:2013-05-27 修回日期:2013-07-14 出版日期:2014-03-20 网络出版日期:2014-02-18
作者简介:何霞(1987-), 女, 硕士研究生. E-mail: 308991586@qq.com
基金资助:
国家自然科学基金(51002102);山西省自然科学基金(2012011046-7)

Synthesis and Photocatalytic Properties of ZnO/In₂O₃Heteronanostructures

HE Xia^1,2, LIU Hai-Rui^1,2, DONG Hai-Liang^1,2, LIANG Jian^1,2, ZHANG Hua^1,2, XU Bing-She^1,2

(Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China; 2. Shanxi Research Center of Advanced Materials Science and Technology, Taiyuan 030024, China)

Received:2013-05-27 Revised:2013-07-14 Published:2014-03-20 Online:2014-02-18
About author:HE Xia. E-mail: 308991586@qq.com
Supported by:
National Natural Science Foundation of China (51002102);Natural Science Foundation of Shanxi Province (2012011046-7)

摘要/Abstract

摘要：

通过热水解法成功制备出了形貌均一的ZnO/In₂O₃异质结光催化材料, 采用场发射扫描电子显微镜(FESEM)、X射线衍射仪(XRD)以及透射电子显微镜(TEM)对样品的形貌及结构进行表征。结果表明: ZnO/In₂O₃异质结是由直径约200~300 nm、厚度约40~60 nm的六边形纳米片镶嵌着In₂O₃纳米小颗粒组成。对比纯ZnO、纯In₂O₃和该光催化材料对罗丹明B(RhB)的可见光降解效率, 发现ZnO/In₂O₃异质结光催化材料对RhB具有较高的光催化效率, 其原因是窄带系半导体In₂O₃能够有效地吸收可见光, 当ZnO与In₂O₃形成异质结时, In₂O₃能带上被可见光激发的电子会迁移到ZnO的导带上, 而光激发的空穴仍保留在In₂O₃价带, 这样有助于光生电子和空穴的分离, 降低其复合几率, 从而有效地提高了ZnO的光催化效率。

关键词: ZnO, ZnO/In₂O₃, 罗丹明B, 光催化效率

Abstract:

Homogeneous ZnO/In₂O₃heteronanostructure photocatalytic materials were successfully synthesized by a pyrohydrolytic method. The structures and morphologies of ZnO/In₂O₃heterostructure were investigated by field emission scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). Results indicate that ZnO/In₂O₃ heterostructures consist of hexagon nanosheet ZnO with diameter of about 200-300 nm and thickness of 40-60 nm decorated with In₂O₃ nanoparticles. Compared with the degradation efficiency of RhB by pure ZnO, pure In₂O₃ and ZnO/In₂O₃, the results show that ZnO/In₂O₃heterostructure photocatalysts possess higher photocatalytic efficiency. The enhanced photocatalytic activity is mainly attributed to the role of narrow-band semiconductor In₂O₃, which could effectively absorb visible light. Photo-excited electrons of In₂O₃’senergy band remove to conduction band of ZnO, while photo-excited holes still remain in In₂O₃’s valence band, which contributes to the separation of photo-generated electrons and holes, decreases recombination probability, and thus improves the photocatalytic efficiency.

Key words: ZnO, ZnO/In₂O₃, RhB, photocatalytic efficiency

中图分类号:

O643

何霞, 刘海瑞, 董海亮, 梁建, 张华,许并社. ZnO/In₂O₃纳米异质结的合成及其光催化性能的研究[J]. 无机材料学报, 2014, 29(3): 264-268.

HE Xia, LIU Hai-Rui, DONG Hai-Liang, LIANG Jian, ZHANG Hua, XU Bing-She. Synthesis and Photocatalytic Properties of ZnO/In₂O₃Heteronanostructures[J]. Journal of Inorganic Materials, 2014, 29(3): 264-268.

图/表 5

图1 纯ZnO纳米颗粒, ZnO/In2O3异质结和纯In2O3纳米片的XRD图谱

Fig. 1 XRD patterns of pure ZnO nanoparticles, ZnO/In2O3 heterostructure and pure In2O3 nanosheets

图2 ZnO/In2O3二元异质结纳米结构不同放大比例的SEM照片(a, b)和EDS图谱(c)

Fig. 2 Different magnification SEM images of ZnO/In2O3 heterostructure (a, b) and corresponding EDS pattern (c)

图3 ZnO/In2O3异质结的TEM(a)和HRTEM照片(b)

Fig. 3 TEM image of ZnO/In2O3 heterostructure (a) and HR- TEM image of the interface between ZnO and In2O3 (b)

图4 在黑暗条件下有光催化材料和在有可见光的条件下没有光催化材料时对RhB的降解曲线(a)和不同催化材料在可见光辐射条件下得到的光催化降解曲线(b)以及表观一阶线性拟合曲线(c)

Fig. 4 Degradation proﬁles of RhB with the photocatalysts in the dark and without photocatalyst under visible light irradiation (a), degradation profiles of RhB with different photocatalysts (b) and the corresponding kinetic linear fitting curves (c)

图5 可见光照射下ZnO/In2O3异质结的光催化机理图

Fig. 5 Photocatalytic mechanism scheme of ZnO/In2O3 heterostructure under visible light irradiation

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ZnO/In₂O₃纳米异质结的合成及其光催化性能的研究

Synthesis and Photocatalytic Properties of ZnO/In₂O₃Heteronanostructures

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