ZnO/ZnSe复合纳米结构的制备及可见光光催化性能

doi:10.7503/cjcu20130983

高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (3): 455.doi: 10.7503/cjcu20130983

• 研究论文: 无机化学 • 上一篇下一篇

ZnO/ZnSe复合纳米结构的制备及可见光光催化性能

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

1. 太原理工大学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:2013-10-10 出版日期:2014-03-10 发布日期:2019-08-01
作者简介:联系人简介: 梁建, 男, 博士, 副教授, 主要从事新材料及界面科学与工程方面的研究. E-mail: liangj1220@126.com
基金资助:
国家自然科学基金(批准号: 51002102)和山西省自然科学基金(批准号: 2012011046-7)资助

Preparation of ZnO/ZnSe Nanostructures and Their Photocatalytic Properties Under Visible Light Irradiation^†

LIANG Jian^1,^2,^*(), HE Xia^1,², DONG Hailiang^1,², LIU Hairui^1,², ZHANG Hua^1,², XU Bingshe^1,²

1. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education
2. College of Materials Seience and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received:2013-10-10 Online:2014-03-10 Published:2019-08-01
Contact: LIANG Jian E-mail:liangj1220@126.com
Supported by:
† Supported by the National Natural Science Foundation of China(No.51002102) and the Natural Science Foundation of Shanxi Province, China(No.2012011046-7)

摘要/Abstract

摘要：

通过热水解法, 以氧化锌为模板, 成功制备出形貌均一的ZnO/ZnSe复合纳米结构. 为了对比不同O/Se比对光催化性能的影响, 保持其它反应参数不变, 调节还原剂水合肼的用量, 得到不同硒化程度的ZnO/ZnSe复合纳米结构. 采用场发射扫描电子显微镜、 X射线衍射仪和透射电子显微镜对样品的形貌及结构进行了表征, 通过测试该复合结构对亚甲基蓝的可见光催化降解评估了其光催化效率. 结果表明, 与纯ZnO比, ZnO/ZnSe复合结构在可见光区域和紫外光区域的光吸收范围变宽, 显示出较高的光催化效率. 原因在于ZnSe导带上的电子在扩散势能的作用下迁移到ZnO的导带上, 而空穴仍保留在ZnSe价带, 这样有助于光生电子和空穴对的分离, 降低其复合机率, 从而提高ZnO的光催化效率.

关键词: ZnO, ZnO/ZnSe, 亚甲基蓝, 光催化效率

Abstract:

Homogeneous ZnO/ZnSe nanostructure photocatalytic materials with diameters of 500 nm were successfully prepared by a pyrohydrolytic method in which ZnO nanospheres with diameters of 600 nm were used as sacrificial templates. In order to compare the effect of different O/Se ratios on photocatalytic properties, ZnO/ZnSe nanostructures with different degrees of selenylation were obtained by keeping other reaction parameters unchanged and adjusting the amount of hydrazine hydrate. The structures and morphologies of pure ZnO and ZnO/ZnSe nanostructures were investigated by field emission scanning electron microscopy(SEM) and X-ray diffraction(XRD). And their photocatalytic activities were investigated by degradation of methylene blue(MB) solution. The results indicate that ZnO/ZnSe nanostructures show wider absorption bands in the visible region as well as in the UV region and exhibit superior photocatalytic performance compared with pure ZnO. This is mainly attributed to narrow-band ZnSe, which could effectively absorb visible light and make electrons excited. Photoexcited electrons could be transferred to the conduction band of ZnO under the power of diffusion potential, while the holes remain in the ZnSe valence band, which facilitates charge separation of electron-hole pair, decreases recombination probability, and thus improves the photocatalytic efficiency.

Key words: ZnO, ZnO/ZnSe, Methylene blue(MB), Photocatalytic efficiency

中图分类号:

O614.24
O643

TrendMD:

梁建, 何霞, 董海亮, 刘海瑞, 张华, 许并社. ZnO/ZnSe复合纳米结构的制备及可见光光催化性能. 高等学校化学学报, 2014, 35(3): 455.

LIANG Jian, HE Xia, DONG Hailiang, LIU Hairui, ZHANG Hua, XU Bingshe. Preparation of ZnO/ZnSe Nanostructures and Their Photocatalytic Properties Under Visible Light Irradiation^†. Chem. J. Chinese Universities, 2014, 35(3): 455.

图/表 9

Fig.1 SEM image(A) and XRD pattern(B) of pure ZnO nanospheres

Fig.2 SEM images of ZnO/ZnSe heterostructure synthesized with different amounts of hydrazine hydrate (A), (B) 10 mL; (C), (D) 15 mL; (E), (F) 20 mL.

Table 1 Elemental distribution of samples S1, S2 and S3

Sample	Mass fraction(%)
Sample	Zn	O	Se
S1	84.5	13.6	2.0
S2	83.9	12.2	3.9
S3	74.2	16.9	8.8

Fig.3 XRD patterns of samples S1(a), S2(b) and S3(c)

Fig.4 TEM image of ZnO/ZnSe heterostructure(A) and HRTEM images of the framed parts 1(B) and 2(C)

Fig.5 Degradation curves of MB under visible light irradiation with pure ZnO(a) and samples S1(b), S2(c), S3(d) as catalysts(A) and their kinetic linear fitting curves(B)

Table 2 Photocatalytic activity and O/Se mass ratio of four samples

Sample	m(O):m(Se)	Degradation rate(%)	k'/h^-1	R²
ZnO	1:0	69.73	0.00355	0.98948
S1	6.8:1	92.16	0.00709	0.98310
S2	3.2:1	99.99	0.01933	0.97596
S3	1.9:1	96.37	0.00979	0.98261

Fig.6 Diffuse reflectance UV-Vis spectra of ZnO(a), and samples S1(b), S2(c) and S3(d)

Fig.7 Energy band structures of ZnO/ZnSe heterostructure under visible light irradiation

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ZnO/ZnSe复合纳米结构的制备及可见光光催化性能

Preparation of ZnO/ZnSe Nanostructures and Their Photocatalytic Properties Under Visible Light Irradiation^†

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ZnO/ZnSe复合纳米结构的制备及可见光光催化性能

Preparation of ZnO/ZnSe Nanostructures and Their Photocatalytic Properties Under Visible Light Irradiation†

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Preparation of ZnO/ZnSe Nanostructures and Their Photocatalytic Properties Under Visible Light Irradiation^†