GaN/ZnO复合体的制备及光催化性能

doi:10.15541/jim20130617

无机材料学报 ›› 2014, Vol. 29 ›› Issue (9): 956-960.DOI: 10.15541/jim20130617 CSTR: 32189.14.10.15541/jim20130617

GaN/ZnO复合体的制备及光催化性能

彭丹¹, 郑学军¹, 谢澍梵², 罗晓菊², 王丁²

(1. 湘潭大学材料与光电物理学院, 湘潭 411105; 2. 上海理工大学材料科学与工程院, 上海 200093)

收稿日期:2013-11-26 修回日期:2014-03-09 出版日期:2014-09-17 网络出版日期:2014-08-21
作者简介:彭丹(1989–), 男, 硕士研究生. E-mail: 815805413@qq.com
基金资助:
教育部长江学者和创新团队发展计划(IRT1080);国家自然科学基金 (51272158);长江学者奖励计划([2009]17);上海市纳米专项基金(11nm0502600)

Fabrication and Photocatalytic Performance of GaN/ZnO Composites

PENG Dan¹, ZHENG Xue-Jun¹, XIE Shu-Fan², LUO Xiao-Ju², WANG Ding²

(1. School of Materials and Optoelectronic Physics, Xiangtan University, Xiangtan 411105, China; 2. School of Materials Science and Engineering, University of Shanghai for Science & Technology, Shanghai 200093, China)

Received:2013-11-26 Revised:2014-03-09 Published:2014-09-17 Online:2014-08-21
About author:PENG Dan. E-mail: 815805413@qq.com
Supported by:
Program for Changjiang Scholars and Innovative Research Team (IRT1080);National Natural Science Foundation of China (51272158);Changjiang Scholar Incentive Program ([2009]17);Shanghai Nano Special Foundation (11nm0502600)

摘要/Abstract

摘要：

首先用聚乙烯吡咯烷酮(PVP)作为表面活性剂, 硝酸镓[Ga(NO₃)₃]作为镓源, 采用溶胶-凝胶法制备了GaN粉末。然后通过固相法将GaN粉末和ZnO粉末按不同配比机械混合, 制备成GaN/ZnO复合体。采用X射线粉末衍射(XRD)、扫描电镜(SEM)、X射线能谱 (EDS)、高分辨透射电子显微镜(HRTEM)和发致光谱(PL)表征GaN/ZnO复合体的微结构、形貌、成分和发光特性, 并将其作为催化剂进行降解亚甲基蓝水溶液的光催化性能测试。结果表明: GaN/ZnO复合体对比未经复合的GaN和ZnO粉末, 光催化性能有明显的增强。基于一级动力学方程分析, 当GaN/ZnO复合体中GaN粉末和ZnO粉末含量配比为1: 2时, 光催化性能达到最佳, 其速率常数k值为0.11 min^-1。

关键词: GaN/ZnO复合体, 光催化, 亚甲基蓝, 反应动力学

Abstract:

GaN powder was firstly synthesized by the Sol-Gel method using polyvinylpyrrolidone (PVP) and gallium nitrate [Ga(NO₃)₃] as surfactant and gallium source, respectively. Then, GaN/ZnO composites were prepared by solid phase method through mechanical mixing GaN powder and ZnO powder with different proportions. The composites were characterized by using X-Ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), high-resolution X-ray electron microscope (HRTEM) and photoluminescence (PL) spectra. The photocatalytic performance of GaN/ZnO composites as catalyst was tested by degradation of methylene blue in aqueous solution under white light irradiation. The results show that the photocatalytic property of GaN/ZnO composites is obviously improved comparing with that of pure GaN and ZnO powders. The photocatalytic activity is analyzed by pseudo-first-order kinetics equation, showing that the best photodegradation rate constant k is 0.11 min^-1 for the GaN/ZnO composites with GaN and ZnO mixing ratio of 1: 2.

Key words: GaN/ZnO composites, photocatalysis, methylene blue, reaction kinetics

中图分类号:

O643

彭丹, 郑学军, 谢澍梵, 罗晓菊, 王丁. GaN/ZnO复合体的制备及光催化性能[J]. 无机材料学报, 2014, 29(9): 956-960.

PENG Dan, ZHENG Xue-Jun, XIE Shu-Fan, LUO Xiao-Ju, WANG Ding. Fabrication and Photocatalytic Performance of GaN/ZnO Composites[J]. Journal of Inorganic Materials, 2014, 29(9): 956-960.

图/表 6

图1 GaN/ZnO复合体的XRD图谱

Fig. 1 XRD patterns of GaN/ZnO composites

图2 GaN/ZnO复合体的SEM照片以及配比为1: 1的GaN/ZnO复合体的EDS能谱图

Fig. 2 SEM images of GaN/ZnO composites with different ratios and EDS images of GaN/ZnO composites with ratio of 1: 1 (a) GaN; (b) GaN: ZnO=4: 1; (c) GaN: ZnO=1: 1; (d) GaN: ZnO=1: 2; (e) GaN: ZnO=1: 4; (f) ZnO; (g) EDS of hollow cross fork; (h) EDS of solid cross fork

图3 GaN/ZnO复合体的TEM(a)和HRTEM(b)图片

Fig. 3 TEM (a) and HRTEM (b) images of GaN/ZnO composites

图4 GaN/ZnO复合体的PL光谱图

Fig. 4 PL spectra of GaN/ZnO compositesInset is the PL spectra of GaN powder

图5 GaN/ZnO复合体对应的亚甲基蓝水溶液在不同时间间隔的吸收光谱

Fig. 5 Absorption spectra of the methylene blue solution at different time intervals with GaN/ZnO composites (a) GaN; (b) GaN: ZnO=4: 1; (c) GaN: ZnO=1: 1; (d) GaN: ZnO=1: 2; (e) GaN: ZnO=1: 4; (f) ZnO

图6 GaN/ZnO复合体降解亚甲基蓝的降解率随降解时间变化曲线和ln(C0/C)与降解时间关系曲线

Fig. 6 Methylene blue solution degradation efficiency with irradiation time (a) and relationship between ln(C0/C) and irradiation time (b) with GaN/ZnO composites

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GaN/ZnO复合体的制备及光催化性能

Fabrication and Photocatalytic Performance of GaN/ZnO Composites

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