Microwave-Assisted Synthesis of a Series of Ag/ZnO Nanocomposites and Evaluation of Their Photocatalytic Activities under Multi-Mode Photodegradation
Li Li A C D , Xiandan Huang B , Yu Gao B , Wenzhi Zhang B , Xiuli Zhang B and Xi Chen B
+ Author Affiliations
- Author Affiliations
A College of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, China.
B Faculty of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China.
C Key Laboratory of Composite Modified Material of Colleges in Heilongjang Provence, Qiqihar 161006, China.
D Corresponding author. Email: qqhrll@163.com
Australian Journal of Chemistry 68(5) 774-782 https://doi.org/10.1071/CH14293
Submitted: 13 May 2014 Accepted: 2 August 2014 Published: 3 November 2014
Abstract
A series of Ag/ZnO nanocomposites were prepared under microwave irradiation of different powers (100, 200, and 300 W). The crystal structure, morphology, and surface physicochemical properties of the as-synthesized samples were characterized by X-ray diffraction, UV–visible diffuse reflectance spectroscopy, scanning electron microscopy, and nitrogen adsorption–desorption analyses. Compared with the Ag/ZnO prepared by conventional sedimentation process, the crystal structures of Ag and ZnO did not exhibit any transformation after microwave irradiation; however, slight increases or decreases were observed in their absorption spectra and the specific surface areas. Moreover, the morphologies of all Ag/ZnO samples were changed dramatically by microwave irradiation, showing morphologies such as octagonal nano-pyramidal and multi-angled nano-pyramidal. The multi-mode photocatalytic degradation studies showed that the photocatalytic activities of the Ag/ZnO nanocomposites prepared under microwave irradiation of different powers were enhanced to different extents and were much higher than that of P25, ZnO, and Ag/ZnO prepared in the absence of microwave irradiation.
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