期刊
APPLIED SURFACE SCIENCE
卷 435, 期 -, 页码 108-116出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.11.052
关键词
ZnO NWs; Branched hierarchical; Photocatalyst; Kinetic model
类别
资金
- Research Council of the Sharif University of Technology
- Iran National Science Foundation (INSF) through Research Chair Award of Surface and Interface Physics [940009]
Branched hierarchical zinc oxide nanowires (BH-ZnO NWs) were fabricated successfully by a facile and rapid synthesis using two-step growth process. Initially, ZnO NWs have been prepared by anodizing zinc foil at room temperature and followed by annealing treatment. Then, the BH-ZnO NWs were grown on the ZnO NWs by a solution based method at very low temperature (31 degrees C). The BH-ZnO NWs with different aspect ratio were obtained by varying reaction time (0.5, 2, 5, 10 h). Photocatalytic activity of the samples was studied under both UV and visible light. The results indicated that the optimized BH-ZnO NWs (5 h) as a photocatalyst exhibited the highest photoactivity with about 3 times higher than the ZnO NWs under UV light. In addition, it was also determined that photodegradation rate constant (k) for the BH- ZnO NWs surface obeys a linear function with the branch length (1) and their correlation was described by using a proposed kinetic model. (C) 2017 Elsevier B.V. All rights reserved.
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