Preparation of ZnO with micro/nano hierarchical structure and its photocatalytic performances
Two different morphological ZnO materials with hierarchical micro/nano structures were fabricated through solvothermal method and oxalate method, respectively. Their photocatalytic performances were evaluated by using the degradation of methylene blue (MB) solution as model reaction. The results sho...
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Journal of Materials Engineering
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doaj-f57bbe52339745ed82035a8f79eedb722021-08-18T02:42:32ZzhoJournal of Materials EngineeringJournal of Materials Engineering1001-43811001-43812021-04-0149415015810.11868/j.issn.1001-4381.2020.00055120210417Preparation of ZnO with micro/nano hierarchical structure and its photocatalytic performancesXIANG Xiao-qian0LIAO Xiao-gang1LI Gang2HU Xue-bu3TIAN Tian4College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, ChinaCollege of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, ChinaCollege of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, ChinaCollege of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, ChinaCollege of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, ChinaTwo different morphological ZnO materials with hierarchical micro/nano structures were fabricated through solvothermal method and oxalate method, respectively. Their photocatalytic performances were evaluated by using the degradation of methylene blue (MB) solution as model reaction. The results show that the product <i>via</i> solvothermal method exhibits flower-like micro-spherical appearance assembled by many nano-flakes, while its counterpart derived from oxalate strategy shows micro-rod like morphology constructed by many nanoparticles. ZnO fabricated by oxalate method has much better photocatalytic activity towards MB degradation, whose reaction rate constant is 7.65 times as high as that one obtained by solvothermal method. The identification results for active radicals verify that ·OH and ·O<sub>2</sub><sup>-</sup> are both formed in the two samples when they are irradiated under ultraviolet light. However, due to their diverse band structures, there is difference in number of active radicals produced in the reaction system, which can further lead to different photocatalytic efficiency for MB degradation. As for oxalate-derived ZnO, greater number of ·OH and ·O<sub>2</sub><sup>-</sup> can be formed under the irradiation of ultraviolet light. Meanwhile, ·OH with strong oxidation capacity plays a dominant role in the photocatalytic reaction system. As a result, it possesses more excellent property in degradation of MB than that of ZnO originated from solvothermal method.http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000551znosolvothermal methodoxalate methodphotocatalysisoxygen vacancy |
collection |
DOAJ |
language |
zho |
format |
Article |
sources |
DOAJ |
author |
XIANG Xiao-qian LIAO Xiao-gang LI Gang HU Xue-bu TIAN Tian |
spellingShingle |
XIANG Xiao-qian LIAO Xiao-gang LI Gang HU Xue-bu TIAN Tian Preparation of ZnO with micro/nano hierarchical structure and its photocatalytic performances Journal of Materials Engineering zno solvothermal method oxalate method photocatalysis oxygen vacancy |
author_facet |
XIANG Xiao-qian LIAO Xiao-gang LI Gang HU Xue-bu TIAN Tian |
author_sort |
XIANG Xiao-qian |
title |
Preparation of ZnO with micro/nano hierarchical structure and its photocatalytic performances |
title_short |
Preparation of ZnO with micro/nano hierarchical structure and its photocatalytic performances |
title_full |
Preparation of ZnO with micro/nano hierarchical structure and its photocatalytic performances |
title_fullStr |
Preparation of ZnO with micro/nano hierarchical structure and its photocatalytic performances |
title_full_unstemmed |
Preparation of ZnO with micro/nano hierarchical structure and its photocatalytic performances |
title_sort |
preparation of zno with micro/nano hierarchical structure and its photocatalytic performances |
publisher |
Journal of Materials Engineering |
series |
Journal of Materials Engineering |
issn |
1001-4381 1001-4381 |
publishDate |
2021-04-01 |
description |
Two different morphological ZnO materials with hierarchical micro/nano structures were fabricated through solvothermal method and oxalate method, respectively. Their photocatalytic performances were evaluated by using the degradation of methylene blue (MB) solution as model reaction. The results show that the product <i>via</i> solvothermal method exhibits flower-like micro-spherical appearance assembled by many nano-flakes, while its counterpart derived from oxalate strategy shows micro-rod like morphology constructed by many nanoparticles. ZnO fabricated by oxalate method has much better photocatalytic activity towards MB degradation, whose reaction rate constant is 7.65 times as high as that one obtained by solvothermal method. The identification results for active radicals verify that ·OH and ·O<sub>2</sub><sup>-</sup> are both formed in the two samples when they are irradiated under ultraviolet light. However, due to their diverse band structures, there is difference in number of active radicals produced in the reaction system, which can further lead to different photocatalytic efficiency for MB degradation. As for oxalate-derived ZnO, greater number of ·OH and ·O<sub>2</sub><sup>-</sup> can be formed under the irradiation of ultraviolet light. Meanwhile, ·OH with strong oxidation capacity plays a dominant role in the photocatalytic reaction system. As a result, it possesses more excellent property in degradation of MB than that of ZnO originated from solvothermal method. |
topic |
zno solvothermal method oxalate method photocatalysis oxygen vacancy |
url |
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000551 |
work_keys_str_mv |
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