One-Pot Template-Free Hydrothermal Synthesis of Monoclinic Hollow Microspheres and Their Enhanced Visible-Light Photocatalytic Activity
Monoclinic-phase BiVO4 hollow microspheres with diameters of about 2–4 μm have been successfully fabricated in high yield by a one-pot template-free hydrothermal route. The reaction duration and urea concentration are shown to play important roles in the formation of the BiVO4 hollow microspheres. X...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2012-01-01
|
| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2012/797968 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832555567900524544 |
|---|---|
| author | Bei Cheng Wenguang Wang Lei Shi Jun Zhang Jingrun Ran Huogen Yu |
| author_facet | Bei Cheng Wenguang Wang Lei Shi Jun Zhang Jingrun Ran Huogen Yu |
| author_sort | Bei Cheng |
| collection | DOAJ |
| description | Monoclinic-phase BiVO4 hollow microspheres with diameters of about 2–4 μm have been successfully fabricated in high yield by a one-pot template-free hydrothermal route. The reaction duration and urea concentration are shown to play important roles in the formation of the BiVO4 hollow microspheres. X-ray diffraction, scanning electron microscopy, nitrogen adsorption-desorption isotherms, fourier transform infrared spectrometry, and UV-visible diffuse reflectance spectroscopy are used to characterize the products. The results show that all the as-prepared BiVO4 samples have monoclinic phase structure and exhibit good crystallinity. A formation mechanism for the BiVO4 hollow spherical structure via a localized Ostwald ripening is proposed based on the experimental observations. In addition, studies of the photocatalytic properties by exposure to visible light irradiation demonstrate that the as-obtained BiVO4 hollow spheres show potential photocatalytic application. Hydroxyl radicals (•OH) are not detected on the surface of visible-light-illuminated BiVO4 by the photoluminescence technique, suggesting that •OH is not the dominant photooxidant and photogenerated hole could directly take part in photocatalytic reaction. The prepared BiVO4 hollow spheres are also of great interest in pigment, catalysis, separation technology, biomedical engineering, and nanotechnology. |
| format | Article |
| id | doaj-art-ddff5deb3f7746d2a323a569fe229155 |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-ddff5deb3f7746d2a323a569fe2291552025-02-03T05:47:58ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2012-01-01201210.1155/2012/797968797968One-Pot Template-Free Hydrothermal Synthesis of Monoclinic Hollow Microspheres and Their Enhanced Visible-Light Photocatalytic ActivityBei Cheng0Wenguang Wang1Lei Shi2Jun Zhang3Jingrun Ran4Huogen Yu5State Key Laboratory of Silicate Materials for Architectures, Materials College, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, ChinaState Key Laboratory of Silicate Materials for Architectures, Materials College, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, ChinaState Key Laboratory of Silicate Materials for Architectures, Materials College, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, ChinaState Key Laboratory of Silicate Materials for Architectures, Materials College, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, ChinaState Key Laboratory of Silicate Materials for Architectures, Materials College, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, ChinaDepartment of Chemistry, School of Science, Wuhan University of Technology, Wuhan 430070, ChinaMonoclinic-phase BiVO4 hollow microspheres with diameters of about 2–4 μm have been successfully fabricated in high yield by a one-pot template-free hydrothermal route. The reaction duration and urea concentration are shown to play important roles in the formation of the BiVO4 hollow microspheres. X-ray diffraction, scanning electron microscopy, nitrogen adsorption-desorption isotherms, fourier transform infrared spectrometry, and UV-visible diffuse reflectance spectroscopy are used to characterize the products. The results show that all the as-prepared BiVO4 samples have monoclinic phase structure and exhibit good crystallinity. A formation mechanism for the BiVO4 hollow spherical structure via a localized Ostwald ripening is proposed based on the experimental observations. In addition, studies of the photocatalytic properties by exposure to visible light irradiation demonstrate that the as-obtained BiVO4 hollow spheres show potential photocatalytic application. Hydroxyl radicals (•OH) are not detected on the surface of visible-light-illuminated BiVO4 by the photoluminescence technique, suggesting that •OH is not the dominant photooxidant and photogenerated hole could directly take part in photocatalytic reaction. The prepared BiVO4 hollow spheres are also of great interest in pigment, catalysis, separation technology, biomedical engineering, and nanotechnology.http://dx.doi.org/10.1155/2012/797968 |
| spellingShingle | Bei Cheng Wenguang Wang Lei Shi Jun Zhang Jingrun Ran Huogen Yu One-Pot Template-Free Hydrothermal Synthesis of Monoclinic Hollow Microspheres and Their Enhanced Visible-Light Photocatalytic Activity International Journal of Photoenergy |
| title | One-Pot Template-Free Hydrothermal Synthesis of Monoclinic Hollow Microspheres and Their Enhanced Visible-Light Photocatalytic Activity |
| title_full | One-Pot Template-Free Hydrothermal Synthesis of Monoclinic Hollow Microspheres and Their Enhanced Visible-Light Photocatalytic Activity |
| title_fullStr | One-Pot Template-Free Hydrothermal Synthesis of Monoclinic Hollow Microspheres and Their Enhanced Visible-Light Photocatalytic Activity |
| title_full_unstemmed | One-Pot Template-Free Hydrothermal Synthesis of Monoclinic Hollow Microspheres and Their Enhanced Visible-Light Photocatalytic Activity |
| title_short | One-Pot Template-Free Hydrothermal Synthesis of Monoclinic Hollow Microspheres and Their Enhanced Visible-Light Photocatalytic Activity |
| title_sort | one pot template free hydrothermal synthesis of monoclinic hollow microspheres and their enhanced visible light photocatalytic activity |
| url | http://dx.doi.org/10.1155/2012/797968 |
| work_keys_str_mv | AT beicheng onepottemplatefreehydrothermalsynthesisofmonoclinichollowmicrospheresandtheirenhancedvisiblelightphotocatalyticactivity AT wenguangwang onepottemplatefreehydrothermalsynthesisofmonoclinichollowmicrospheresandtheirenhancedvisiblelightphotocatalyticactivity AT leishi onepottemplatefreehydrothermalsynthesisofmonoclinichollowmicrospheresandtheirenhancedvisiblelightphotocatalyticactivity AT junzhang onepottemplatefreehydrothermalsynthesisofmonoclinichollowmicrospheresandtheirenhancedvisiblelightphotocatalyticactivity AT jingrunran onepottemplatefreehydrothermalsynthesisofmonoclinichollowmicrospheresandtheirenhancedvisiblelightphotocatalyticactivity AT huogenyu onepottemplatefreehydrothermalsynthesisofmonoclinichollowmicrospheresandtheirenhancedvisiblelightphotocatalyticactivity |