Enhanced Photocatalytic Activity of Nanoparticle-Aggregated Ag–AgX(X = Cl, Br)@TiO2 Microspheres Under Visible Light
Abstract Ag–AgX(X = Cl, Br)@TiO2 nanoparticle-aggregated spheres with different mass ratio of R = TiO2/Ag(X) from 35:1 to 5:1 were synthesized by a facile sol–gel technique with post-photoreduction. The photocatalytic activities of both Ag–AgCl@TiO2 and Ag–AgBr@TiO2 under visible light are effective...
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Format: | Article |
Language: | English |
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SpringerOpen
2017-07-01
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Series: | Nano-Micro Letters |
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Online Access: | http://link.springer.com/article/10.1007/s40820-017-0150-8 |
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author | Cuiling Zhang Hao Hua Jianlin Liu Xiangyu Han Qipeng Liu Zidong Wei Chengbin Shao Chenguo Hu |
author_facet | Cuiling Zhang Hao Hua Jianlin Liu Xiangyu Han Qipeng Liu Zidong Wei Chengbin Shao Chenguo Hu |
author_sort | Cuiling Zhang |
collection | DOAJ |
description | Abstract Ag–AgX(X = Cl, Br)@TiO2 nanoparticle-aggregated spheres with different mass ratio of R = TiO2/Ag(X) from 35:1 to 5:1 were synthesized by a facile sol–gel technique with post-photoreduction. The photocatalytic activities of both Ag–AgCl@TiO2 and Ag–AgBr@TiO2 under visible light are effectively improved by ~3 times relative to TiO2 NPAS under the simulated sunlight for the decomposition of methyl orange (MO). Ag–AgBr@TiO2 showed 30% improvement and less stable in photocatalytic activity than that of AgCl@TiO2. The role of Ag and AgX nanoparticles on the surface of Ag–AgX(X = Cl, Br)@TiO2 was discussed. Ag on these samples not only can efficiently harvest visible light especially for AgCl, but also efficiently separate excited electrons and holes via the fast electron transfer from AgX(X = Cl, Br) to metal Ag nanoparticles and then to TiO2-aggregated spheres on the surface of heterostructure. On the basis of their efficient and stable photocatalytic activities under visible-light irradiation, these photocatalysts could be widely used for degradation of organic pollutants in aqueous solution. |
first_indexed | 2024-12-21T01:30:36Z |
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id | doaj.art-901f7dbc03f846e1832e6a459df6f7f7 |
institution | Directory Open Access Journal |
issn | 2311-6706 2150-5551 |
language | English |
last_indexed | 2024-12-21T01:30:36Z |
publishDate | 2017-07-01 |
publisher | SpringerOpen |
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series | Nano-Micro Letters |
spelling | doaj.art-901f7dbc03f846e1832e6a459df6f7f72022-12-21T19:20:23ZengSpringerOpenNano-Micro Letters2311-67062150-55512017-07-019411310.1007/s40820-017-0150-8Enhanced Photocatalytic Activity of Nanoparticle-Aggregated Ag–AgX(X = Cl, Br)@TiO2 Microspheres Under Visible LightCuiling Zhang0Hao Hua1Jianlin Liu2Xiangyu Han3Qipeng Liu4Zidong Wei5Chengbin Shao6Chenguo Hu7Chongqing Engineering Laboratory for Detection, Control and Integrated System, Chongqing Technology and Business UniversityCollege of Chemistry and Chemical Engineering, College of Physics, Chongqing UniversityCollege of Chemistry and Chemical Engineering, College of Physics, Chongqing UniversityCollege of Chemistry and Chemical Engineering, College of Physics, Chongqing UniversityCollege of Chemistry and Chemical Engineering, College of Physics, Chongqing UniversityCollege of Chemistry and Chemical Engineering, College of Physics, Chongqing UniversityChongqing Engineering Laboratory for Detection, Control and Integrated System, Chongqing Technology and Business UniversityCollege of Chemistry and Chemical Engineering, College of Physics, Chongqing UniversityAbstract Ag–AgX(X = Cl, Br)@TiO2 nanoparticle-aggregated spheres with different mass ratio of R = TiO2/Ag(X) from 35:1 to 5:1 were synthesized by a facile sol–gel technique with post-photoreduction. The photocatalytic activities of both Ag–AgCl@TiO2 and Ag–AgBr@TiO2 under visible light are effectively improved by ~3 times relative to TiO2 NPAS under the simulated sunlight for the decomposition of methyl orange (MO). Ag–AgBr@TiO2 showed 30% improvement and less stable in photocatalytic activity than that of AgCl@TiO2. The role of Ag and AgX nanoparticles on the surface of Ag–AgX(X = Cl, Br)@TiO2 was discussed. Ag on these samples not only can efficiently harvest visible light especially for AgCl, but also efficiently separate excited electrons and holes via the fast electron transfer from AgX(X = Cl, Br) to metal Ag nanoparticles and then to TiO2-aggregated spheres on the surface of heterostructure. On the basis of their efficient and stable photocatalytic activities under visible-light irradiation, these photocatalysts could be widely used for degradation of organic pollutants in aqueous solution.http://link.springer.com/article/10.1007/s40820-017-0150-8Ag–AgX(X = Cl, Br)@TiO2Nanoparticle-aggregated spheresMethyl orangeVisible lightPhotocatalysis |
spellingShingle | Cuiling Zhang Hao Hua Jianlin Liu Xiangyu Han Qipeng Liu Zidong Wei Chengbin Shao Chenguo Hu Enhanced Photocatalytic Activity of Nanoparticle-Aggregated Ag–AgX(X = Cl, Br)@TiO2 Microspheres Under Visible Light Nano-Micro Letters Ag–AgX(X = Cl, Br)@TiO2 Nanoparticle-aggregated spheres Methyl orange Visible light Photocatalysis |
title | Enhanced Photocatalytic Activity of Nanoparticle-Aggregated Ag–AgX(X = Cl, Br)@TiO2 Microspheres Under Visible Light |
title_full | Enhanced Photocatalytic Activity of Nanoparticle-Aggregated Ag–AgX(X = Cl, Br)@TiO2 Microspheres Under Visible Light |
title_fullStr | Enhanced Photocatalytic Activity of Nanoparticle-Aggregated Ag–AgX(X = Cl, Br)@TiO2 Microspheres Under Visible Light |
title_full_unstemmed | Enhanced Photocatalytic Activity of Nanoparticle-Aggregated Ag–AgX(X = Cl, Br)@TiO2 Microspheres Under Visible Light |
title_short | Enhanced Photocatalytic Activity of Nanoparticle-Aggregated Ag–AgX(X = Cl, Br)@TiO2 Microspheres Under Visible Light |
title_sort | enhanced photocatalytic activity of nanoparticle aggregated ag agx x cl br tio2 microspheres under visible light |
topic | Ag–AgX(X = Cl, Br)@TiO2 Nanoparticle-aggregated spheres Methyl orange Visible light Photocatalysis |
url | http://link.springer.com/article/10.1007/s40820-017-0150-8 |
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