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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.8b00401
|2 doi
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|a pubmed25n0948.xml
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|a (NLM)29809011
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Fernando, Joseph F S
|e verfasserin
|4 aut
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|a Photocatalysis with Pt-Au-ZnO and Au-ZnO Hybrids
|b Effect of Charge Accumulation and Discharge Properties of Metal Nanoparticles
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 17.09.2018
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|a Date Revised 17.09.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Metal-semiconductor hybrid nanomaterials are becoming increasingly popular for photocatalytic degradation of organic pollutants. Herein, a seed-assisted photodeposition approach is put forward for the site-specific growth of Pt on Au-ZnO particles (Pt-Au-ZnO). A similar approach was also utilized to enlarge the Au nanoparticles at epitaxial Au-ZnO particles (AuAu-ZnO). An epitaxial connection at the Au-ZnO interface was found to be critical for the site-specific deposition of Pt or Au. Light on-off photocatalysis tests, utilizing a thiazine dye (toluidine blue) as a model organic compound, were conducted and confirmed the superior photodegradation properties of Pt-Au-ZnO hybrids compared to Au-ZnO. In contrast, Au-ZnO type hybrids were more effective toward photoreduction of toluidine blue to leuco-toluidine blue. It was deemed that photoexcited electrons of Au-ZnO (Au, ∼5 nm) possessed high reducing power owing to electron accumulation and negative shift in Fermi level/redox potential; however, exciton recombination due to possible Fermi-level equilibration slowed down the complete degradation of toluidine blue. In the case of Au@Au-ZnO (Au, ∼15 nm), the photodegradation efficiency was enhanced and the photoreduction rate reduced compared to Au-ZnO. Pt-Au-ZnO hybrids showed better photodegradation and mineralization properties compared to both Au-ZnO and Au@Au-ZnO owing to a fast electron discharge (i.e. better electron-hole seperation). However, photoexcited electrons lacked the reducing power for the photoreduction of toluidine blue. The ultimate photodegradation efficiencies of Pt-Au-ZnO, Au@Au-ZnO, and Au-ZnO were 84, 66, and 39%, respectively. In the interest of effective metal-semiconductor type photocatalysts, the present study points out the importance of choosing the right metal, depending on whether a photoreduction and/or photodegradation process is desired
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Shortell, Matthew P
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Firestein, Konstantin L
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Chao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Larionov, Konstantin V
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Popov, Zakhar I
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Sorokin, Pavel B
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bourgeois, Laure
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Waclawik, Eric R
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Golberg, Dmitri V
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1985
|g 34(2018), 25 vom: 26. Juni, Seite 7334-7345
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:34
|g year:2018
|g number:25
|g day:26
|g month:06
|g pages:7334-7345
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|u http://dx.doi.org/10.1021/acs.langmuir.8b00401
|3 Volltext
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