| Zn_xCd_(1-x)S量子点组成与其光催化活性的关系（英文） |
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| 引用本文： | Alice Hospodková,Ladislav Svoboda,Petr Praus. Zn_xCd_(1-x)S量子点组成与其光催化活性的关系（英文）[J]. 催化学报, 2015, 0(3): 328-335. DOI: 10.1016/S1872-2067(14)60269-2 |
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| 作者姓名： | Alice Hospodková Ladislav Svoboda Petr Praus |
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| 作者单位： | Institute of Physics of the Academy of Sciences of the Czech Republic,v.v.i.,CZ‐16200 Prague 6,Czech Republic;Department of Chemistry,V?B‐Technical University of Ostrava,17.listopadu 15,708 33 Ostrava‐Poruba,Czech Republic;Institute of Environmental Technology,V?B‐Technical University of Ostrava,17.listopadu 15/2172,Ostrava 708 33,Czech Republic |
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| 基金项目： | supported by the Czech Science Foundation (P107/11/1918);by the Ministry of Education,Youth and Sports of the Czech Republic in the “National Feasibility Program I”,project LO1208 “TEWEP”;by VB‐Technical University of Ostrava (SP 2014/55) |
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| 摘 要： | Aqueous colloidal dispersions containing Znx Cd1‐x S quantum dots (QDs) of different x compositions were prepared by precipitating zinc and cadmium acetates with sodium sulphide,in the presence of a cetyltrimethylammonium bromide stabilizer.Ultraviolet‐visible absorption spectroscopy was used to determine the transition energies of the QDs,which in turn were used to calculate their sizes,which depended on their composition.The QD size decreased with increasing Zn content.The photocatalytic activity of the Znx Cd1‐x S QDs was studied by the decomposition of methylene blue under ultraviolet irradiation,at a maximum intensity at 365 nm (3.4 e V).Three different photo‐catalytic activity regions were observed,which depended on the Zn content.The quantum levels of the QDs could be excited by incident irradiation,and influenced the resulting photocatalytic activity.Maximum photocatalytic activity was achieved at x = 0.6,where the QD transition energy was equal to the irradiation photon energy.The photocatalytic efficiency of the QDs depended on their surface area and arrangement of quantum levels,because of the quantum size effect.
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| 关 键 词： | Quantum dot ZnxCd1-xS Photocatalysis Quantum level |
Dependence of photocatalytic activity of ZnxCd1-xS quantum dot composition |
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| Affiliation: | 1. Institute of Physics of the Academy of Sciences of the Czech Republic, v. v. i., CZ-16200 Prague 6, Czech Republic;2. Department of Chemistry, V?B-Technical University of 0strava, 17. listopadu 15, 708 33 0strava-Poruba, Czech Republic |
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| Abstract: | Aqueous colloidal dispersions containing ZnxCd1‐xS quantum dots (QDs) of different x compositions were prepared by precipitating zinc and cadmium acetates with sodium sulphide, in the presence of a cetyltrimethylammonium bromide stabilizer. Ultraviolet‐visible absorption spectroscopy was used to determine the transition energies of the QDs, which in turn were used to calculate their sizes, which depended on their composition. The QD size decreased with increasing Zn content. The photocatalytic activity of the ZnxCd1‐xS QDs was studied by the decomposition of methylene blue under ultraviolet irradiation, at a maximum intensity at 365 nm (3.4 eV). Three different photo‐catalytic activity regions were observed, which depended on the Zn content. The quantum levels of the QDs could be excited by incident irradiation, and influenced the resulting photocatalytic activity. Maximum photocatalytic activity was achieved at x=0.6, where the QD transition energy was equal to the irradiation photon energy. The photocatalytic efficiency of the QDs depended on their surface area and arrangement of quantum levels, because of the quantum size effect. |
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| Keywords: | Quantum dot ZnxCd1-xS Photocatalysis Quantum level |
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