Dependence of photocatalytic activity of ZnxCd1-xS quantum dot composition

doi:10.1016/S1872-2067(14)60269-2

催化学报 ›› 2015, Vol. 36 ›› Issue (3): 328-335.DOI: 10.1016/S1872-2067(14)60269-2

Dependence of photocatalytic activity of Zn_xCd_1-xS quantum dot composition

Alice Hospodková^a, Ladislav Svoboda^b,c, Petr Praus^b,c

a Institute of Physics of the Academy of Sciences of the Czech Republic, v. v. i., CZ-16200 Prague 6, Czech Republic;
b Department of Chemistry, VŠB-Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava-Poruba, Czech Republic;
c Institute of Environmental Technology, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, Ostrava 708 33, Czech Republic

收稿日期:2014-11-26 修回日期:2014-11-26 出版日期:2015-02-14 发布日期:2015-02-14
通讯作者: Petr Praus

Dependence of photocatalytic activity of Zn_xCd_1-xS quantum dot composition

Alice Hospodková^a, Ladislav Svoboda^b,c, Petr Praus^b,c

a Institute of Physics of the Academy of Sciences of the Czech Republic, v. v. i., CZ-16200 Prague 6, Czech Republic;
b Department of Chemistry, VŠB-Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava-Poruba, Czech Republic;
c Institute of Environmental Technology, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, Ostrava 708 33, Czech Republic

Received:2014-11-26 Revised:2014-11-26 Online:2015-02-14 Published:2015-02-14
Supported by:
This work was 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"and by VŠB-Technical University of Ostrava (SP 2014/55).

摘要/Abstract

摘要：

Aqueous colloidal dispersions containing Zn_xCd_1-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 Zn_xCd_1-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 photocatalytic 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.

关键词: Quantum dot, Zn_xCd_1-xS, Photocatalysis, Quantum level

Abstract:

Key words: Quantum dot, Zn_xCd_1-x, SPhotocatalysis, Quantum level

Alice Hospodková, Ladislav Svoboda, Petr Praus. Dependence of photocatalytic activity of Zn_xCd_1-xS quantum dot composition[J]. 催化学报, 2015, 36(3): 328-335.

Alice Hospodková, Ladislav Svoboda, Petr Praus. Dependence of photocatalytic activity of Zn_xCd_1-xS quantum dot composition[J]. Chinese Journal of Catalysis, 2015, 36(3): 328-335.

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Dependence of photocatalytic activity of Zn_xCd_1-xS quantum dot composition

Dependence of photocatalytic activity of Zn_xCd_1-xS quantum dot composition

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