研究目的
To enhance the visible light photocatalytic activity of TiO2 by coupling with NaYF4:(Yb,Er) and CuO nanoparticles.
研究成果
The NaYF4:(Yb,Er)-CuO/TiO2 composite exhibited enhanced visible light photocatalytic activity and some recyclability, making it potentially useful in photocatalyst systems.
研究不足
The recyclability of the NaYF4:(Yb,Er)-CuO/TiO2 composite decreased after each cycle, possibly due to Cu leaching and loss of TiO2 nanoparticles during washing steps.
1：Experimental Design and Method Selection:
The study involved the synthesis of NaYF4:(Yb,Er) phosphor by solution combustion, preparation of CuO nanoparticles, and their coupling with NaYF4:(Yb,Er) by mechanical ball-milling followed by TiO2-sol coating.
2：Sample Selection and Data Sources:
The samples were characterized using XRD, SEM, EDS, particle size analyzer, BET method, PL spectra, and UV-vis spectrophotometry.
3：List of Experimental Equipment and Materials:
Muffle furnace, magnetic stirrer, ball mill, electric oven, XRD, SEM, EDS, particle size analyzer, BET analyzer, fluorescence spectrophotometer, UV-vis spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The synthesis involved combustion, precipitation, ball-milling, coating, drying, and calcination. Photocatalytic activity was examined under visible light irradiation.
5：Data Analysis Methods:
The photocatalytic degradation efficiency was analyzed using UV-vis absorbance measurements.
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Y2O3
99.99%
Daejung Chemicals & Metals Co., Ltd.
Used in the synthesis of NaYF4:(Yb,Er) phosphor.
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Yb2O3
99.9%
Wako Pure Chemical Industries Ltd.
Used in the synthesis of NaYF4:(Yb,Er) phosphor.
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Er2O3
99.9%
Sigma Aldrich
Used in the synthesis of NaYF4:(Yb,Er) phosphor.
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Na2SiF6
98.0%
Duksan Pure Chemical Co., Ltd.
Used as a fuel mixture in the synthesis of NaYF4:(Yb,Er) phosphor.
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CO(NH2)2
99.0%
Samchun Pure Chemical Co., Ltd.
Used as a fuel mixture in the synthesis of NaYF4:(Yb,Er) phosphor.
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NH4HF2
95.0%
Duksan Pure Chemical Co., Ltd.
Used as a fuel mixture in the synthesis of NaYF4:(Yb,Er) phosphor.
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Cu(NO3)2·3H2O
99.5%
Junsei Chemical Co., Ltd.
Used in the preparation of CuO nanoparticles.
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acetic acid
99.0%
Duksan Pure Chemical Co., Ltd.
Used in the preparation of CuO nanoparticles.
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NaOH
Duksan Pure Chemical Co., Ltd.
Used in the preparation of CuO nanoparticles.
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titanium (IV) n-butoxide
99.0%
Acros Organics
Used in the preparation of TiO2-sol.
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ethyl alcohol
99.9%
Duksan Pure Chemical Co., Ltd.
Used in the preparation of TiO2-sol.
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methylene blue
95.0%
Duksan Pure Chemical Co., Ltd.
Used in the photocatalytic activity examination.
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H2O2
28.0%
Duksan Pure Chemical Co., Ltd.
Used as an oxidant in the photocatalytic activity examination.
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