研究目的
Investigating the hydrothermal synthesis of hexagonal-platelet CuGaO2 and CuGaO2/ZnO hybrids, and their optical band-gap energy and photocatalytic properties.
研究成果
The hydrothermal method successfully synthesized hexagonal-platelet CuGaO2 and CuGaO2/ZnO hybrids at low temperatures. The hybrids exhibited an optical bandgap of 3.1 eV and showed improved photocatalytic activity after annealing in H2 atmosphere, degrading methylene blue to less than 5% after 72 h. This study provides a foundation for future applications in photocatalysis, with potential for further optimization by controlling morphology and increasing surface area.
研究不足
The photocatalytic performance of the hybrids is not as high as that of P25 TiO2, possibly due to lower specific surface area (38 m2/g vs. 51 m2/g for P25). The synthesis parameters for CuGaO2 vary slightly in previous studies, making standardization difficult. Impurity phases like CuO or Cu2O may affect optical properties but were not detected by XRD.
1：Experimental Design and Method Selection:
Hydrothermal synthesis method was used for synthesizing CuGaO2 and CuGaO2/ZnO hybrids, with polyethylene glycol as a morphology-controlling agent. The rationale was to enable low-temperature synthesis compared to traditional methods.
2：Sample Selection and Data Sources:
Samples were prepared with different PEG molecular weights and pH conditions, as detailed in Table 1 and Table
3：Reagents included Cu(NO3)2?5H2O, Ga(NO3)2?8H2O, ethylene glycol, polyethylene glycol (PEG 6,000 and PEG 20,000), KOH, Zn(CH3COO)2?2H2O, and ammonia. List of Experimental Equipment and Materials:
X-ray diffraction (XRD; PANalytical X'pert Pro), scanning electron microscope (SEM; JEOL, JSM-6010LA), transmission electron microscope (TEM; JEOL, JEM-2010), spectrophotometer (V670, JASCO) with integrated sphere (ISN-723, JASCO), energy dispersive X-ray spectrometry (EDS), UV light source (254 nm, ~35 μW/m2), and TiO2 P25 powder (Aeroxide; Nippon Aerosil Co., Ltd) as reference.
4：Experimental Procedures and Operational Workflow:
For CuGaO2 synthesis, precursor solutions were prepared, adjusted to pH
5：0-0 with KOH, reacted in a teflon bomb at 190°C for 56 h, then filtered and washed. For hybrids, Zn(CH3COO)2?2H2O was added with ammonia to pH ~5, reacted at 180°C for 6 h with annealed CuGaOAnnealing was done at 400°C in air or H2 atmosphere. Photocatalytic tests involved degrading methylene blue under UV light. Data Analysis Methods:
XRD for phase identification, SEM and TEM for morphology, EDS for elemental analysis, UV-Vis spectra converted using Kubelka-Munk equation for bandgap calculation, and degradation curves (C(t)/C(0)) for photocatalytic activity.
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