研究目的
To prepare Cu-doped CeO2 nanoparticles using the citrate combustion method and study their crystalline phase evolution, micro morphology, and photocatalytic performance, particularly in degrading methylene blue under different light sources.
研究成果
Cu-doped CeO2 nanoparticles were successfully synthesized, with up to 20 mol% Cu dissolved into the CeO2 structure at temperatures below 600°C. The 5% Cu-doped sample exhibited the highest photocatalytic activity under visible light, achieving 91.74% degradation of methylene blue, due to optimal oxygen vacancy formation. Higher doping levels caused agglomeration and CuO phase separation, reducing efficiency. The method shows potential for visible-light photocatalysis applications.
研究不足
The study is limited to the citrate combustion method and specific calcination temperatures; other synthesis methods or conditions were not explored. The photocatalytic tests were conducted under low-power light sources, which may not fully represent industrial applications. High doping concentrations (>5% Cu) led to agglomeration and reduced activity, indicating optimization is needed for higher dopant levels.
1：Experimental Design and Method Selection:
The citrate combustion method was used for synthesis, involving the use of cerium nitrate hexahydrate, copper nitrate trihydrate, and ammonium citrate tribasic as raw materials. The method was chosen for its simplicity and ability to produce ultrafine particles with good dispersion.
2：Sample Selection and Data Sources:
Samples with copper contents of 0%, 3%, 5%, 7%, 10%, 15%, 20%, and 30% molar ratio of Cu/(Cu+Ce) were prepared. Precursors were calcined at 400, 500, 600, and 700°C for 3 hours.
3：List of Experimental Equipment and Materials:
Equipment included a thermal gravimetric analyzer (STA-409-PC, Netzsch), X-ray diffractometer (DX-2700, Dangdong fangyuan), field-emission scanning electron microscope (INSPECT-F, FEI), X-ray energy-dispersive spectrometer (INCA, Oxford), ultraviolet analyzer (ZF-90D, Shanghai Guanghao Analytic Instruments), and UV-vis spectrophotometer (UV-5500, Shanghai Metash Instruments). Materials included cerium nitrate hexahydrate (>
4：9%, Sinopharm Chemical Reagent), copper nitrate trihydrate (>99%, Shanghai Aladdin Bio-Chem Technology), ammonium citrate tribasic (>5%, Shanghai Aladdin Bio-Chem Technology), and methylene blue (Shanghai Aladdin Bio-Chem Technology). Experimental Procedures and Operational Workflow:
Raw materials were dissolved in water, mixed with ammonium citrate tribasic, stirred, dried at 120°C, ground, and calcined. Characterization involved DTA-TGA, XRD, SEM/EDX, and photocatalytic degradation tests using methylene blue solution under UV (254 nm and 365 nm) and visible light (three-band fluorescent lamp) irradiation.
5：Data Analysis Methods:
XRD data were analyzed using Scherrer's formula for crystallite size. Photocatalytic degradation rate was calculated as D = (C0 - Ct)/C0, where C0 and Ct are initial and time-t concentrations of methylene blue, measured by UV-vis spectrophotometry.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
