研究目的
To enhance the photocatalytic efficiency of g-C3N4 under dark conditions by coupling it with a phosphorescent material (SEAD) that emits green light after irradiation is discontinued.
研究成果
The SAED/g-C3N4 composite demonstrated enhanced photocatalytic performance under both light and dark conditions, attributed to the phosphorescent material's ability to emit light after irradiation ceased, thus prolonging the photocatalytic activity. This work suggests a novel approach to developing photocatalysts with long lifetime under dark conditions.
研究不足
The study is limited by the specific phosphorescent material used (SAED) and the organic dyes tested. The long-term stability and scalability of the SAED/g-C3N4 composite for industrial applications were not extensively explored.
1：Experimental Design and Method Selection
The study involved the synthesis of SAED/g-C3N4 composite via one-step thermal oxidation and its characterization through various techniques to evaluate its photocatalytic performance under both light and dark conditions.
2：Sample Selection and Data Sources
Urea was used as a precursor for g-C3N4, and europium- and dysprosium-doped strontium aluminate (SAED) was used as the phosphorescent material. Photocatalytic degradation experiments were conducted on methylene blue (MB), methyl orange (MO), and rhodamine B (RhB).
3：List of Experimental Equipment and Materials
Equipment included a 300 W xenon lamp for simulated solar light, UV-vis spectrometer (UV-1800, Shimadzu), FE-SEM (JSM-6700 F, JEOL), TEM (JEM-2100, JEOL), XRD (Bruker DE, Bruker), BET surface area analyzer (Quantachrome Instruments, NT2LX-1), and FT-IR spectrometer (JASCO FT/IR 4600). Materials included urea (DUKSAN) and SAED (Sigma-Aldrich).
4：Experimental Procedures and Operational Workflow
The SAED/g-C3N4 composite was synthesized by heating urea and SAED in a ceramic crucible. Photocatalytic degradation experiments were conducted under simulated solar light and in the dark, with samples extracted at intervals for analysis.
5：Data Analysis Methods
The degradation of dyes was analyzed by measuring absorbance at specific wavelengths using a UV-vis spectrometer. Phosphorescence intensity was measured using a chromameter, and photocurrent density was measured with a potentiostat.
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