研究目的
To develop a facile fabrication method for phosphorus-doped graphitic carbon nitride (P-g-C3N4) and evaluate its enhanced visible light photocatalytic degradation performance toward textile dyes.
研究成果
P-doped g-C3N4 fabricated with triphenylphosphine shows enhanced photocatalytic performance for dye degradation under visible light due to improved light harvesting, increased surface area, and modified electronic properties that reduce charge carrier recombination. The material exhibits good stability and involves superoxide anion radicals and holes in the degradation mechanism.
研究不足
The study may have limitations in scalability of the synthesis method, potential environmental impact of using triphenylphosphine, and the need for further optimization of doping levels and application to other pollutants.
1：Experimental Design and Method Selection:
The study involved synthesizing P-doped g-C3N4 via in situ thermal copolymerization of urea and triphenylphosphine, followed by characterization using various techniques to assess structural and electronic properties, and photocatalytic activity tests under visible light irradiation.
2：Sample Selection and Data Sources:
Samples included pristine g-C3N4 and P-g-C3N4 with different phosphorus doping levels (0.25, 0.5, 0.75 wt%), prepared from urea and triphenylphosphine. Data were obtained from laboratory experiments.
3：25, 5, 75 wt%), prepared from urea and triphenylphosphine. Data were obtained from laboratory experiments.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a muffle furnace for calcination, JEM-2100F TEM, D/max-2550 XRD, UV–vis TU-1901 spectrophotometer, PHI 5400 XPS, Quadrasorb SI-MP system for BET surface area, and a 500W Xe lamp for photocatalytic tests. Materials included urea, triphenylphosphine, absolute ethyl alcohol, deionized water, rhodamine B, acid blue D-2BR dye, BaSO4, 1,4-benzoquinone, and ethylene diamine tetra-acetic acid.
4：Experimental Procedures and Operational Workflow:
The synthesis involved dissolving triphenylphosphine in ethanol, dispersing urea via ultrasonication, stirring, evaporation, drying, calcination at 500°C for 2 hours, washing, and drying. Characterization was done using TEM, XRD, DRS, XPS, and BET analysis. Photocatalytic tests involved dispersing photocatalyst in dye solution, achieving adsorption-desorption equilibrium in dark, irradiating with Xe lamp, sampling at intervals, centrifuging, and measuring absorbance with UV-vis spectrophotometer.
5：Data Analysis Methods:
Data were analyzed using BET method for surface area, BJH method for pore size distribution, Kubelka-Munk function for band gap estimation, and calculation of degradation efficiency (C/C0). Statistical analysis was not explicitly mentioned.
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