研究目的
The effect of synthesis conditions and niobium incorporation levels on the photocatalytic properties of Nb/MCM-41 molecular sieves was assessed.
研究成果
The Nb-MCM-41 mesoporous solids synthesized using the sol-gel method gave a greater photodegradation response than those synthesized through the incipient impregnation method. The highest effectiveness in photodegradation of the methylene blue molecule was obtained with the mesoporous solid synthesized through the sol-gel method, at a level of 20% Nb. This suggests the importance of the method of synthesis used to obtain the mesoporous materials on their functionality.
研究不足
The study acknowledges the need for more systematic studies on both the niobium percentages in the sample and the uniformity of niobium dispersion to better understand their effect on photodegradation capacity. Additionally, the structure obtained through the sol-gel method needs to be determined to understand better the interaction between silica and niobium and the resulting effect on photodegradation.
1：Experimental Design and Method Selection:
The study employed two methods for synthesizing niobium pentoxide supported on MCM-41 mesoporous silica: sol-gel and incipient impregnation, varying the percentage of niobium incorporation.
2：Sample Selection and Data Sources:
The synthesized Nb-MCM-41 ceramic powders were characterized using infrared spectroscopy (IR), Raman spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM).
3：List of Experimental Equipment and Materials:
N-cetyl-N,N,N-trimethylammonium bromide, TEOS, ammonium tris(oxalate) complex of niobium(V), and methylene blue were used.
4：Experimental Procedures and Operational Workflow:
The synthesis involved dissolving N-cetyl-N,N,N-trimethylammonium bromide in a solution, adding TEOS and niobium oxalate, aging the gel, filtering, washing, drying, and calcining. Photodegradation capacity was studied using methylene blue under UV irradiation.
5：Data Analysis Methods:
The photodegradation effect was monitored using UV-Vis spectroscopy, and the degradation percentage was calculated based on absorbance measurements.
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