研究目的
To synthesize and characterize graphene/TiO2 composites using different titanium alkoxide precursors and evaluate their photocatalytic activity towards the degradation of methylene blue under UV irradiation.
研究成果
The study successfully synthesized graphene/TiO2 composites with different titanium alkoxide precursors. The sample GTNB showed the best photocatalytic activity for methylene blue degradation. The enhanced activity is attributed to the strong coupling between TiO2 and graphene, which inhibits electron-hole recombination and promotes dye degradation.
研究不足
The BET surface area of the composites was much lower than that of graphenes, indicating potential issues with TiO2 particle agglomeration and reduced adsorption ability. The presence of impure elements in some samples may affect the photocatalytic performance.
1：Experimental Design and Method Selection:
Sol-gel technique was used to synthesize graphene/TiO2 composites with different titanium alkoxide precursors (TNB, TIP, TPP).
2：Sample Selection and Data Sources:
Graphene oxide was prepared from graphite using the Hummers-Offeman method. Titanium alkoxide precursors were dissolved in benzene and mixed with graphene oxide.
3：List of Experimental Equipment and Materials:
Digital sonifer for ultrasonication, SEM (JSM-5200 JOEL), TEM (JEOL, JEM-2010), XRD (Shimatz XD-D1), UV-visible spectrophotometer (Neosys-2000), BET analyzer (Monosorb).
4：Experimental Procedures and Operational Workflow:
The mixtures were stirred and heat-treated at 973 K for 1 h. The composites were characterized and their photocatalytic activity was evaluated by degrading methylene blue under UV light.
5：Data Analysis Methods:
The photocatalytic degradation was analyzed using UV-visible spectroscopy, and the kinetics were studied using the Langmuir-Hinshelwood model.
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SEM
JSM-5200 JOEL
JOEL
Used to analyze the morphologies of the photocatalysts.
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TEM
JEM-2010
JEOL
Used to examine the size and distribution of the photocatalysts.
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titanium(IV) n-butoxide
TNB
Acros Organics
Precursor for TiO2 formation in the sol-gel synthesis of graphene/TiO2 composites.
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titanium(IV) isopropoxide
TIP
Kanto Chemical Company
Precursor for TiO2 formation in the sol-gel synthesis of graphene/TiO2 composites.
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titanium(IV) propoxide
TPP
Aldrich Chemical Company
Precursor for TiO2 formation in the sol-gel synthesis of graphene/TiO2 composites.
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benzene
Samchun Pure Chemical Co., Ltd
Organic solvent used in the synthesis of graphene/TiO2 composites.
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methylene blue
Dukan Pure Chemical Co., Ltd
Dye used to evaluate the photocatalytic activity of the graphene/TiO2 composites.
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XRD
XD-D1
Shimatz
Used to obtain crystallographic structure of the composites photocatalysts.
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UV-visible spectrophotometer
Neosys-2000
Used to measure UV-visible absorbance spectra of the samples.
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BET analyzer
Monosorb
Used to determine the BET surface areas of the photocatalysts.
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