研究目的
To develop separation-free TiO2/reduced graphene oxide film catalysts for continuous photocatalysis with enhanced charge transfer and active sites, addressing the challenge of post-separation in water purification.
研究成果
The LbL-assembled TiO2/rGO film catalysts exhibit significantly enhanced photocatalytic activity and stability for continuous photocatalysis, attributed to efficient charge separation via Ti-O-C bonds, increased active sites, and porous structure. This approach offers a cost-effective and scalable solution for water treatment, with potential for further optimization in real-world applications.
研究不足
The study is limited to lab-scale demonstration; scale-up to industrial applications may face challenges in reactor design and cost. The screen effect from multilayer films reduces efficiency with increased layers, and diffusion limitations in inner layers may affect performance. The use of UV light limits applicability to solar-driven systems.
1:Experimental Design and Method Selection:
The study uses layer-by-layer (LbL) assembly to fabricate TiO2/rGO multilayer films on quartz slides, followed by reduction of GO to rGO. A home-made rectangular quartz reactor is used for continuous photocatalysis with circular pumping of pollutant solution under UV irradiation.
2:Sample Selection and Data Sources:
Quartz slides are used as substrates; TiO2 nanoparticles (P25, Degussa) and graphene oxide are assembled. Rhodamine B (RhB) is used as a model pollutant.
3:List of Experimental Equipment and Materials:
Includes quartz slides, TiO2 P25, graphene oxide, poly(ethylenimine) (PEI), poly(styrenesulfonate) (PSS), hydrazine hydrate, RhB, UV-vis spectrometer, SEM, AFM, FTIR, XPS, PL spectrometer, electrochemical workstation, mercury vapor lamp, and pumping system.
4:Experimental Procedures and Operational Workflow:
Clean quartz slides, coat with APTES and PEI, alternate immersion in GO and TiO2 suspensions for LbL assembly, reduce GO to rGO with hydrazine hydrate, assemble slides into arrays in reactor, pump RhB solution under UV light, sample and analyze degradation.
5:Data Analysis Methods:
UV-vis spectroscopy for concentration measurement, pseudo-first-order kinetic model for degradation rate, SEM, AFM, FTIR, XPS, PL, photocurrent, and EIS for characterization.
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SEM
S-4300
Hitachi
Used to obtain scanning electron microscopy images of the multilayer films for surface structure analysis.
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AFM
Nanoscope IIIa
Veeco
Used to measure the thickness of graphene oxide nanosheets.
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FTIR Spectrometer
V70
Bruker
Used to obtain Fourier transform infrared spectroscopy spectra for chemical analysis of the films.
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PL Spectrometer
F-7000
Hitachi
Used to record photoluminescence spectra to study charge carrier recombination.
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TiO2 P25
P25
Degussa
Used as the photocatalyst material in the layer-by-layer assembly for the film catalysts.
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UV-vis Spectrometer
Cary 50
Varian
Used to measure UV-vis absorption spectra for monitoring film assembly and analyzing RhB concentration.
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XPS Spectrometer
ESCALAB-MKII
Not specified
Used for X-ray photoelectron spectroscopy to analyze chemical states and elements in the films.
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Electrochemical Workstation
CHI660D
Not specified
Used for electrochemical measurements including photocurrent response and EIS spectra.
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Mercury Vapor Lamp
300 W
Not specified
Used as the UV light source for photocatalytic degradation experiments.
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