研究目的
To investigate the photocatalytic degradation of stearic acid and methylene blue using TiO2/SnO2 and SnO2/TiO2 heterostructures under UV irradiation.
研究成果
TiO2/SnO2 heterostructures exhibit superior photocatalytic activity and wettability properties compared to other films, attributed to efficient charge separation, flake-like microstructure, and reduced electron-hole recombination. This makes them promising for self-cleaning applications and pollutant degradation under UV light.
研究不足
The study is limited to specific heterostructures and pollutants under UV irradiation; it does not explore other light sources or broader environmental conditions. The sol-gel method may have variability in film quality, and the focus is on laboratory-scale applications without scalability or long-term stability tests.
1：Experimental Design and Method Selection:
The study uses sol-gel technique to prepare single-layer SnO2 and TiO2 films, as well as SnO2/TiO2 and TiO2/SnO2 heterostructures on borosilicate glass substrates. The design aims to compare photocatalytic activities and wettability properties.
2：Sample Selection and Data Sources:
Samples include thin films of SnO2, TiO2, SnO2/TiO2, and TiO2/SnO2. Data sources involve characterization techniques such as XRD, FESEM, HRTEM, UV-Vis spectroscopy, contact angle measurements, and photoluminescence spectroscopy.
3：Data sources involve characterization techniques such as XRD, FESEM, HRTEM, UV-Vis spectroscopy, contact angle measurements, and photoluminescence spectroscopy. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes spin coater, oven for annealing, UV-Vis spectrophotometer (Agilent Cary 60), contact angle meter (DMs-401, Kyowa Interface Science CO LTD, Japan), X-ray diffractometer (Rigaku Ultima IV), FESEM (Carl Zeiss Sigma VP), HRTEM (Tecnai 20 G2 STwin, FEI), surface profilometer (XP 100, Ambios Technology, USA), and fluorescence spectrophotometer (Cary eclipse). Materials include SnCl2·2H2O, ethanol, polyethylene glycol (PEG-4000), TiO2 sol, borosilicate glass substrates, stearic acid, methylene blue, deionized water, diiodomethane, and terephthalic acid.
4：Experimental Procedures and Operational Workflow:
Films are prepared by spin coating sols on substrates, drying at 120°C, and annealing at 500°C. Wettability is measured using sessile drop method with water and diiodomethane. Photocatalytic degradation tests involve UV irradiation of films with adsorbed stearic acid or in methylene blue solution, with monitoring via contact angle changes and absorbance spectra. Hydroxyl radical detection uses photoluminescence with terephthalic acid.
5：Data Analysis Methods:
Data analysis includes calculating crystallite size from XRD using the Williamson-Hall equation, surface energy using Owens and Wendt model, photocatalytic efficiency from absorbance changes, rate constants from pseudo-first-order kinetics, and hydroxyl radical production from PL intensity trends.
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UV-Vis Spectrophotometer
Cary 60
Agilent
Used to obtain spectral transmission curves and absorbance spectra between 300–800 nm for the thin films.
Cary 60 UV-Vis Spectrophotometer
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X-ray Diffractometer
Ultima IV
Rigaku
Used to record X-ray diffraction patterns in the 2θ range of 20°–80° with Cu Kα radiation.
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FESEM
Sigma VP
Carl Zeiss
Used to examine surface morphology and elemental composition with energy dispersive X-ray analysis.
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HRTEM
Tecnai 20 G2 STwin
FEI
Used to acquire high-resolution transmission electron microscopy images, operated at 200 kV.
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Fluorescence Spectrophotometer
Cary eclipse
Agilent
Used to obtain photoluminescence spectra at an excitation wavelength of 315 nm.
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Contact Angle Meter
DMs-401
Kyowa Interface Science CO LTD
Used to investigate wetting properties based on the sessile drop method with deionized water droplets.
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Surface Profilometer
XP 100
Ambios Technology
Used to measure film thickness.
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