研究目的
Investigating the synthesis and photocatalytic properties of electrodeposited bismuth oxyiodide on a rutile/anatase TiO2 heterostructure for enhanced degradation of methylene blue under UV and visible light.
研究成果
The BiOI modified rutile/anatase TiO2 heterostructure exhibits superior photocatalytic activity under both UV and visible light due to enhanced visible light absorption and efficient charge separation via heterojunction formation. The film shows excellent stability and potential for water pollution treatment and solar energy applications, with hydroxyl and superoxide radicals identified as key active species.
研究不足
The study is limited to laboratory-scale experiments with specific substrates (FTO glass) and conditions; scalability and real-world application efficiency may require further optimization. The use of methylene blue as a model pollutant may not represent all organic contaminants.
1：Experimental Design and Method Selection:
A three-step process was used: dip coating for anatase TiO2 sheet formation, hydrothermal method for rutile TiO2 nanorod growth, and electrochemical deposition for BiOI coating. A three-electrode electrochemical system was employed for BiOI deposition.
2：Sample Selection and Data Sources:
Samples included pure anatase TiO2 sheet, pure rutile TiO2 nanorod arrays, hierarchical TiO2 film, BiOI modified hierarchical TiO2 film, commercial P25 film, and blank FTO glass. All chemicals were analytical reagent grade without further purification.
3：List of Experimental Equipment and Materials:
Equipment included X-ray diffractometer (XRD-6100x, Shimadzu), field-emission scanning electron microscope (FE-SEM SU1510, Hitachi), high-resolution transmission electron microscope (HR-TEM Tecnai G2 F-30, FEI Company), UV-Vis spectrometer (UV-2600, Shimadzu), high-pressure Hg lamp (100 W), Xe lamp (300 W with 420 nm cutoff filter), and electrochemical deposition setup with Ag/AgCl reference electrode and platinum mesh counter electrode. Materials included FTO glass, tetrabutyl titanate (TTBO), isopropyl alcohol (IPA), hydrochloric acid, bismuth nitrate pentahydrate, potassium iodide, p-benzoquinone, absolute ethanol, methylene blue, and others.
4：Experimental Procedures and Operational Workflow:
Anatase TiO2 sheet was formed on FTO glass by dip coating and annealing. Rutile TiO2 nanorods were grown hydrothermally and annealed. BiOI was electrodeposited at -0.1 V for 24 hours. Photocatalytic tests involved stirring MB solution with the film in dark for 1 hour, then irradiating with UV or visible light, and measuring concentration changes over time.
5：1 V for 24 hours. Photocatalytic tests involved stirring MB solution with the film in dark for 1 hour, then irradiating with UV or visible light, and measuring concentration changes over time. Data Analysis Methods:
5. Data Analysis Methods: XRD for crystal structure, SEM and TEM for morphology, UV-Vis for optical properties, and degradation rates calculated from absorbance measurements using UV-Vis spectroscopy.
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X-ray diffractometer
XRD-6100x
Shimadzu
Characterization of crystal structure of samples
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Field-emission scanning electron microscope
SU1510
Hitachi
Observation of surface morphological features of films
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High resolution transmission electron microscope
Tecnai G2 F-30
FEI Company
Further characterization of nanorod structure
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UV-Vis spectrometer
UV-2600
Shimadzu
Acquisition of UV-Vis diffuse reflectance spectra
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High-pressure Hg lamp
UV light source for photocatalytic tests
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Xe lamp
Visible light source for photocatalytic tests
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Ag/AgCl electrode
Reference electrode in electrochemical deposition
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Platinum mesh
Counter electrode in electrochemical deposition
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