研究目的
To develop a simple microwave-assisted process to synthesize Ti3+-doped TiO2 (i.e., TiO2-x) using vitamin C as the reducing agent, followed by a photo-reduction process to deposit Ag nanoparticles and form Ag/TiO2-x composites for enhanced photocatalytic activities.
研究成果
The Ag/TiO2-x heterojunction-based photocatalysts exhibit significantly enhanced photocatalytic activity under visible light due to the synergistic effects of Ag plasmonics and Ti3+-doping. This study provides a low-cost and rapid method for synthesizing efficient photocatalytic materials.
研究不足
The study focuses on the synthesis and photocatalytic performance of Ag/TiO2-x composites under visible light. The scalability of the microwave-assisted process and the long-term stability of the photocatalysts under operational conditions were not extensively explored.
1:Experimental Design and Method Selection:
A simple microwave-assisted process was employed to prepare the Ag/TiO2-x composites. The synthesis involved the reduction of TiO2 with vitamin C under microwave radiation, followed by photochemical deposition of Ag particles.
2:Sample Selection and Data Sources:
Pristine macro-/meso-porous TiO2 framework was used as the starting material. The samples were characterized using XPS, XRD, SEM, TEM, STEM, HR-TEM, EPR, BET surface area analysis, and UV–vis absorption spectra.
3:List of Experimental Equipment and Materials:
Microwave reactor (Discover SP 909155), X-ray diffraction (Bruker AXS), X-ray photoelectron spectroscopy (VG Escalab 220i-XL), SEM (S–3400 N), HRTEM and STEM (FEI talos 200X), EPR (MEX-nano spectrometer), BET surface area analyzer (ASAP 2020HD 88), UV–vis spectrophotometer (UV–vis 2550).
4:0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The TiO2-x was prepared by microwave-assisted reduction of TiO2 with vitamin C, followed by photodeposition of Ag nanoparticles. The photocatalytic activities were evaluated through hydrogen production and RhB degradation under visible light.
5:Data Analysis Methods:
The photocatalytic performance was analyzed based on hydrogen production rates and RhB degradation kinetics. The photoelectrochemical properties were evaluated through transient photocurrent responses and electrochemical impedance spectra.
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X-ray diffraction
Bruker AXS
Bruker
Used to confirm the crystallographic structures of the photocatalysts.
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SEM
S–3400 N
Hitachi
Used to observe the morphology of the samples.
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HRTEM and STEM
FEI talos 200X
FEI
Used to obtain high-resolution transmission electron microscopy and scanning transmission electron microscopy images.
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EPR
MEX-nano spectrometer
Bruker
Used to perform electron paramagnetic resonance spectra.
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UV–vis spectrophotometer
UV–vis 2550
Shimadzu
Used to obtain UV–vis absorption spectra of the samples.
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Microwave reactor
Discover SP 909155
Matthews
Used for the microwave-assisted synthesis of TiO2-x and Ag/TiO2-x composites.
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X-ray photoelectron spectroscopy
VG Escalab 220i-XL
VG
Used to analyze the chemical composition of the catalysts.
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BET surface area analyzer
ASAP 2020HD 88
Micromeritics
Used to analyze the pore size distribution and BET surface area of the samples.
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