研究目的
To improve the efficiency of electron-hole separation in covalent organic frameworks (COFs) by incorporating plasmonic Au nanocrystals (NCs) with precisely modulated distributions, and to understand how spatial distributions of NCs in COFs affect photocatalytic performances.
研究成果
The incorporation of plasmonic Au NCs into COFs with precisely modulated distributions significantly improves the photocatalytic performance by enhancing electron-hole separation and optimizing charge-carrier utilization. The spatial distribution of NCs within COFs plays a critical role in determining the photocatalytic activity and selectivity.
研究不足
The study focuses on the spatial distribution of Au NCs within COFs and its effect on photocatalytic performance, but does not extensively explore other factors such as different types of NCs or COFs structures that might also influence the photocatalytic efficiency.
1：Experimental Design and Method Selection:
The study involved the synthesis of Au NCs and their incorporation into COFs with controlled spatial distributions. The photocatalytic performances were evaluated through degradation of RhB and dehalogenation of phenacyl bromide under visible light irradiation.
2：Sample Selection and Data Sources:
Au NCs were synthesized and incorporated into COFs. The photocatalytic activities were measured using UV-Vis spectroscopy and GC-MS.
3：List of Experimental Equipment and Materials:
TEM, SEM, FTIR, XRD, nitrogen sorption, TGA, XPS, PL, EPR, and electrochemical measurements were used.
4：Experimental Procedures and Operational Workflow:
The synthesis involved a two-step polymerization-crystallization process, followed by photocatalytic tests under controlled conditions.
5：Data Analysis Methods:
The data were analyzed using UV-Vis spectroscopy, GC-MS, and various spectroscopic techniques to understand the photocatalytic mechanisms.
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X-ray diffractometer
Bruker D8 DISCOVER
Bruker
Recording powder X-ray diffraction (PXRD)
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XPS system
ESCALAB 250 Xi
Thermo Scientific
Recording X-ray photoelectron spectroscopy (XPS) spectra
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EPR spectrometer
JEOL JES-FA200
JEOL
Recording EPR signals for π-cation radical detections
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EPR spectrometer
Bruker EMXmicro-6/1/P/L
Bruker
Recording EPR signals for hydroxyl radical detections
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TEM
JEM-2100
JEOL
Inspection of morphologies and microstructures of samples
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FE-SEM
ZEISS SUPRATM 55
ZEISS
Inspection of morphologies and microstructures of samples
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TGA instrument
METTLER TOLEDO TGA 2-SF
METTLER TOLEDO
Recording thermogravimetric analysis (TGA)
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Spectrofluorophotometer
FLS920 Pro
Recording time-resolved photoluminescence spectra
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UV-Vis spectrometer
Varian Cary 5000
Varian
Obtaining UV-Vis diffuse reflection absorption spectra
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Electrochemical workstation
CHI 760E
Shanghai, China
Performing electrochemical measurements
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Xe lamp
CEL-HXF300
Ceaulight, Beijing
Used as the visible light source for photocatalytic reactions
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Photoreactor
CEL-HPR 50
Ceaulight, Beijing
Monitoring the activity and selectivity of photocatalytic reactions
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GC-MS
Analyzing the products of photocatalytic reactions
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