研究目的
Investigating the synergistic effect of defects and metal-free doping in ultrathin two-dimensional materials for environmental remediation, specifically the degradation of colorless organic contaminants under visible light irradiation.
研究成果
The oxygen vacancy-rich ultrathin sulfur-doped BiOBr nanosheets (BB-xS) exhibit superior photocatalytic activity for the degradation of colorless organic contaminants under visible light, attributed to the synergistic effect of sulfur doping and oxygen vacancies. This work provides a new approach for designing highly active photocatalysts for environmental remediation.
研究不足
The study focuses on the degradation of specific colorless organic contaminants and may not cover all types of pollutants. The scalability and practical application in real-world environmental remediation need further investigation.
1：Experimental Design and Method Selection:
A one-step solvothermal method was used to synthesize oxygen vacancy-rich ultrathin sulfur-doped BiOBr nanosheets (BB-xS).
2：Sample Selection and Data Sources:
4-chlorophenol (4-CP) was selected as a probe contaminant due to its lack of visible light absorption and presence in wastewater.
3：List of Experimental Equipment and Materials:
Bismuth nitrate pentahydrate, sodium bromide, thiourea, polyvinylpyrrolidone (PVP, K-30), glycerol, and other chemicals were used.
4：Experimental Procedures and Operational Workflow:
The synthesis involved dispersing Bi(NO3)3?5H2O and PVP in a mixture of water and glycerol, adding NaBr and thiourea solutions, and heating in a Teflon-lined autoclave.
5：Data Analysis Methods:
The photocatalytic activity was evaluated by degradation efficiency of 4-CP under visible light irradiation, analyzed using UPLC-MS for intermediates and ESR for active radicals.
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X-ray diffractometer
Bruker D8
Bruker
Phase and crystallinity determination
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SEM
Quanta 200FEG
FEI
Morphology and microstructure study
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TEM
FEI Tecnai G2 F30
FEI
Morphology and microstructure study
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TOC measuring instrument
Shimadz TOC-5000
Shimadzu
Analysis of total organic carbon concentrations
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X-ray photoelectron spectroscopy
Thermo ESCALAB 250
Thermo
Chemical composition analysis
-
ESR spectroscopy
Bruker A300 spectrometer
Bruker
Investigation of oxygen vacancies and reactive radicals
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UV–vis diffuse reflectance spectra
UV2550
Shimadzu
Optical properties evaluation
-
Photoluminescence spectra
F-4600
Hitachi
Study of photoexcited charge transfer behaviors
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Short-arc xenon lamp
PE300BF
Perkin-Elmer
Light source for photocatalytic activity measurement
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Bismuth nitrate pentahydrate
Bi(NO3)3?5H2O
Sinopharm Chemical Reagent Co. Ltd
Precursor for synthesizing BiOBr nanosheets
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Sodium bromide
NaBr
Sinopharm Chemical Reagent Co. Ltd
Source of bromine for BiOBr synthesis
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Thiourea
Sinopharm Chemical Reagent Co. Ltd
Sulfur source for doping
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Polyvinylpyrrolidone
PVP, K-30
Sinopharm Chemical Reagent Co. Ltd
Stabilizer in the synthesis process
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Glycerol
Sinopharm Chemical Reagent Co. Ltd
Solvent in the synthesis process
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4-chlorophenol
4-CP
Sinopharm Chemical Reagent Co. Ltd
Probe contaminant for photocatalytic degradation
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5,5-dimethyl-1-pyrroline N-oxide
DMPO
Sinopharm Chemical Reagent Co. Ltd
Spin trap for ESR spectroscopy
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Bisphenol A
BPA
Sinopharm Chemical Reagent Co. Ltd
Colorless organic contaminant for degradation
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Sulfadiazine
SDZ
Sinopharm Chemical Reagent Co. Ltd
Colorless organic contaminant for degradation
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Sulfamerazine
SMZ
Sinopharm Chemical Reagent Co. Ltd
Colorless organic contaminant for degradation
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Methanol
Sinopharm Chemical Reagent Co. Ltd
Solvent
-
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