研究目的
Investigating the photovoltammetric behavior of chloramphenicol (CAP) using a BiOI and graphene nanocomposite-based photocathode for developing a sensitive sensor.
研究成果
The BiOI-G electrode enables sensitive and selective detection of CAP with a low detection limit, good reproducibility, and stability, demonstrating its potential for real-sample applications in pharmaceutical and environmental monitoring.
研究不足
The sensor's performance may be affected by interfering substances like p-nitrophenol, and the shape of the photovoltammogram changes with CAP concentration, scan rate, and graphene content, requiring optimization. The method is specific to electroactive compounds and may not be universal.
1：Experimental Design and Method Selection:
The study involved preparing BiOI nanosheets via a chemical bath method and graphene suspensions, then mixing them to form BiOI-G composites. These were used to modify a glassy carbon electrode (GCE) for photovoltammetric measurements under visible light irradiation to study CAP reduction.
2：Sample Selection and Data Sources:
CAP and other chemicals were obtained from commercial suppliers. Real samples included eye drops and environmental water from a lake in Wuhan City.
3：List of Experimental Equipment and Materials:
Equipment included SEM (Nova NanoSEM 450), TEM (JEM-2100F), XPS (PerkinElmer PHI 5300 ESCA), electrochemical workstations (CHI830C and CHI660A), xenon lamp (CEL-S500/350), and HPLC (Agilent 1100). Materials included Bi(NO3)3·5H2O, KI, graphene, chitosan, and CAP.
4：0). Materials included Bi(NO3)3·5H2O, KI, graphene, chitosan, and CAP. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: BiOI was synthesized, mixed with graphene, and used to coat GCE. CV and photovoltammetric measurements were performed in a three-electrode system with SCE reference and Pt auxiliary electrode under light irradiation (λ > 420 nm). Data were analyzed for CAP detection.
5：Data Analysis Methods:
Electrochemical data were analyzed using impedance spectroscopy, CV curves, and linear regression for calibration. Statistical methods included RSD for reproducibility and recovery tests.
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Scanning Electron Microscope
Nova NanoSEM 450
FEI
Characterization of material morphology
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Energy Dispersive Spectroscopy
IE250X-Max50
Oxford
Elemental analysis
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Transmission Electron Microscope
JEM-2100F
JEOL
High-resolution imaging of materials
-
X-ray Photoelectron Spectrometer
5300 ESCA
PerkinElmer PHI
Surface chemical analysis
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High-Performance Liquid Chromatography System
Agilent 1100
Agilent
Chromatographic analysis for comparison
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Electrochemical Workstation
CHI830C
Shanghai Chenhua Instrument Company
Electrochemical measurements including CV and PEC
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Electrochemical Workstation
CHI660A
Shanghai Chenhua Instrument Company
Electrochemical impedance spectroscopy
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Xenon Lamp
CEL-S500/350
CEAULIGHT
Visible light irradiation source
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Glassy Carbon Electrode
Working electrode for electrochemical measurements
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Saturated Calomel Electrode
Reference electrode
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Platinum Wire
Auxiliary electrode
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