研究目的
To design and evaluate a novel dual-cathode PEC-EEC system for efficient degradation of pollutants, specifically tetracycline, by coupling photoelectrocatalysis with electroenzymatic catalysis to utilize electrons effectively for H2O2 production and enzymatic oxidation.
研究成果
The dual-cathode PEC-EEC system effectively degrades pollutants like RhB and TC with high efficiency (93.6% TC removal in 2 hours), demonstrating synergy between PEC and EEC. It shows promise for wastewater treatment applications due to its reusability and stability.
研究不足
The system may have limitations in scalability for industrial applications, potential stability issues over long-term use, and dependency on visible light and oxygen supply for optimal performance. Optimization of parameters like bias potential and catalyst loading could be further explored.
1：Experimental Design and Method Selection:
The study designed a dual-cathode system integrating photoelectrocatalysis (PEC) and electroenzymatic catalysis (EEC). BiVO4 photoanode was used for visible light-driven PEC, carbon cloth cathode for H2O2 electrogeneration, and hemin/Cu cathode for enzymatic catalysis.
2：Sample Selection and Data Sources:
Pollutants used were Rhodamine B (RhB) and tetracycline (TC) in aqueous solutions with Na2SO4 as supporting electrolyte.
3：List of Experimental Equipment and Materials:
Equipment includes SEM (Nova NanoSEM 450), XPS (5300 ESCA), XRD (Philips X'pert Pro), UV-vis spectrophotometer (UV-2550), FTIR (Equinox 55), electrochemical workstation (CHI 660A), xenon lamp (PLS-SXE300), HPLC (Agilent 1100), and LC-MS/MS (Agilent 1100 LC/MSD Trap). Materials include FTO glass, carbon cloth (HCP330P), hemin, tetracycline, RhB, and other chemicals.
4：Experimental Procedures and Operational Workflow:
Fabrication of BiVO4 photoanode by electrodeposition, hemin/Cu cathode by electrophoretic deposition. Degradation experiments conducted in a quartz photoreactor with visible light illumination, applied bias potential, and air purging for oxygen supply. Samples analyzed for H2O2 concentration, decoloration percentage, and TC degradation using spectrophotometry, HPLC, and LC-MS/MS.
5：Data Analysis Methods:
Data analyzed using standard deviation for error bars, UV-vis spectroscopy for absorbance, HPLC for concentration, and LC-MS/MS for intermediate identification with mass error calculations.
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SEM instrument
Nova NanoSEM 450
FEI
Used for morphology and elemental analysis of the BiVO4 film.
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EDS
IE250X-Max50
Oxford
Used for elemental analysis in conjunction with SEM.
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UV-vis spectrophotometer
UV-2550
Shimadzu
Used for diffuse reflectance spectra and absorbance measurements.
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FTIR spectrophotometer
Equinox 55
Bruker Co.
Used for Fourier transform infrared spectra measurements.
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HPLC
Agilent 1100
Agilent
Used for analysis of tetracycline concentration.
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LC-MS/MS
Agilent 1100 LC/MSD Trap
Agilent
Used for identification of transformation products during degradation.
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FTO conducting glass
Dalian Heptachroma SolarTech Co. Ltd.
Used as a substrate for the BiVO4 photoanode fabrication.
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Carbon cloth
HCP330P
Shanghai Hesen Electric Co., Ltd.
Served as the first cathode for electrogeneration of H2O2.
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Hemin
Kayon Biological Technology Co., Ltd.
Used as a peroxidase substitute in the enzymatic catalysis cathode.
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Tetracycline
Aladdin
Used as a pollutant for degradation experiments.
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Rhodamine B
Sinopharm Chemical Reagent Co. Ltd.
Used as a model pollutant for evaluating system performance.
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XPS instrument
5300 ESCA
Perkin-Elmer PHI Co.
Used for chemical composition and oxidation state analysis.
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XRD instrument
Philips X'pert Pro
PANanalytical B.V
Used for crystal phase identification.
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Electrochemical workstation
CHI 660A
Shanghai Chenhua Instrument Co.
Used for electrochemical measurements and control.
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Xenon lamp
PLS-SXE300
Perfect Co.
Used as a light source for visible light illumination in degradation experiments.
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UV-visible spectrometer
TU-1900
Beijing Purkinje General Instrument Company
Used for determination of H2O2 concentration and absorbance measurements.
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