研究目的
To increase power output of PBFC through improvement of the photo-biocathode performance by modifying the biocathode with graphene oxide/cobalt/polypyrrole (GO/Co/PPy) composite in the presence of oxytetracycline, and to investigate the effects of GO/PPy/Co composite and oxytetracycline addition on microbial activities and mechanisms for enhancing performance.
研究成果
The GO/Co/PPy composite modified electrode significantly enhances PBFC performance by improving catalytic activity and reducing charge transfer resistance. OTC addition further increases power output at low concentrations due to mediator effects, but high concentrations inhibit microbial activity. This approach shows potential for energy harvesting from antibiotic-containing wastewater.
研究不足
The study is limited to specific conditions such as the use of Chlorella vulgaris and certain OTC concentrations. Performance may vary with different microorganisms or antibiotic types. High OTC concentrations (>10 mg/L) negatively affect algal growth, limiting applicability.
1：Experimental Design and Method Selection:
The study used a one-step electropolymerization method to fabricate GO/Co/PPy composite modified electrodes for use as biocathodes in PBFCs. Electrochemical methods such as CV and EIS were employed to evaluate performance.
2：Sample Selection and Data Sources:
Graphite felt electrodes were used as substrates. Anaerobic sludge and Chlorella vulgaris were used to inoculate the anode and cathode chambers. Oxytetracycline (OTC) was added at concentrations of 5, 10, 20, and 50 mg/L.
3：List of Experimental Equipment and Materials:
Equipment includes electrochemical workstation (CHI660E), SEM (XL-30), Raman spectrometer (Via Reflex), XPS (Thermo-VG Scientific), data acquisition system (Model 2700), UV/vis spectrophotometer (Shimadzu). Materials include graphite felt, GO, pyrrole, Co(NO3)2, OTC, PBS, nutrients.
4：Experimental Procedures and Operational Workflow:
Electrodes were modified via electropolymerization. PBFCs were constructed with anode and cathode chambers separated by a cation exchange membrane. They were operated under light/dark cycles with voltage and power measurements taken. Microbial community analysis was conducted via high-throughput sequencing.
5：Data Analysis Methods:
Data were analyzed using CV, EIS, and statistical methods for microbial community data. Power and current were normalized to cathode surface area.
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Data Acquisition System
Model 2700
Keithly Instruments
Used to measure voltage output across the resistor in the PBFC.
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Electrochemical Workstation
CHI660E
Shanghai CH Instrument Company
Used for conducting cyclic voltammetry and electrochemical impedance spectroscopy to evaluate electrode performance.
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Scanning Electron Microscope
XL-30
Philips
Used to characterize the morphologies of the electrodes and biofilms.
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Raman Spectrometer
Via Reflex
Renishaw plc
Used for Raman measurements to verify the presence of GO, PPy, and Co on electrode surfaces.
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X-ray Photoelectron Spectrometer
Thermo-VG Scientific Co.
Used to study the electronic states of cobalt on the electrode surface.
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UV/vis Spectrophotometer
Shimadzu Corporation
Used to measure optical density for algal growth assessment.
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Light Emitting Diode
20W
Used as a light source for cathode illumination in the PBFC.
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Graphite Felt
Used as the substrate electrode for modifications and as the cathode and anode material in the PBFC.
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Saturated Calomel Electrode
SCE
Used as a reference electrode in electrochemical measurements.
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Platinum Foil
Used as a counter electrode in electrochemical cells.
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Glassy Carbon Electrode
Used as a working electrode in CV measurements for detecting redox mediators.
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Cation Exchange Membrane
Used to separate the anode and cathode chambers in the PBFC.
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