研究目的
To investigate the role of reactive oxygen species and the influence of KBiO3 synthesis method in the photodegradation of methylene blue and ciprofloxacin.
研究成果
KBiO3 synthesized by different methods shows varied morphologies and photocatalytic activities. Sonochemical method is best for MB degradation (100% discoloration), hydrothermal for CPFX (67% degradation). H2O2 is the primary ROS for MB degradation, while O2?· is for CPFX. The catalyst is effective but only partially mineralizes pollutants, suggesting potential for improvement in future studies.
研究不足
The study is limited to specific synthesis methods and organic pollutants; generalization to other methods or pollutants may require further investigation. The mineralization degree is partial (37% for MB, 20% for CPFX), indicating incomplete degradation. The influence of crystal structure and organic molecule interactions needs more detailed studies.
1：Experimental Design and Method Selection:
KBiO3 was synthesized by three methods (chemical substitution, hydrothermal, sonochemical) to study its photocatalytic properties. Characterization included XRD, SEM, HR-TEM, UV-Vis spectroscopy, and BET surface area analysis. Photocatalytic experiments were conducted using a xenon lamp, with scavengers added to identify reactive oxygen species.
2：Sample Selection and Data Sources:
Samples were synthesized from NaBiO3 and KOH. Organic pollutants used were methylene blue (MB) and ciprofloxacin (CPFX).
3：List of Experimental Equipment and Materials:
Equipment includes Bruker Advanced X-ray Solutions D8, FEI Nova 200 NanoSEM, HRTEM FEI TECNAI F30, Cary 5000 UV-Vis NIR spectrophotometer, BELSORP Mini-II surface area analyzer, Perkin-Elmer Lambda 35 UV-Vis spectrophotometer, SHIMADZU TOC-VSCH analyzer, and sonicator SONICS VCX130. Materials include KOH, NaBiO3, benzoquinone, isopropanol, catalase, MB, CPFX.
4：Materials include KOH, NaBiO3, benzoquinone, isopropanol, catalase, MB, CPFX. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Synthesis involved specific conditions for each method (e.g., heating, sonication). Characterization steps: XRD for structure, SEM and TEM for morphology, UV-Vis for band gap, BET for surface area. Photocatalytic tests: dark adsorption for 1 h, irradiation with xenon lamp, aliquots taken every 30 min for 4 h, analysis by spectrophotometry. Scavenger tests with specific dosages. TOC analysis for mineralization.
5：Data Analysis Methods:
Band gap calculated using Eg = 1240/λg. Surface area by BET method. Photocatalytic degradation monitored by absorbance at specific wavelengths. Mineralization by TOC analysis.
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X-ray Diffractometer
D8
Bruker
Analyzing crystal structure of samples by X-ray powder diffraction
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Scanning Electron Microscope
Nova 200 NanoSEM
FEI
Observing morphology of KBiO3 powders
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Transmission Electron Microscope
TECNAI F30
FEI
Evaluating crystal structure and determining particle size, corroborating morphology
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UV-Vis NIR Spectrophotometer
Cary 5000
Agilent
Obtaining optical absorption spectra of samples, equipped with integrating sphere for band gap calculation
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UV-Vis Spectrophotometer
Lambda 35
Perkin-Elmer
Following photocatalytic reaction by measuring absorbance at specific wavelengths
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TOC Analyzer
TOC-VSCH
SHIMADZU
Measuring mineralization degree by total organic carbon analysis
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Surface Area Analyzer
BELSORP Mini-II
BEL Japan
Calculating specific surface area by N2 adsorption-desorption measurements using BET method
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Ultrasonic Processor
VCX130
SONICS
Sonicating samples during sonochemical synthesis
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Xenon Lamp
Used as a light source for photocatalytic experiments
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