研究目的
To construct flower-like BiOCl/BiOCOOH p-n heterojunctions using an in situ anion exchange strategy for efficiently photocatalytic removal of aqueous toxic pollutants under solar irradiation.
研究成果
The in situ anion-exchange strategy successfully fabricated flower-like BiOCl/BiOCOOH p-n heterojunctions with enhanced photocatalytic activity due to improved charge separation and transfer. The S3 sample showed the highest efficiency, degrading MO and TC effectively under simulated sunlight, with good stability and recyclability. This approach offers a novel photocatalyst for wastewater treatment.
研究不足
The study is limited to laboratory-scale experiments under simulated sunlight; real-world application with natural sunlight and varying environmental conditions may require further optimization. The synthesis involves specific temperatures and chemicals, which might not be scalable or cost-effective for industrial use.
1：Experimental Design and Method Selection:
An in situ anion-exchange method was used to synthesize BiOCl/BiOCOOH heterojunctions, involving solvothermal synthesis of BiOCOOH and subsequent ion exchange with KCl at 70°C.
2：Sample Selection and Data Sources:
BiOCOOH microflowers were synthesized from Bi(NO3)3·5H2O, glycerol, DMF, and water; BiOCl/BiOCOOH heterojunctions were prepared by treating BiOCOOH with varying amounts of KCl.
3：List of Experimental Equipment and Materials:
Chemicals included Bi(NO3)3·5H2O, glycerol, DMF, KCl, MO, TC, AO, IPA, BQ from Sinopharm Chemical Reagent; equipment included autoclave, electric oven, XRD diffractometer (Bruker D8 Advance), SEM (Hitachi Se4800), TEM (JEM-2010F), UV-Vis spectrophotometer (Shimadzu UV-2600), PL spectrophotometer (Hitachi F-7000), Xe lamp (Beijing NBET Technology, HSX-UV300), magnetic stirrer, TOC analyzer (Vario TOC).
4：Experimental Procedures and Operational Workflow:
BiOCOOH was synthesized solvothermally at 160°C for 24h; BiOCl/BiOCOOH was formed by stirring BiOCOOH with KCl at 70°C for 5h; photocatalytic tests involved dispersing catalysts in MO or TC solutions under Xe lamp irradiation, with samples collected periodically for UV-Vis analysis; radical scavenging tests used IPA, BQ, and AO; PL and other characterizations were performed as described.
5：Data Analysis Methods:
XRD for phase identification, SEM/TEM for morphology, UV-Vis DRS for optical properties, PL for charge separation, pseudo-first-order kinetics for degradation rates, TOC for mineralization.
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Transmission electron microscope
JEM-2010F
JEOL
Investigating the morphologies and compositions of the samples, including elemental mappings.
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UV-Vis spectrophotometer
UV-2600
Shimadzu
Obtaining UV-Vis absorption spectra of the samples and analyzing pollutant concentrations.
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Fluorescence spectrophotometer
F-7000
Hitachi
Studying photoluminescence properties to analyze charge separation.
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X-ray diffractometer
D8 Advance
Bruker
Conducting X-ray powder diffraction for phase identification of samples.
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Scanning electron microscope
Se4800
Hitachi
Characterizing the morphology and structure of the samples.
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Xe lamp
HSX-UV300
Beijing NBET Technology
Providing simulated sunlight for photocatalytic tests.
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TOC analyzer
Vario TOC
Elementar
Measuring total organic carbon for mineralization assessment.
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Autoclave
Used for solvothermal synthesis of BiOCOOH at high temperature and pressure.
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Electric oven
Drying samples and maintaining temperature during synthesis.
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Magnetic stirrer
Stirring solutions during synthesis and photocatalytic tests.
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