研究目的
Investigating the photocatalytic degradation of Rhodamine B (RhB) dye under visible LED light irradiation using BiPO4/BiOBr heterojunction photocatalysts.
研究成果
The BiPO4/BiOBr heterojunction photocatalysts exhibit enhanced photocatalytic activity for RhB degradation under visible LED light irradiation, with the 30% BiPO4/BiOBr composite showing the highest efficiency. The improved performance is attributed to the heterojunction formation and efficient charge separation. The study suggests potential applications in wastewater purification for dye pollutants.
研究不足
The study focuses on the degradation of RhB under specific conditions and does not explore the degradation of other pollutants or under different light sources. The scalability and practical application of the method in real wastewater treatment scenarios are not addressed.
1：Experimental Design and Method Selection:
BiOBr was synthesized via alcoholysis precipitation method, and BiPO4/BiOBr composites were prepared by reacting BiOBr with H3PO4 at room temperature.
2：Sample Selection and Data Sources:
Different proportions of BiPO4/BiOBr composites were prepared by adjusting the volume of H3PO4 added to BiOBr.
3：List of Experimental Equipment and Materials:
Instruments included XRD, SEM, HRTEM, XPS, UV–vis absorption spectroscopy, and PL spectrometer. Materials included Bi(NO3)3·5H2O, KBr, H3PO4, and RhB.
4：Experimental Procedures and Operational Workflow:
The photocatalytic activity was evaluated by degrading RhB under visible LED light irradiation, with samples taken at intervals for analysis.
5：Data Analysis Methods:
The degradation efficiency was calculated from the RhB concentration before and after exposure to light, and the rate constants were determined from the plot of ln(C/C0) versus time.
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Field emission SEM
JSM-7610F
JEOL
Examining the morphologies of the catalysts.
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TEM
Tecnai G2 F20
FEI
Investigating the heterojunction structure between BiPO4 and BiOBr.
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XPS systems
K-Alpha
Thermo Fisher Scientific
Examining the composition and chemical states of the samples.
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UV–vis spectrometer
Lambda
PerkinElmer
Obtaining UV–vis DRS with BaSO4 as a reference.
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PL spectrometer
Fls 980
Edinburgh
Measuring the PL spectra with an excitation wavelength of 320 nm.
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X-ray powder diffractometer
X'Pert Panalytical
Phillips
Recording XRD patterns to investigate the crystal structure of the samples.
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