研究目的
To synthesize and characterize a silver phosphate/sillenite bismuth ferrite/graphene oxide nanocomposite for enhanced visible light photocatalytic degradation of organic pollutants, specifically Rhodamine B.
研究成果
The Ag3PO4/Bi25FeO40/GO nanocomposite was successfully synthesized and exhibited high photocatalytic activity for Rhodamine B degradation under visible light, attributed to enhanced light absorption and charge separation. The main reactive species were ?O2?, e?, and h+. The nanocomposite is magnetic, aiding in separation, and the study provides insights for environmental applications.
研究不足
The study is limited to laboratory-scale experiments with specific conditions; scalability and real-world application may require further optimization. The magnetic properties of the nanocomposite are reduced after Ag3PO4 decoration, which could affect recyclability. The content of GO was low and not detectable by XRD, potentially limiting its role.
1：Experimental Design and Method Selection:
The nanocomposite was fabricated using a two-step method involving hydrothermal synthesis for Bi25FeO40/GO and ultrasonic precipitation for Ag3PO4/Bi25FeO40/GO. Characterization techniques included XRD, Raman, SEM, TEM, XPS, UV-vis DRS, BET, VSM, LSV, M-S, transient photocurrent, and EIS to study physicochemical and photoelectrochemical properties. Photocatalytic activity was evaluated by degrading Rhodamine B under visible light.
2：Sample Selection and Data Sources:
Samples included GO, Bi25FeO40/GO, and Ag3PO4/Bi25FeO40/GO nanocomposites. Rhodamine B was used as the model pollutant.
3：List of Experimental Equipment and Materials:
Equipment: JSM-6701F SEM, D/Max-2004 XRD, PHI-5700 XPS, Shimadzu UV-2550 spectrophotometer, Lab Ram-1B Raman spectrometer, Lake Shore 7303 VSM, CHI660E electrochemical workstation, Evolution-300 UV-Vis spectrophotometer. Materials: Graphite powder, bismuth nitrate pentahydrate, iron nitrate nonahydrate, silver nitrate, sodium dihydrogen phosphate, sulfuric acid, potassium hypermanganate, phosphorus pentoxide, hydrogen peroxide, p-benzoquinone, EDTA, tert-butyl alcohol, potassium dichromate, all analytical grade.
4：Experimental Procedures and Operational Workflow:
GO was prepared by modified Hummers method. Bi25FeO40/GO was synthesized hydrothermally at 433K for 24h. Ag3PO4/Bi25FeO40/GO was prepared by ultrasonic precipitation. Photocatalytic degradation involved stirring in dark for 30min, then illumination with a 35W Xenon lamp, sampling at intervals, and measuring absorbance at 553nm.
5：4h. Ag3PO4/Bi25FeO40/GO was prepared by ultrasonic precipitation. Photocatalytic degradation involved stirring in dark for 30min, then illumination with a 35W Xenon lamp, sampling at intervals, and measuring absorbance at 553nm. Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed using standard techniques for each characterization method; for example, band gap was calculated from UV-vis DRS using the equation (αhν)^2 vs. hν, and photoelectrochemical data were interpreted using Mott-Schottky plots and EIS.
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scanning electron microscope
JSM-6701F
JEOL
To detect the morphologies of the samples.
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X-ray powder diffractometer
D/Max-2004
Rigaku
To record XRD patterns with Cu Kα radiation.
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UV-visible spectrophotometer
UV-2550
Shimadzu
To record UV-vis DRS spectra.
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vibrating sample magnetometer
Lake Shore 7303
Lake Shore Cryotronics
To measure magnetization at room temperature.
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electrochemical workstation
CHI660E
CH Instruments
To measure photoelectrochemical properties.
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UV-Vis spectrophotometer
Evolution-300
Thermo Fisher Scientific
To analyze Rh B concentration at 553nm.
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X-ray photoelectron spectrometer
PHI-5700 ESCA
Physical Electronics
To measure XPS spectra.
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Raman spectrometer
Lab Ram-1B
Jobin Yvon
To perform Raman spectroscopy.
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Xenon lamp
35W
To provide visible light illumination for photocatalytic experiments.
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