研究目的
To fabricate magnetically recoverable PEI/titanate@Fe3O4 photocatalysts and investigate their photocatalytic properties for the degradation of organic pollutants like methylene blue under visible light irradiation.
研究成果
The PTF nanocomposites exhibit enhanced photocatalytic activity and excellent magnetic recoverability, making them promising for environmental remediation. The improved performance is due to increased surface area, mesoporosity, and electronic coupling between components. Future work could explore applications with diverse pollutants and scale-up processes.
研究不足
The study is limited to laboratory-scale experiments with methylene blue as the model pollutant; scalability to industrial applications and performance with other pollutants are not addressed. The magnetic separation efficiency and long-term stability beyond three cycles may require further optimization.
1：Experimental Design and Method Selection:
A hydrothermal deposition method was used to fabricate the ternary nanocomposites, involving the preparation of PEI-modified titanate (PMT), Fe3O4 microspheres, and their assembly via electrostatic attraction. Characterization techniques included FT-IR, XRD, TEM, UV-Vis DRS, TG-DSC, and N2 adsorption-desorption isotherms to analyze structure, morphology, thermal properties, and surface area. Photocatalytic activity was tested by degrading methylene blue under visible light.
2：Sample Selection and Data Sources:
Samples included pure Fe3O4 and PTF nanocomposites with different molar ratios (PTF-1, PTF-2, PTF-5). Methylene blue dye was used as the pollutant model.
3：5). Methylene blue dye was used as the pollutant model. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a Nicolet 470 FT-IR spectrophotometer, Rigaku Smart Lab 3 kW diffractometer, FEI Talos F200S TEM, Shimadzu DTG-60H thermal analyzer, Nova 1200e surface area analyzer, Shimadzu UV-2550 spectrophotometer, 300 W Xe arc lamp with 420 nm cutoff filter, and UV1800 UV-Vis spectrophotometer. Materials included analytical-grade reagents like FeCl3, NaOAc, polyethylene glycol, Cs2CO3, TiO2, HCl, TBA, PEI, and methylene blue.
4：Experimental Procedures and Operational Workflow:
PMT was prepared by exfoliating titanate sheets and modifying with PEI. Fe3O4 microspheres were synthesized via a solvothermal method. PTF nanocomposites were assembled by mixing Fe3O4 suspensions with PMT solution at different ratios, adjusting pH to 4, stirring, and drying. Photocatalytic tests involved dispersing catalyst in MB solution, stirring in dark for adsorption equilibrium, irradiating with visible light, sampling at intervals, filtering, and measuring absorbance.
5：Data Analysis Methods:
Data were analyzed using first-order kinetics for degradation rates, BET method for surface area, BJH method for pore size distribution, and Kubelka-Munk function for band gap estimation.
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X-ray diffractometer
Rigaku Smart Lab 3 kW
Rigaku
Collection of powder X-ray diffraction patterns
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Transmission electron microscope
FEI Talos F200S
FEI
High-resolution imaging and elemental analysis via EDS
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Thermal analyzer
Shimadzu DTG-60H
Shimadzu
Simultaneous TG-DTA measurements
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UV-Vis spectrophotometer
Shimadzu UV-2550
Shimadzu
Recording UV-Vis diffuse reflectance spectra
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FT-IR spectrophotometer
Nicolet 470
Nicolet
Characterization of infrared spectra for material analysis
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Surface area analyzer
Nova 1200e
Nova
Specific surface area and porosity measurements
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Xe arc lamp
300 W with 420 nm cutoff filter
Visible-light source for photocatalytic experiments
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UV-Vis spectrophotometer
UV1800
Measuring absorbance for concentration determination
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Membrane filter
0.22 μm Milipore mixed cellulose esters
Milipore
Filtration to remove catalyst particles
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