研究目的
To develop a facile two-step synthetic strategy for fabricating ternary polystyrene/reduced graphene oxide/ceria (PS/RGO@CeO2) nanocomposite particles and investigate their photocatalytic performance in degrading methylene blue.
研究成果
The PS/RGO@CeO2 nanocomposite particles exhibit high photocatalytic activity and stability for MB degradation due to synergistic effects between CeO2 NPs and RGO, with easy recovery via centrifugation. This strategy offers a new methodology for designing stable, high-performance photocatalysts for environmental applications.
研究不足
The study focuses on methylene blue degradation; applicability to other pollutants not tested. The synthesis and photocatalytic conditions may not be optimized for industrial scale-up. Potential aggregation issues with graphene-based materials in other solvents or conditions not fully addressed.
1：Experimental Design and Method Selection:
A two-step synthesis involving self-assembly of reduced graphene oxide (RGO) on polystyrene (PS) microspheres followed by attachment of ceria (CeO2) nanoparticles. Methods include dispersion polymerization, Hummers method for graphite oxide, and in situ growth using cerium nitrate and hexamethylene tetramine.
2：Sample Selection and Data Sources:
PS microspheres synthesized via dispersion polymerization, graphite oxide prepared by modified Hummers method, and methylene blue as the pollutant model.
3：List of Experimental Equipment and Materials:
Materials include styrene, azodiisobutyronitrile, graphite, potassium peroxydisulfate, phosphorus pentoxide, sulfuric acid, potassium hydroxide, potassium permanganate, ethanol, isopropanol, hydrochloric acid, hydrogen peroxide, poly(vinylpyrrolidone), hydrazine hydrate, cerium(III) nitrate hexahydrate, hexamethylene tetramine, methylene blue. Equipment includes ultrasonic bath, centrifuge, fluorescent lamp (45 W), SEM (Hitachi S-4800), EDX, XRD (Bruker-AXS D8 Advance), XPS (VG ESCALABMKII), TGA (PerkinElmer Pyris 1), UV-vis spectrometer (Puxi TU-1901).
4：1).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: PS microspheres synthesized and coated with RGO via reduction with hydrazine hydrate. CeO2 NPs attached by reacting Ce(NO3)3 with HMT in presence of PS/RGO. Photocatalytic degradation of MB performed under fluorescent lamp irradiation, with samples taken periodically for UV-vis analysis.
5：Data Analysis Methods:
UV-vis spectroscopy to monitor MB degradation at 664 nm, pseudo-first-order kinetics analysis, TGA for mass loading determination, SEM/EDX/XRD/XPS for morphological and compositional characterization.
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