研究目的
Investigating the synthesis and photocatalytic performance of a cauliflower-like AgBr/Ag3PO4/sulfonated polystyrene sphere heterojunction photocatalyst for the degradation of rhodamine B in water under visible light irradiation.
研究成果
The cauliflower-like AgBr/Ag3PO4/SPS heterojunction photocatalyst was successfully synthesized via in situ ion exchange, exhibiting excellent photocatalytic activity and stability for RhB degradation under visible light. The heterogeneous junction between AgBr and Ag3PO4 facilitates charge separation, enhancing performance. This approach also enables the reuse of silver ions from wastewater, reducing costs and environmental impact. Future studies could explore applications to other pollutants and scale-up processes.
研究不足
The specific surface area of the AgBr/Ag3PO4/SPS photocatalyst (1.01 m2/g) is lower than that of pure SPS (11.98 m2/g), which may limit adsorption capacity. The study focuses on RhB degradation and may not generalize to other pollutants. Experiments were conducted under controlled laboratory conditions, and scalability to industrial applications is not addressed.
1：Experimental Design and Method Selection:
The study employed an in situ ion exchange method to synthesize the photocatalyst using wastewater containing silver ions and sulfonated polystyrene spheres (SPS). Hydrothermal synthesis was used for preparation.
2：Sample Selection and Data Sources:
Raw materials included silver ion-containing wastewater and SPS. Rhodamine B (RhB) was used as the target pollutant for photocatalytic performance testing.
3：List of Experimental Equipment and Materials:
Equipment included a four-mouth flask, mechanical stirrer, centrifuge, drying oven, FE-SEM (Hitachi S-4800), UV–Vis DRS (TU-1901 UV–Vis spectrophotometer), XRD (Bruker D8, Cu-Kα), EDS (HORIBA EX-350), BET surface area analyzer (Quantachrome Autosorb-iQ), and DR2800 water quality analyzer (HACH). Materials included styrene, polyvinyl pyrrolidone (PVP), 2,2-azobis(2-methylpropionitrile) (AIBN), ethanol, concentrated sulfuric acid, AgNO3, Na2HPO4, NaBr, and other reagents from specified suppliers.
4：Experimental Procedures and Operational Workflow:
SPS was synthesized via polymerization and sulfonation. The photocatalyst was prepared by ion exchange with AgNO3, followed by addition of Na2HPO4 and NaBr solutions under stirring in dark conditions. Characterization involved SEM, XRD, UV–Vis DRS, EDS, and BET analysis. Photocatalytic activity was tested by degrading RhB under visible light, with adsorption-desorption equilibrium established in the dark.
5：Data Analysis Methods:
Data from characterization techniques were analyzed to determine crystal structure, optical properties, morphology, and elemental composition. Photocatalytic degradation rates were measured using a water quality analyzer, and stability was assessed through cyclic tests.
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