研究目的
Investigating the influence of metal loading and preparation method on the photocatalytic degradation of organic pollutants using Ag/ZnS nanoparticles.
研究成果
The study demonstrated that Ag/ZnS nanoparticles, especially at 0.1 wt% Ag loading prepared by chemical reduction, exhibit enhanced photocatalytic activity for the degradation of organic pollutants under UV irradiation. The presence of Ag on ZnS surface improves charge separation and extends the light absorption to the visible region, leading to higher degradation efficiency. The findings suggest potential applications in water and wastewater treatment.
研究不足
The study is limited to the photocatalytic degradation of MB and phenol under UV irradiation. The effects of other pollutants and under different light sources were not explored. Additionally, the scalability and practical application of the photocatalysts in real wastewater treatment were not addressed.
1：Experimental Design and Method Selection:
The study involved the preparation of Ag/ZnS photocatalysts through two methods: photodeposition and chemical reduction. The photocatalytic activity was evaluated using methylene blue (MB) and phenol as model pollutants under UV irradiation.
2：Sample Selection and Data Sources:
Commercial ZnS was used as the base material, and Ag was loaded at different weight percentages (0.05-4 wt%). The samples were characterized using various techniques to understand their physical and chemical properties.
3：05-4 wt%). The samples were characterized using various techniques to understand their physical and chemical properties.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a Costech Sorptometer for BET surface area measurements, a PHI Versaprobe II spectrometer for XPS, a Brucker D8 diffractometer for XRD, a Perkin Elmer spectrometer Lambda 35 for UV-vis DRS, and a Dispersive MicroRaman spectrometer (Invia, Renishaw) for Raman spectroscopy. Materials included ZnS, NaBH4, AgNO3, MB, and phenol.
4：Experimental Procedures and Operational Workflow:
The photocatalytic tests were conducted in a pyrex cylindrical photoreactor under UV light irradiation. The degradation of pollutants was monitored over time using UV-Vis spectrophotometry.
5：Data Analysis Methods:
The photocatalytic efficiency was evaluated based on the degradation percentage of MB and phenol. The physical and chemical properties of the photocatalysts were analyzed to correlate with their photocatalytic performance.
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