研究目的
To design and develop new efficient methods/materials to degrade the dyes in aqueous solution for wastewater treatment.
研究成果
AgNPs@ZIF-8 composites, especially SZ2, exhibit enhanced photocatalytic efficiency for degradation of MB and CR, signifying their utility for wastewater treatment. The composites are thermally stable and can be stored for several months.
研究不足
The agglomeration of AgNPs due to increase in surface energy reduces their catalytic performance. The study focuses on MB and CR dyes, and the applicability to other pollutants is not explored.
1：Experimental Design and Method Selection
Facile synthesis of AgNPs@ZIF-8 via in situ generation of AgNPs and ZIF-8 was demonstrated. Composites with different Ag contents were characterized by PXRD, XPS, and FT-IR spectroscopy.
2：Sample Selection and Data Sources
Methylene blue (MB) and congo red (CR) were used as organic pollutants. The photocatalytic performance was studied under UV–vis light irradiation.
3：List of Experimental Equipment and Materials
Anhydrous zinc chloride, silver nitrate, 2-methylimidazole, methylene blue, congo red, sodium borohydride, trisodium citrate dihydrate.
4：Experimental Procedures and Operational Workflow
AgNPs@ZIF-8 composite was synthesized by two methods: addition of pre-synthesized ZIF-8 in situ synthesis of AgNPs and encapsulation of pre-synthesized AgNPs in situ synthesis of ZIF-8. Photocatalytic degradation studies were conducted under UV–vis irradiations.
5：Data Analysis Methods
The remaining concentration of dyes was calculated at λmax 663 nm for MB and at 497 nm for CR. %photodegradation and adsorption capacity were estimated using specific equations.
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