In situ preparation of film and hydrogel bio-nanocomposites of chitosan/fluorescein-copper with catalytic activity. (15th January 2018)

• Record Type: Journal Article
• Authors: Saldías, César; Díaz, David Díaz; Bonardd, Sebastián; Soto-Marfull, Cristián; Cordoba, Alexander; Saldías, Soledad; Quezada, Caterina; Radic, Deodato; Leiva, Ángel
• Is Part Of: Carbohydrate polymers. Volume 180(2018)
• Page Start: 200
• Page End: 208
• Publication Date: 2018-01-15
• Subjects: Chitosan -- Bionancomposites -- Copper nanoparticles -- Catalysis; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2017.10.018
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Chitosan/fluorescein (Ch/f) film and hydrogel nanocomposites were prepared by direct reaction with Cu2+ ions. The catalytic activity and order of reaction of the MB-N2H4 reduction system depended on the type of nanocomposite used. These matrices can offer an enabled medium for a diverse range of reactions. Ch/f bionanocomposites can be used for the synthesis and stabilization of copper nanoparticles. These systems based on relatively economically viable raw materials are attractive for industrial applications e.g., catalysis. Abstract: Copper nanoparticles were introduced into chitosan/fluorescein (Ch/f) film and hydrogel matrices by immersion of the respective matrix into an aqueous solution containing the precursor metallic salt and further reduction in aqueous medium at 75 °C for 3 h under nitrogen (N2 ) atmosphere. TGA was used to estimate the metallic content of Ch/f-Cu film and hydrogel nanocomposites. The prepared nanocomposites were proven to be effective as catalytic materials in the reduction of methylene blue (MB) employing N2 H4 as reducing agent. In addition, rate constants of the reduction reaction using Ch/f-Cu film and hydrogel nanocomposites as catalysts were determined. The experimental results showed that the catalytic activity and order of reaction of the MB-N2 H4 reduction system depended strongly on the type of nanocomposite used. Finally, the recyclability of the film and hydrogel nanocomposites as catalytic materials was also studied.