The effects of prolonged UV irradiation on the physicochemical characteristics of chitosan lamellar films modified with
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The effects of prolonged UV irradiation on the physicochemical characteristics of chitosan lamellar films modified with nanoparticulate silver vanadate nanorods A. M. Abdelghany1 · D. M. Ayaad2 · A. M. Aboelkheir2 Received: 15 June 2019 / Revised: 23 October 2019 / Accepted: 20 November 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract Chitosan–AgVO3 nanocomposites were synthesized via ordinary solution casting route at ambient room temperature. During UV prolonged irradiation, the structural and chemical changes were investigated using UV–Vis spectroscopy, Fourier transform infrared (FTIR) and X-ray diffraction analysis (XRD). Spectroscopic exploration of FTIR and UV–Vis indicated the photodegradation processes of prepared thin films. UV–Vis analysis confirmed the generation of new chromophoric groups after prolonged UV irradiation of synthesized lamellar nanocomposites polymer system probably assigned to photooxidation processes. The level of changes of such physicochemical characteristics may be considered to be dependent on the reactive functional groups on the chitosan surface, concentrations of inorganic lamellar dopant (AgVO3 nanorods), irradiation conditions and the time of UV irradiation. Primarily, this study provides the influential modification of chitosan with AgVO3 nanorods. Keywords Chitosan · Silver vanadate · Composites · Photodegradation · UV irradiation · Photooxidation
Introduction With the advent of nanotechnology, semiconductor nanomaterials have been used because of their novel mechanical, optical and electrical properties. Silver-based materials with various properties have attracted much interest in developing them in different fields such as C O2 reduction, bacteria disinfection, water splitting, H 2 evolution, * A. M. Abdelghany [email protected] 1
Physics Division, Spectroscopy Department, National Research Center, 33 Elbehouth St, Dokki, Giza 12311, Egypt
2
Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
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Polymer Bulletin
sensors and photocatalysis [1]. The exceptional improvement of silver-based composites may be assigned to the filled d10 configuration of the silver ions that includes hybridization and formation of such energy band structure [2]. Therefore, a set of silverbased materials was displayed. In particular, silver vanadate (β-AgVO3) has attracted researchers due to its narrow band gap, active in UV and visible light, have different phases (α and β-AgVO3) and simple preparation with various methods [3–5]. Chitin is extracted from a variety of natural biosystems, involving exoskeleton of crustaceans, fungal cell walls, crabs, insects and squid pens [6]. Chitosan is obtained by the alkaline treatment of chitin. Chitosan and its derivatives have been greatly used in food processing, medicines, wastewater treatment, agriculture and cosmetics due to their biocompatibility, hydrophilic nature, antimicrobial ability, biodegradability, nontoxicity and chelating abilities
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