A comprehensive investigation of dye–chitosan blended films for green chemistry applications |
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| Authors: | Vito Rizzi Alessandra Longo Tiziana Placido Paola Fini Jennifer Gubitosa Teresa Sibillano Cinzia Giannini Paola Semeraro Esther Franco Marcela Ferrandiz Pinalysa Cosma |
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| Affiliation: | 1. Università degli Studi “Aldo Moro” di Bari, Dip. Chimica, Via Orabona, Bari, Italy;2. Consiglio Nazionale delle Ricerche CNR‐IPCF, UOS Bari, Via Orabona, Bari, Italy;3. Dipartimento di Farmacia‐Scienze del Farmaco, Unità di Tecnologia Farmaceutica, Università degli Studi di Bari “A. Moro,” via Orabona 4, Bari, Italy;4. Consiglio Nazionale delle Ricerche CNR‐IC, UOS Bari, Via Amendola,122/O, Bari, Italy;5. Biotechnology Department, Textile Industry Research Association (AITEX), Plaza Emilio Sala, Alcoy, Spain |
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| Abstract: | In this paper, the ability of chitosan film to remove dyestuff from wastewater was evaluated for environmental applications, using three commercial direct azo dyes. Two chitosan films were adopted: the standard one prepared following a well‐known procedure to form it, and a novel one, with a weakly acidic character. Moreover, to improve the adsorption process, the hydrophobic character of the films was investigated. The pH of the dye solutions was also changed, showing an excellent ability in dye removal at pH 12. The films were characterized by means of spectroscopic and morphologic methods to better understand the nature of interactions between dyes and chitosan chains. Swelling ratio measurements were also performed. All analyses suggest that all dyes showed a strong affinity to chitosan polymer chains, with the presence of extended hydrogen bonds and Van der Waals forces perturbing the chitosan network. Interestingly, very good results were obtained in recycling experiments related to the dyeing capacities of chitosan blended films in the presence of textiles. An ecofriendly application is thus presented in this paper. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45945. |
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| Keywords: | adsorption biomaterials polysaccharides separation techniques |
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