A comprehensive investigation of dye–chitosan blended films for green chemistry applications

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...

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Published inJournal of applied polymer science Vol. 135; no. 10
Main Authors Rizzi, Vito, Longo, Alessandra, Placido, Tiziana, Fini, Paola, Gubitosa, Jennifer, Sibillano, Teresa, Giannini, Cinzia, Semeraro, Paola, Franco, Esther, Ferrandiz, Marcela, Cosma, Pinalysa
Format Journal Article
LanguageEnglish
Published Hoboken Wiley Subscription Services, Inc 10.03.2018
Subjects
adsorption
biomaterials
Chemical bonds
Chitosan
Dyeing
Dyes
Hydrogen bonds
Materials science
Polymers
polysaccharides
separation techniques
Swelling ratio
Textiles
Van der Waals forces
Wastewater treatment
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Summary: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.
Bibliography:Dr. Vito Rizzi performed the FTIR‐ATR experiments. Dr. Alessandra Longo and Dr. Paola Semeraro performed the UV–vis experiments. Dr. Tiziana Placido performed the AFM experiments. Dr. Paola Fini performed the swelling ratio measurements. Dr. Jennifer Gubitosa performed experiments related to chitosan film formation and use. Dr. Teresa Sibillano and Dr. Cinzia Giannini performed the XRD experiments. Dr. Esther Franco and Dr. Marcela Ferrandiz performed dyeing capacity experiments of dye–chitosan blended films. Professor Pinalysa Cosma supervised the research and with Dr. Vito Rizzi wrote the manuscript.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.45945