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A comprehensive investigation of dye–chitosan blended films for green chemistry applications
Author(s) -
Rizzi Vito,
Longo Alessandra,
Placido Tiziana,
Fini Paola,
Gubitosa Jennifer,
Sibillano Teresa,
Giannini Cinzia,
Semeraro Paola,
Franco Esther,
Ferrandiz Marcela,
Cosma Pinalysa
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.45945
Subject(s) - chitosan , adsorption , dyeing , polymer , van der waals force , hydrogen bond , chemical engineering , polymer chemistry , materials science , swelling , chemistry , polymer science , molecule , organic chemistry , composite material , engineering
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.