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Molecules 2018, 23(4), 743;

Potential of Cellulose Functionalized with Carboxylic Acid as Biosorbent for the Removal of Cationic Dyes in Aqueous Solution

Açailândia Campus, Federal Institute of Maranhão, IFMA, Açailândia, MA 65930-000, Brazil
Teresina-Central Campus, Federal Institute of Piauí, IFPI, Teresina, PI 64000-040, Brazil
Interdisciplinary Laboratory for Advanced Materials—LIMAV, UFPI, Teresina, PI 64049-550, Brazil
Author to whom correspondence should be addressed.
Academic Editor: Janet L. Scott
Received: 27 February 2018 / Revised: 16 March 2018 / Accepted: 21 March 2018 / Published: 23 March 2018
(This article belongs to the Special Issue Cellulose Chemical Modifications—Towards Sustainable Materials)
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In the last decade, adsorption has been used to minimize the pollution caused by dyes, which represents a serious environmental problem. In this context, this work reports the preparation of phthalic anhydride-modified cellulose (PhCel), through the reaction of cellulose (Cel) with phthalic anhydride (Ph). The efficiency of the reaction was observed by elemental analysis, Fourier Transform Infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and thermogravimetry/derivative thermogravimetry (TG/DTG). The adsorbent matrix (Cel and PhCel) was used in the removal of crystal violet (CV) and methylene blue (MB) dyes in aqueous medium. In the kinetic study, the experimental data obtained had the best fit to the pseudo-first-order model. In general, the isotherms obtained at different temperatures had a best fit to the model proposed by Langmuir, and the CV and MB adsorption process in adsorbent matrixes can be favored strictly by hydrogen bonds and/or electrostatic interactions for Cel and electrostatic interactions for PhCel. View Full-Text
Keywords: cellulose; modification; description; adsorption; cationic dye cellulose; modification; description; adsorption; cationic dye

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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dos Santos Silva, L.; de Oliveira Carvalho, J.; de Sousa Bezerra, R.D.; da Silva, M.S.; Ferreira, F.J.L.; Osajima, J.A.; da Silva Filho, E.C. Potential of Cellulose Functionalized with Carboxylic Acid as Biosorbent for the Removal of Cationic Dyes in Aqueous Solution. Molecules 2018, 23, 743.

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