Potential of amino-functionalized cellulose as an alternative sorbent intended to remove anionic dyes from aqueous solutions

• Published in: International journal of biological macromolecules Vol. 116; pp. 1282 - 1295
• Main Authors: Silva, Lucinaldo S., Ferreira, Francisco J.L., Silva, Mateus S., Citó, Antônia M.G.L., Meneguin, Andréia B., Sábio, Rafael M., Barud, Hernane S., Bezerra, Roosevelt D.S., Osajima, Josy A., Silva Filho, Edson C.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-09-2018
• Subjects: Adsorption; Anionic dyes; Characterization; Modified cellulose; Characterization; Anionic dyes; Modified cellulose; Adsorption
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2018.05.034

Adsorption has been explored to minimize the pollution caused by dyes. This work relates the preparation of diethylenetriamine-modified cellulose (DetaCel) by reacting phthalic anhydride-modified cellulose (PhCel) with diethylenetriamine (Deta). Materials were characterized by Elemental Analysis and results showed a degree of incorporation of 5.55 ± 0.02 mmol of nitrogen per gram of modified material. The main bands observed for DetaCel by Fourier-Transform Infrared Spectroscospy (FTIR) were attributed to CN deformation (1330 cm−1) and NH stretching of amide (3400 cm−1), while Solid State Nuclear Magnetic Resonance of 13C (13C{1H}CP-MAS NMR) showed a signal at 164.6 ppm characteristic of amide group. Crystallinity index (CrI) obtained by X-Ray Diffraction (XRD) was 74.99 (Cel), 58.64 (PhCel) and 46.12% (DetaCel). Adsorbent matrices were employed to remove methyl orange (MO) and eosin (EY) dyes in aqueous medium. Data obtained experimentally from kinetic study had a better fit to the pseudo-first order, thus the adsorption process occurs in monolayer, with MO adsorption capacity by Cel and DetaCel of 2.19 and 65.45 mg g−1, respectively. For EY adsorption by Cel and DetaCel was 1.30 and 56.69 mg g−1, respectively. These results suggest that DetaCel can be used as an alternative potential for removal dyes in aqueous solution.
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•The cellulose was chemically modified with phthalic anhydride and subsequently with diethylenetriamine for the sorption of polluting organic molecules.