Trimellitated sugarcane bagasse: A versatile adsorbent for removal of cationic dyes from aqueous solution. Part I: Batch adsorption in a monocomponent system

Renata Aparecida Fideles; Gabriel Max Dias Ferreira; Filipe Simões Teodoro; Oscar Fernando Herrera Adarme; Luis Henrique Mendes da Silva; Laurent Frédéric Gil; Leandro Vinícius Alves Gurgel

doi:10.1016/j.jcis.2018.01.025

Trimellitated sugarcane bagasse: A versatile adsorbent for removal of cationic dyes from aqueous solution. Part I: Batch adsorption in a monocomponent system

J Colloid Interface Sci. 2018 Apr 1:515:172-188. doi: 10.1016/j.jcis.2018.01.025. Epub 2018 Jan 6.

Authors

Renata Aparecida Fideles¹, Gabriel Max Dias Ferreira¹, Filipe Simões Teodoro¹, Oscar Fernando Herrera Adarme², Luis Henrique Mendes da Silva³, Laurent Frédéric Gil⁴, Leandro Vinícius Alves Gurgel⁵

Affiliations

¹ Grupo de Físico-Química Orgânica (GFQO), Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, s/n°, Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil.
² Laboratório de Química Tecnológica e Ambiental, Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Universitário Morro do Cruzeiro, s/n°, Bauxita, 35450-000 Ouro Preto, Minas Gerais, Brazil.
³ Grupo de Química Verde Coloidal e Macromolecular, Departamento de Química, Centro de Ciências Exatas e Tecnológicas, Universidade Federal de Viçosa, Avenida P.H. Rolfs, 36570-000 Viçosa, Minas Gerais, Brazil.
⁴ Grupo de Química Orgânica Ambiental (GQOA), Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, s/n°, Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil.
⁵ Grupo de Físico-Química Orgânica (GFQO), Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, s/n°, Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil. Electronic address: legurgel@iceb.ufop.br.

PMID: 29335184
DOI: 10.1016/j.jcis.2018.01.025

Abstract

Trimellitated-sugarcane bagasse (STA) was used as an environmentally friendly adsorbent for removal of the basic dyes auramine-O (AO) and safranin-T (ST) from aqueous solutions at pH 4.5 and 7.0. Dye adsorption was evaluated as a function of STA dosage, agitation speed, solution pH, contact time, and initial dye concentration. Pseudo-first- and pseudo-second-order, Elovich, intraparticle diffusion, and Boyd models were used to model adsorption kinetics. Langmuir, Dubinin-Radushkevich, Redlich-Peterson, Sips, Hill-de Boer, and Fowler-Guggenheim models were used to model adsorption isotherms, while a Scatchard plot was used to evaluate the existence of different adsorption sites. Maximum adsorption capacities for removal of AO and ST were 1.005 and 0.638 mmol g^-1 at pH 4.5, and 1.734 and 1.230 mmol g^-1 at pH 7.0, respectively. Adsorption enthalpy changes obtained by isothermal titration calorimetry (ITC) ranged from -21.07 ± 0.25 to -7.19 ± 0.05 kJ mol^-1, indicating that both dyes interacted with STA by physisorption. Dye desorption efficiencies ranged from 41 to 51%, and re-adsorption efficiencies ranged from 66 to 87%, showing that STA can be reused in new adsorption cycles. ITC data combined with isotherm studies allowed clarification of adsorption interactions.

Keywords: Adsorption; Auramine-O; Desorption; Isothermal titration calorimetry; Safranin-T; Sugarcane bagasse.