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https://locus.ufv.br//handle/123456789/19906
Tipo: | Artigo |
Título: | Trimellitated sugarcane bagasse: A versatile adsorbent for removal of cationic dyes from aqueous solution. Part I: Batch adsorption in a monocomponent system |
Autor(es): | Fideles, Renata Aparecida Ferreira, Gabriel Max Dias Teodoro, Filipe Simões Adarme, Oscar Fernando Herrera Silva, Luis Henrique Mendes da Gil, Laurent Frédéric Gurgel, Leandro Vinícius Alves |
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. |
Palavras-chave: | Sugarcane bagasse Adsorption Auramine-O Safranin-T Desorption Sothermal titration calorimetry |
Editor: | Journal of Colloid and Interface Science |
Tipo de Acesso: | Elsevier Inc. |
URI: | https://doi.org/10.1016/j.jcis.2018.01.025 http://www.locus.ufv.br/handle/123456789/19906 |
Data do documento: | 6-Jan-2018 |
Aparece nas coleções: | Artigos |
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Arquivo | Descrição | Tamanho | Formato | |
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artigo.pdf Until 2100-12-31 | Texto completo | 3,4 MB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
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