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https://locus.ufv.br//handle/123456789/19167
Tipo: | Artigo |
Título: | Regular article synthesis and application of a new carboxylated cellulose derivative. Part I: Removal of Co 2+ , Cu 2+ and Ni 2+ from monocomponent spiked aqueous solution |
Autor(es): | Ferreira, Gabriel Max Dias Teodoro, Filipe Simões Ramos, Stela Nhandeyara do Carmo Elias, Megg Madonyk Cota Mageste, Aparecida Barbosa Silva, Luis Henrique Mendes da Gil, Laurent Frédéric Gurgel, Leandro Vinícius Alves |
Abstract: | A new carboxylated cellulose derivative (CTA) was prepared from the esterification of cellulose with 1,2,4- Benzenetricarboxylic anhydride. CTA was characterized by percent weight gain (pwg), amount of carboxylic acid groups (nCOOH), elemental analysis, FTIR, TGA, solid-state ^13C NMR, X-ray diffraction (DRX), specific surface area, pore size distribution, SEM and EDX. The best CTA synthesis condition yielded a pwg and nCOOH of 94.5% and 6.81 mmol g^−1, respectively. CTA was used as an adsorbent material to remove Co^2+, Cu^2+ and Ni^2+ from monocomponent spiked aqueous solution. Adsorption studies were developed as a function of the solution pH, contact time and initial adsorbate concentration. Langmuir model better fitted the experimental adsorption data and the maximum adsorption capacities estimated by this model were 0.749, 1.487 and 1.001 mmol g−1 for Co^2+, Cu^2+ and Ni^2+, respectively. The adsorption mechanism was investigated by using isothermal titration calorimetry. The values of ΔadsH° were in the range from 5.36 to 8.09 kJ mol^−1, suggesting that the mechanism controlling the phenomenon is physisorption. Desorption and re-adsorption studies were also performed. Desorption and re-adsorption efficiencies were closer to 100%, allowing the recovery of both metal ions and CTA adsorbent. |
Palavras-chave: | Carboxylated cellulose 1,2,4-Benzenetricarboxylic anhydride Adsorption Desorption Isothermal titration calorimetry Thermodynamics |
Editor: | Journal of Colloid and Interface Science |
Tipo de Acesso: | Elsevier Inc |
URI: | https://doi.org/10.1016/j.jcis.2016.08.004 http://www.locus.ufv.br/handle/123456789/19167 |
Data do documento: | 2-Ago-2016 |
Aparece nas coleções: | Artigos |
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Arquivo | Descrição | Tamanho | Formato | |
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artigo.pdf Until 2100-12-31 | texto completo | 2,48 MB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
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