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https://locus.ufv.br//handle/123456789/23599
Tipo: | Artigo |
Título: | Synthesis and application of a new carboxylated cellulose derivative. Part I: Removal of Co2+, Cu2+ and Ni2+ from monocomponent spiked aqueous solution |
Autor(es): | Ferreira, Gabriel Max Dias Silva, Luis Henrique Mendes da Teodoro, Filipe Simões Ramos, Stela Nhandeyara do Carmo Elias, Megg Madonyk Cota Mageste, Aparecida Barbosa 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 Co2+, Cu2+ and Ni2+ 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 Co2+, Cu2+ and Ni2+, 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 B. V. |
URI: | https://doi.org/10.1016/j.jcis.2016.08.004 http://www.locus.ufv.br/handle/123456789/23599 |
Data do documento: | Dez-2016 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
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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