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BIBTEX RIS

Modeling mono- and multi-component adsorption of cobalt(II), copper(II), and nickel(II) metal ions from aqueous solution onto a new carboxylated sugarcane bagasse. Part I: Batch adsorption study

2015; Elsevier BV; Volume: 74; Linguagem: Inglês

10.1016/j.indcrop.2015.05.022

ISSN

1872-633X

Autores

Stela Nhandeyara do Carmo Ramos, Amália Luísa Pedrosa Xavier, Filipe Simões Teodoro, Megg Madonyk Cota Elias, Fernanda Goncalves, Laurent Frédéric Gil, Rossimiriam Pereira de Freitas, Leandro Vinícius Alves Gurgel,

Tópico(s)

Extraction and Separation Processes

Resumo

A new carboxylated-functionalized sugarcane bagasse (STA) was prepared through the esterification of sugarcane bagasse with trimellitic anhydride. The optimized synthesis conditions yield STA with a percent weight gain of 73.9% and the number of carboxylic acid groups accounted for 3.78 mmol/g. STA was characterized by FTIR, elemental analysis, TGA, PZC, and SEM. Adsorption kinetics followed a pseudo-second-order model. The adsorption rate constant showed the following order: k2,Ni2+ > k2,Cu2+ > k2,Co2+. Four mono- and multi-component isotherm models were used to model the adsorption systems. Monocomponent experimental data were fitted to Langmuir and Sips models; whereas, multicomponent data were fitted to modified extended Langmuir and P-factor models. The maximum adsorption capacities (Qmax,mono) obtained from the Langmuir model were 1.140, 1.197, and 1.563 mmol/g for Co2+, Cu2+, and Ni2+, respectively. The competitive studies demonstrated that the multicomponent adsorption capacity (Qmax,multi) was smaller than Qmax,mono, as a result of the interaction between the metal ions. Desorption studies showed that all metal ions could be fully desorbed from STA.

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