Modeling adsorption of copper(II), cobalt(II) and nickel(II) metal ions from aqueous solution onto a new carboxylated sugarcane bagasse. Part II : Optimization of monocomponent fixed-bed column adsorption.
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2018
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In the second part of this series of studies, the monocomponent adsorption of Cu2+, Co2+ and Ni2+ onto STA
adsorbent in a fixed-bed column was investigated and optimized using a 22 central composite design. The
process variables studied were: initial metal ion concentration and spatial time, and the optimized
responses were: adsorption capacity of the bed (Qmax), efficiency of the adsorption process (EAP), and
effective use of the bed (H). The higher Qmax for Cu2+, Co2+ and Ni2+ were 1.060, 0.800 and 1.029
mmol/g, respectively. The breakthrough curves were modeled by the original Thomas and Bohart-
Adams models. The changes in enthalpy (DadsH ) of adsorption of the metal ions onto STA were determined
by isothermal titration calorimetry (ITC). The values of DadsH were in the range of 3.0–6.8
kJ/mol, suggesting that the adsorption process involved physisorption. Desorption (Edes) and readsorption
(Ere-ads) of metal ions from the STA adsorbent were also investigated in batch mode, and
the optimum conditions were applied for three cycles of adsorption/desorption in a fixed bed column.
For these cycles, the lowest values of Edes and Ere-ads were 95 and 92.3%, respectively, showing that
STA is a promising candidate for real applications on a large scale.
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Fixed-bed adsorption, Modeling, Metal ion, Design of experiments
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XAVIER, A. L. P. et al. Modeling adsorption of copper(II), cobalt(II) and nickel(II) metal ions from aqueous solution onto a new carboxylated sugarcane bagasse. Part II : Optimization of monocomponent fixed-bed column adsorption. Journal of Colloid and Interface Science, v. 516, p. 431-445, 2018. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0021979718300833?via%3Dihub>. Acesso em: 05 abr. 2018.