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

Amália Luísa Pedrosa Xavier; Oscar Fernando Herrera Adarme; Laís Milagres Furtado; Gabriel Max Dias Ferreira; Luis Henrique Mendes da Silva; Laurent Frédéric Gil; Leandro Vinícius Alves Gurgel

doi:10.1016/j.jcis.2018.01.068

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

J Colloid Interface Sci. 2018 Apr 15:516:431-445. doi: 10.1016/j.jcis.2018.01.068. Epub 2018 Feb 6.

Authors

Amália Luísa Pedrosa Xavier¹, Oscar Fernando Herrera Adarme¹, Laís Milagres Furtado¹, Gabriel Max Dias Ferreira², Luis Henrique Mendes da Silva³, Laurent Frédéric Gil¹, Leandro Vinícius Alves Gurgel⁴

Affiliations

¹ Group of Physical Organic Chemistry (GPOC), Department of Chemistry, Institute of Biological and Exact Sciences (ICEB), Federal University of Ouro Preto, Campus Morro do Cruzeiro, Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil.
² Group of Physical Organic Chemistry (GPOC), Department of Chemistry, Institute of Biological and Exact Sciences (ICEB), Federal University of Ouro Preto, Campus Morro do Cruzeiro, Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil; Group of Colloidal and Macromolecular Green Chemistry, Department of Chemistry, Federal University of Viçosa, Av. P.H. Rolfs, s/n°, 36570-000 Viçosa, Minas Gerais, Brazil.
³ Group of Colloidal and Macromolecular Green Chemistry, Department of Chemistry, Federal University of Viçosa, Av. P.H. Rolfs, s/n°, 36570-000 Viçosa, Minas Gerais, Brazil.
⁴ Group of Physical Organic Chemistry (GPOC), Department of Chemistry, Institute of Biological and Exact Sciences (ICEB), Federal University of Ouro Preto, Campus Morro do Cruzeiro, Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil. Electronic address: legurgel@iceb.ufop.br.

PMID: 29408133
DOI: 10.1016/j.jcis.2018.01.068

Abstract

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 (Q_max), efficiency of the adsorption process (EAP), and effective use of the bed (H). The higher Q_max 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 (Δ_adsH°) of adsorption of the metal ions onto STA were determined by isothermal titration calorimetry (ITC). The values of Δ_adsH° were in the range of 3.0-6.8 kJ/mol, suggesting that the adsorption process involved physisorption. Desorption (E_des) and re-adsorption (E_re-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 E_des and E_re-ads were 95 and 92.3%, respectively, showing that STA is a promising candidate for real applications on a large scale.

Keywords: Design of experiments; Desorption; Fixed-bed adsorption; Isothermal titration calorimetry; Metal ion; Modeling.