Produção Nacional
Revisado por pares
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
2018; Elsevier BV; Volume: 516; Linguagem: Inglês
10.1016/j.jcis.2018.01.068
ISSN1095-7103
AutoresAmália Luísa Pedrosa Xavier, Oscar Fernando Herrera Adarme, Laís Milagres Furtado, Gabriel Max Dias Ferreira, Luís Henrique Mendes da Silva, Laurent Frédéric Gil, Leandro Vinícius Alves Gurgel,
Tópico(s)Adsorption and biosorption for pollutant removal
ResumoIn 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 (ΔadsH°) of adsorption of the metal ions onto STA were determined by isothermal titration calorimetry (ITC). The values of ΔadsH° were in the range of 3.0–6.8 kJ/mol, suggesting that the adsorption process involved physisorption. Desorption (Edes) and re-adsorption (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.
Referência(s)