Synthesis and application of a new carboxylated cellulose derivative. Part I : removal of Co2+, Cu2+ and Ni2+ from monocomponent spiked aqueous solution.
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Date
2016
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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 DadsH 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.
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Keywords
Adsorption, Thermodynamics, Desorption, Isothermal titration calorimetry
Citation
TEODORO, F. S. et al. Synthesis and application of a new carboxylated cellulose derivative. Part I: removal of Co2+, Cu2+ and Ni2+ from monocomponent spiked aqueous solution. Journal of Colloid and Interface Science, v. 483, p. 185-200, dez. 2016. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0021979716305537>. Acesso em: 15 set. 2017.