Synthesis and application of sugarcane bagasse cellulose mixed esters. Part II : removal of Co2+ and Ni2+ from single spiked aqueous solutions in batch and continuous mode.
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Date
2019
Authors
Almeida, Francine Tatiane Rezende de
Carvalho, Megg Madonyk Cota Elias
Xavier, Amália Luísa Pedrosa
Ferreira, Gabriel Max Dias
Silva, Isabela Almeida
Filgueiras, Jefferson Gonçalves
Azevedo, Eduardo Ribeiro de
Silva, Luís Henrique Mendes da
Gil, Laurent Frédéric
Gurgel, Leandro Vinícius Alves
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Abstract
Sugarcane bagasse cellulose succinate trimellitate (SBST) was prepared by a one-pot synthesis method. The synthesis of this novel mixed ester was investigated by a 23-factorial design. The parameters investigated were time, temperature, and succinic anhydride mole fraction (χSA). The responses evaluated were the adsorption capacity (qCo2+ and qNi2+), weight gain (wg), and number of carboxylic acid groups (nT,COOH). 13C Multiple Cross-Polarization solid-state NMR spectroscopy, 1H NMR relaxometry, and Fourier-transform infrared spectroscopy were used to elucidate the SBST structure. The best SBST reaction conditions were 100 °C, 660 min, and χSA of 0.2, which yielded SBST with a wg of 57.1%, nT,COOH of 4.48 mmol g−1, and qCo2+ and qNi2+ of 0.900 and 0.963 mmol g−1, respectively. The maximum adsorption capacities (Qmax) (pH 5.75, 25 °C) estimated by the Redlich-Peterson model for Co2+ and Ni2+ were 1.16 and 1.29 mmol g−1. The ΔadsH° values for Co2+ and Ni2+ adsorption obtained by isothermal titration calorimetry were 8.03 and 6.94 kJ mol−1. Regeneration and reuse of SBST were investigated and the best conditions applied for fixed-bed column adsorption in five consecutive cycles. SBST was fully desorbed and Qmax values for Co2+ (0.95 mmol g−1) and Ni2+ (1.02 mmol g−1) were estimated using the Bohart-Adams model.
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Keywords
Sugarcane bagasse mixed ester, 13C multiple cross-polarization solid-state, Nickel, Cobalt
Citation
ALMEIDA, F. T. R. et al. Synthesis and application of sugarcane bagasse cellulose mixed esters. Part II: removal of Co2+ and Ni2+ from single spiked aqueous solutions in batch and continuous mode. Journal of Colloid and Interface Science, v. 552, p. 337-350, set. 2019. Disponível em:<https://www.sciencedirect.com/science/article/pii/S0021979719306022>. Acesso em: 10 fev. 2020.