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

• Published in: Journal of colloid and interface science 2019-09, Vol.552, p.337-350
• Main Authors: Almeida, Francine Tatiane Rezende de, Elias, Megg Madonyk Cota, Xavier, Amália Luísa Pedrosa, Ferreira, Gabriel Max Dias, Silva, Isabela Almeida, Filgueiras, Jefferson Gonçalves, Azevedo, Eduardo Ribeiro de, Silva, Luis Henrique Mendes da, Gil, Laurent Frédéric, Gurgel, Leandro Vinícius Alves
• Format: Article
• Language: English
• Subjects: 13C Multiple Cross-Polarization solid-state NMR; Cobalt; Fixed-bed column adsorption; Isothermal titration calorimetry; Nickel; Sugarcane bagasse mixed ester
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2019.05.046

[Display omitted] 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.