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.
J Colloid Interface Sci
; 552: 337-350, 2019 Sep 15.
Article
em En
| MEDLINE
| ID: mdl-31132636
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, 660â¯min, and χSA of 0.2, which yielded SBST with a wg of 57.1%, nT,COOH of 4.48â¯mmolâ¯g-1, and qCo2+ and qNi2+ of 0.900 and 0.963â¯mmolâ¯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 1.29â¯mmolâ¯g-1. The ΔadsH° values for Co2+ and Ni2+ adsorption obtained by isothermal titration calorimetry were 8.03 and 6.94â¯kJâ¯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+ (0.95â¯mmolâ¯g-1) and Ni2+ (1.02â¯mmolâ¯g-1) were estimated using the Bohart-Adams model.
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MEDLINE
Assunto principal:
Celulose
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Cobalto
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Saccharum
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Ésteres
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Níquel
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article