Synthesis and application of sugarcane bagasse cellulose mixed esters. Part I: Removal of Co2+ and Ni2+ from single spiked aqueous solutions in batch mode using sugarcane bagasse cellulose succinate phthalate

Abstract

Sugarcane bagasse cellulose mixed ester succinate phthalate (SBSPh) was synthesized by a novel one-pot reaction method. The effects of temperature, time and mole fraction of succinic anhydride (χ) on the responses weight gain (wg), number of carboxylic acid groups (n), and adsorption capacity (q) of Co and Ni were evaluated by a 2 experimental design. The chemical structure of the material was elucidated by Fourier transform infrared, C Multiple Cross-Polarization solid-state NMR spectroscopy andH NMR relaxometry. The best SBSPh synthesis condition (100 °C, 11 h, χ of 0.2) yielded a wg of 59.1%, n of 3.41 mmol g, and values of q and q of 0.348 and 0.346 mmol g, respectively. The Sips model fitted better the equilibrium data, and the maximum adsorption capacities (pH 5.75 and 25 °C) estimated by this model were 0.62 and 0.53 mmol g for Co and Ni, respectively. The ΔH° values estimated by isothermal titration calorimetry were 8.43 and 7.79 kJ mol for Co and Ni, respectively. Desorption and re-adsorption efficiencies were evaluated by a 2 experimental design, which showed that SBSPh adsorbent can be recovered and reused without significant loss of adsorption capacity.

Application of pyridine-modified chitosan derivative for simultaneous adsorption of Cu(II) and oxyanions of Cr(VI) from aqueous solution

“…All flasks (250 mL Erlenmeyers) containing C1 and solute solutions were stirred in an orbital shaker incubator (Model MA-830, Marconi), followed by a single filtration (C-41 (20 μm) filter paper) to separate the spent C1 adsorbent and the liquid phase. The liquid phases were analyzed by flame atomic absorption spectrophotometry (FAAS) (Model SpectrAA 50B, Varian) (λCu = 324.7 nm, λCr = 425.4 nm) for determination of the Cr(VI) and Cu(II) concentrations (Elias et al, 2019). The FAAS analyses were performed in triplicate.…”

“…The experiments of adsorption and desorption were carried out using the experimental conditions described in Table 2. After desorption, C1 loaded with Cr(VI) or Cu(II) was recovered by single filtration, washed with an excess of ultrapure water, and dried in an oven at 80.0 ºC for 6 h (Elias et al, 2019). The other procedures were the same as described in Section 2.4.…”

Oxidized Renewable Materials for the Removal of Cobalt(II) and Copper(II) from Aqueous Solution Using in Batch and Fixed-Bed Column Adsorption

“…e main advantage of these oxidized materials (SBox and Cox) comparing to other carboxylated materials prepared by our research group [14,15,20,22,[42][43][44][45] is that carboxylic acid functions in SBox and Cox are mainly from the oxidation of primary hydroxyl groups (R-CH 2 OH) of cellulose (in SB or Cel). On the contrary, when carboxylic acid groups are introduced in the Cel or SB through esteri cation reaction with cyclic carboxylic acid anhydrides, the application of esteri ed Cel or SB is limited to a pH range where the ester groups may not be easily hydrolyzed in the aqueous phase, e.g., 2-9 [46].…”

Batch and continuous adsorption of Cu(II) and Zn(II) ions from aqueous solution on bi-functionalized sugarcane-based biosorbent

“…However, the other carboxyl functions bonded to the aromatic ring act as electron-withdrawing groups, due to both the inductive effect and the resonance effect, which increases the stability of the conjugated base (the carboxylate ion). This increases the acidity of at least two carboxylic acid groups (pK a,1 = 1.92, pK a,2 = 2.87, pK a,3 = 4.49, and pK a,4 = 5.63, in water at 25 ºC) (Dean & Lange 1999) of pyromellitic acid (a tetracarboxylic acid), compared to a As the main objective of this study was to synthesize an adsorbent able to remove both metal ions from aqueous solutions, the results obtained using the 2 3 experimental design indicated that the best synthesis condition should use the higher T level (100.0 ºC) and the lower t SA level (1.0 h). For the variable χ SA , the higher χ SA level favored Cu(II) adsorption, while the lower χ SA level favored Zn(II) adsorption.…”