Thorium(IV) Removal and Recovery from Aqueous Solutions using Tannin-Modified Poly(glycidylmethacrylate)-Grafted Zirconium oxide Densified Cellulose

Abstract

A novel adsorbent, tannin-modified poly(glycidylmethacrylate)-grafted zirconium oxide-densified cellulose (TMPGZDC) was synthesized by graft copolymerization reaction of glycidylmethacrylate onto zirconium oxide densified cellulose (ZDC) in the presence of N,N 0 -methylenebisacrylamide as cross-linker followed by tannin immobilization, and well characterized. The adsorption efficiency of TMPGZDC toward thorium(IV) from aqueous solutions was studied at different optimized conditions. The optimum pH for maximum adsorption was found to be 5.5 with the adsorption percentage of 99.2% for an initial concentration of 10 mg/L. Equilibrium was achieved within 2 h. The kinetic data were found to follow pseudo-second-order model, which assumes the presence of chemisorption. The temperature dependence indicates an exothermic process. The well agreement of equilibrium data with Langmuir isotherm and Redlich-Peterson isotherm models confirms the monolayer coverage of Th(IV) onto TMPGZDC surface and the maximum adsorption capacity was found to be 96.7 mg/g. Complete removal of Th(IV) from simulated seawater was possible with an adsorbent dosage of 3.0 g/L. Spent adsorbent was effectively degenerated with 0.1 M HNO 3 . The present investigation shows that TMPGZDC is a promising adsorbent for the removal and recovery of Th(IV) from aqueous solutions.

Synthesis of poly(hydroxamic acid) ligand from polymer grafted corn-cob cellulose for transition metals extraction

“…Our synthesized ligand from corn‐cob cellulose exhibited greater adsorption ability corresponding to other cellulose‐based adsorbents. Table represents a comparison of adsorption capacities of similar adsorbent materials …”

“…They also claimed that this adsorbent could be successfully regenerated. Tannin‐modified poly(glycidyl methacrylate)‐grafted zirconium oxide‐densified cellulose is a recent adsorbent developed by Anirudhan et al . They synthesized this from graft copolymerization of glycidyl methacrylate onto zirconium oxide densified cellulose in the presence of N,N‐methylene bis acrylamide as cross linker and applied the prepared adsorbent for the adsorption of Th 4+ ion from simulated seawater.…”

Effective removal of mercury(II) ions from chlor-alkali industrial wastewater using 2-mercaptobenzamide modified itaconic acid-grafted-magnetite nanocellulose composite

“…The DH°value found to be negative (À67.23 kJ/mol) indicating the exothermic nature of Hg(II) adsorption onto P(MB-IA)-g-MNCC [31]. The DS°(À188.73 J/mol K) value found to be negative, indicates that randomness decreases during the adsorption process [32]. The DG°values were found to be À11.93, À10.04, À8.15 and À6.27 kJ/mol at 20, 30, 40 and 50°C, respectively indicate the spontaneous nature of reaction.…”

EBT anchored SiO23-D microarray: a simultaneous entrapper of two different metal centers at high and low oxidation states using its highest occupied and lowest unoccupied molecular orbital, respectively

“…Aqueous chemistry of Th (IV) is pH dependent [5,6] and the conductance as well as the extraction is species dependent [7] . An aliquot containing 11.7 mL of Th(IV) (4×10 -2 mol L -1 ) in 20 mL hexamine buffer (pH 2.5-7.5) was passed through the column continuously till its saturation (498 µmol g -1 ) at a flow rate of 2.0 mL -1 min at 27 0 C to assess the effect of pH on extraction.…”