Selective biosorption of thorium (IV) from aqueous solutions by ginkgo leaf

Abstract

Low–cost biosorbents (ginkgo leaf, osmanthus leaf, banyan leaf, magnolia leaf, holly leaf, walnut shell, and grapefruit peel) were evaluated in the simultaneous removal of La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Yb3+, Lu3+, UO22+, Th4+, Y3+, Co2+, Zn2+, Ni2+, and Sr2+ from aqueous solutions. In single metal systems, all adsorbents exhibited good to excellent adsorption capacities toward lanthanides and actinides. In a simulated multicomponent mixed solution study, higher selectivity and efficiency were observed for Th4+ over other metal cations, with ginkgo leaves providing the highest adsorptivity (81.2%) among the seven biosorbents. Through optimization studies, the selectivity of Th4+ biosorption on ginkgo leaf was found to be highly pH–dependent, with optimum Th4+ removal observed at pH 4. Th4+ adsorption was found to proceed rapidly with an equilibrium time of 120 min and conform to pseudo–second–order kinetics. The Langmuir isotherm model best described Th4+ biosorption, with a maximum monolayer adsorption capacity of 103.8 mg g–1. Thermodynamic calculations indicated that Th4+ biosorption was spontaneous and endothermic. Furthermore, the physical and chemical properties of the adsorbent were determined by scanning electron microscopy, Brunauer–Emmett–Teller, X-ray powder diffraction, and Fourier transform infrared analysis. The biosorption of Th from a real sample (monazite mineral) was studied and an efficiency of 90.4% was achieved from nitric acid at pH 4 using ginkgo leaves.

Performance of poly sulfonamide/nano-silica composite for adsorption of thorium ions from sulfate solution

“…6a, at 2+ . In addition, soluble thorium ions such as Th 4+ were the dominant species in strongly acidic solution, while Th 4+ tended to precipitate out as Th(OH) 4 at higher pH, which were remained compatible with the outcomes of earlier studies [48][49][50].…”

Date seed as an efficient, eco-friendly, and cost-effective bio-adsorbent for removal of thorium ions from acidic solutions

“…According to Figure 3A, at pH < 4, thorium ionic species distribution in the solution were mainly involved of positively charged species which are Th 4+ , [Th4(OH)8] 8+ , [Th6(OH)15] 9+ , and Th(OH) 3+ . In addition, soluble thorium ions such as Th 4+ were the dominant species in strongly acidic solution, while Th 4+ tended to precipitate out as Th(OH)4 at higher pH, which were remained compatible with the outcomes of earlier studies (Baybaş and Ulusoy, 2011;Ding et al, 2019;Huang et al, 2018).…”

Evaluation of Methylene Blue Sorption onto Low-Cost Biosorbents: Equilibrium, Kinetics, and Thermodynamics

“…e spectrum range of FTIR was collected between 4000 and 600 cm −1 . e broad band at around 2919 cm −1 corresponds to C-H stretching vibrations of methyl group [27,28]. e peak at 1717 cm −1 can be attributed to C�O stretching vibration of a carbonyl group (carboxyl (-COOH) and ethyl (-COOR) groups).…”