Thorium(IV) removal by nano olive pomace and its nano biochar: A comparative study
Year: 2025
Type: article
Abstract: Olive pomace and prepared biochar were characterized by thermal gravimetric analysis (TGA), differential thermal analysis (DTA), Fourier transform infrared (FTIR), Scanning electron microscope (SEM), X-ray diffraction (XRD), Brunauer-Emmett Teller (BET), elemental analysis, specific surface area, bulk density, pore volume, cation-exchange capacity, and pHpzc. The effects of initial thorium(IV) ions concentration, adsorbent dosage, initial pH, contact time, and temperature on the adsorption onto olive pomace and biochar were investigated using the batch method. A pseudo-second-order kinetic model controls the adsorption of Th(IV) ions, as shown by the kinetic analysis. The Langmuir adsorption isotherm, Freundlich, Dubinin-Radushkevich (D-R), Temkin, and metal ions uptake onto olive pomace and biochar were used to study the adsorption isothermal behavior of the metal ions uptake. The isothermal data for adsorbed metal ions onto olive pomace and biochar were best presented by the Langmuir isotherm. The maximum Th(IV) adsorption capacities onto olive pomace and biochar were 68.0 and 154 mg g-1 at pH 4.0 and 45.0 oC, respectively. The adsorption of Th4+ onto olive pomace and biochar was an endothermic (positive ΔH°), spontaneous (negative ΔG°), and random process (positive ΔS°). After adsorption, Th(IV) ions were recovered by treating the loaded biochar and olive pomace with 1.0 or 0.1 M HNO3. The first and second stages of recovery employing 1.0 M HNO3 produced the highest percent recovery of Th(IV). The data showed that these adsorbents can be utilized effectively and affordably to extract thorium ions.
Source: Adsorption Science & Technology
Institution: University of Jordan
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,500
OpenAlex ID: W4413163393