Uranium sorption from waste solutions by Talc Phosphogypsum ferri-silicate synthetic new sorbent

Abstract

In this investigation, a synthetic Talc Phosphogypsum ferri-silicate TPFS sorbent was prepared by thermal activation then evaluated the uranium ions removal from sulfate waste solution containing uranium. Generally, the synthetic adsorbents from raw and waste materials have a significant attention from scientists because the environmental concern and economic development, particularly, the uranium elimination from radioactive waste solutions. The uranium removal percentage and loading capacity were determined by optimization the conditions of adsorption such as the pH range, adsorbent/adsorbate ratio, uranium concentration of radioactive waste solutions, equilibrium time and temperature. The resultant adsorption efficiency and loading capacity were 87.2% and 375 mg g−1, respectively. The adsorption isothermally was in accordance with Langmuir isotherm model, in addition pseudo-second-order kinetic model, with theoretical capacity of 384.6 and 333 mg g−1, respectively. Uranium (VI) adsorption on TPFS was inhibited at elevated temperatures. The removal of uranium from sulfate waste solution by TPES sorbent according to the thermodynamic functions values was exothermic (∆H of −16.095) and non-spontaneous in nature (∆G of −17.27 at 303 K). In addition, there was a decrease in the randomness at the TPFS/uranium waste solution interface with ∆S value of 3.88.

Thermal activation of kaolinite titanium hydroxide composite for uranium adsorption from aqueous solutions

“…Whereas, Th 4+ ions caused 10% decrease in adsorption efficiency rather than other cations and anions gave about 5% (reduction in adsorption efficiency of uranium is established, i.e. adsorption efficiency reduced from 80 to 70% at 1000 mg/L of Th 4+ ); which may be attributed to the high positive charge (4 +) on thorium ions (Hagag et al 2020).…”

“…Whenever the dependency on nuclear power stations is intensifying, uranium explorations and separations increase as well. Many chemical techniques are designed for uranium separation and removal at the forefront, solvent extraction (Ali et al 2018;Cheira 2020), adsorption (Morsy 2015Feng et al 2019;Yousef et al 2020a, b;Hagag 2020;Khani et al 2006;Amesh et al 2020;Hagag et al 2022;Wang et al 2015;Yousef et al 2020a, b;Li et al 2019 andZhao et al 2020), ion exchange resin ( Aziz et al 2010), inclusion membrane (and Zaheri 2020), liquid emulsion membrane (Sonali et al 2018), and electroplating (Amoli et al 2006). Exactly, solvent extraction and adsorption techniques are the most routinely used.…”