Abstract
Zeolite modified with phosphate (Z/P) was synthesized and tested for Th4+ adsorption. The optimum adsorption conditions are as follows: pH 3.5, contact time of 30 min, 0.1 g of Z/P, initial Th4+ concentration of 400 mg/L, 20% tributyl phosphate (TBP) in toluene as solvent, and room temperature. Kinetics and equilibrium parameters of the Th4+ adsorption onto Z/P were determined. The maximum sorption capacity determined using the Langmuir model reached 92.59 mg/g. The Th4+ adsorption onto Z/P follows a pseudo-second-order kinetic model. Th4+ can be efficiently desorbed from the loaded Z/P with 1 M HNO3 solution. The optimized conditions were applied to the thorium adsorption from a conglomerate sandstone sample of Abu El Toyour, eastern side of Wadi El Sahu, Southwestern Sinai, Egypt.
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