Akademik Veri Yönetim Sistemi
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 2026 (SCI-Expanded, Scopus)
This study investigates the adsorption of uranium (VI) ions onto thermally activated Oltu clay (TAOC) produced through single-step calcination at 700 degrees C. The effects of solution pH, initial concentration, contact time, and temperature were systematically examined. Characterization by FTIR and SEM confirmed surface modifications induced by thermal activation and revealed evidence of uranium uptake. TAOC achieved a maximum adsorption capacity of 35.97 mg g(-1) and removal efficiencies exceeding 96%, with equilibrium established after approximately 2 h under the optimum condition of pH 3. The adsorption process followed pseudo-second-order kinetics and was best described by the Freundlich isotherm, indicating heterogeneous multilayer uptake. Thermodynamic parameters revealed a spontaneous and exothermic mechanism (Delta H = - 90.79 kJ mol(-1)), reflecting strong interactions between U(VI) ions and the activated clay surface. These results highlight TAOC as a low-cost, locally available, and sustainable material with high efficiency, offering valuable insights into the mechanisms governing uranium adsorption and indicating its suitability for uranium removal and environmental remediation applications.