Efficient adsorption of Sr2+ from simulated high-level liquid waste by 4A zeolite

The effective separation of radioactive strontium-90 ( 90 Sr) from high-level liquid waste (HLLW) produced by the PUREX process is essential for enhancing nuclear waste disposal safety and minimizing related expenses. This research work revealed that 4A zeolite showed excellent separation efficiency and selectivity for Sr 2+ in very acidic and alkaline environments that mimic actual HLLW. 4A zeolite displayed superior performance, with an adsorption efficiency of 88.2%, a distribution coefficient (Kd) of 1298.47 mL/g, and a maximum sorption capacity of 18.734 mg/g in comparison to numerous standard sorbents reported for the removal of Sr 2+ . It demonstrated prompt adsorption kinetics (~ 2 h), extensive pH tolerance (pH 4–9), and outstanding resistance to radiation-induced degradation. In comparison to alternative adsorbents, 4A zeolite presents a distinctive amalgamation of superior efficacy, economical costs, simple synthesis, and environmental compatibility, making it a highly promising option for the remediation of 90 Sr in complex nuclear waste streams.