Self-assembling ZiF-8 on electronegative Galdieria sulphuraria for uranium (VI) adsorption performance study

Galdieria sulphuraria (GS) show distinctive physiological traits For the removal of metal ions in aqueous solution, Algal powder have a limited capacity for uranium adsorption. This research institute introduces a innovative approach, The surface electronegativity of GS and the particle size of metal-organic framework (MOF) were modified. ZiF-8 was effectively synthesized on the surface of microalgae to adsorption of uranium (VI) from aqueous solutions. Improve the uranium adsorption capacity of microalgal biomaterials, Characterization analyses conducted using a microplate reader, SEM, XRD, FT-IR, and XPS collectively demonstrate the successful assembly of the MOF on the surface of GS and adsorption of uranium. The results of the adsorption experiments demonstrate that the adsorption capacity of microalgae self-assembly ZIF-8 is markedly superior to that of the unmodified microalgae. The material has the highest adsorption capacity at pH 5. The adsorption behavior aligns with the Sips isotherm model, with a maximum adsorption capacity of approximately 908 mg·g −1 . Kinetic experiments are accurately described by the pseudo-second-order model, The adsorption process is predominantly governed by chemisorption. The thermodynamic parameters (ΔG < 0,ΔH > 0) show that the adsorption process is spontaneous and endothermic in nature. The adsorption capacity exhibits an increase as the temperature rises. This material exhibits effective stability and maintains a high adsorption capacity after undergoing four consecutive adsorption cycles. Compared with inorganic materials, bio-inorganic hybrid materials exhibit Excellent potential for environmental compatibility.