Fabrication, Characterization and Adsorption Investigation of Nano Zinc Oxide–Sodium Alginate Beads for Effective Removal of Chromium (VI) from Aqueous Solution

Abstract Alginate–zinc oxide (Alg–ZnO) biocomposite was synthesized and tested as a chromium ions Cr(VI) adsorbent for environmental applications. Alg–ZnO prepared by the interaction between sodium alginate biopolymer zinc nanoparticles (ZnO–NPs), modified wet chemical method. The solid adsorption characteristics of were characterized Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), UV–Vis spectroscopy. Adsorption isotherms on investigated with varying initial concentration under different application conditions such pH, contact time, dosage, temperature. isotherm models Langmuir, Freundlich, Temkin Dubinin–Radushkevich models. Maximum capacities (31.09 34.63 mg/g) achieved ZnO–NPs Alg–ZnO, respectively at 25 °C. results indicate perfect applicability Langmuir models, revealing dominance monolayer physisorption onto studied adsorbents.