Synthesis and characterization of a novel double network hydrogel based on gellan‐gum crosslinked by octavinyl polyhedral oligomeric silsesquioxane for heavy metal removal

Abstract

AbstractIn this study, we demonstrated a new design technique for producing DNNH based on gellan‐gum crosslinked by octavinyl polyhedral oligomeric silsesquioxane. Incorporating OV‐POSS nanoparticles as cross‐linkers into the first and second networks created strong coordination contacts and improved mechanical performance with 90% water. pH and contact time affect DNNH swelling, Ni(II), and Pb(II) removal. The resulting hydrogels were characterized by FT‐IR, SEM, XRD, and TGA analyzes. The capacity of the hydrogel to adsorb Ni(II) and Pb(II) is 213.66 and 132.55 mg/g, respectively, according to the adsorption isotherm model. The usefulness of kinetic and isotherm investigations, notably the pseudo‐second‐order model and the Langmuir model, for the adsorption of the aforementioned contaminants, was proven. Ni(II) and Pb(II) adsorption is spontaneous and endothermic, according to the study. The hydrogel's adsorption–desorption reusability was renewed five times. As a consequence, the generated hydrogel is recognized as a good adsorbent for aqueous Ni(II) and Pb(II) adsorption.