نوع مقاله : مقاله پژوهشی
موضوعات
عنوان مقاله English
نویسندگان English
In this study, a nanocomposite hydrogel was synthesized from a biodegradable polymer (chitosan), grafted with acrylic acid and crosslinked by polyethyleneimine. The hydrogel was prepared via the sol–gel method to enable selective platinum removal and recovery from aqueous solutions. To enhance adsorption capacity and structural integrity, graphene oxide nanoparticles were incorporated into the network. Characterization by FTIR, BET, XRD and TGA confirmed successful formation of the chitosan–grafted acrylic acid nanocomposite hydrogel. TGA results indicated thermal stability up to 274 °C. Adsorption data were modeled using the Langmuir isotherm, yielding a maximum capacity of 217.4 mg g⁻¹. A Gibbs free energy change of –1,473J mol⁻¹ was calculated, indicating spontaneity of the process. Across three consecutive adsorption cycles, the graphene oxide–reinforced hydrogel achieved platinum uptake efficiencies of 98%, 84.42% and 70.69%. Corresponding desorption stages released 85%, 72% and 60% of the adsorbed platinum, respectively.
کلیدواژهها English
