Adsorption of Malachite Green from Aqueous Solution Using Hydroxyethyl Starch Hydrogel Improved by Graphene Oxide

This study is the first report of preparation hydroxyethyl starch (HES) hydrogels rapidly crosslinked with divinyl sulfone in a single step and pot. To develop physical chemical features hydrogels, Graphene oxide (GO) nanoparticles were combined HES. In addition to swelling studies, structural characterization samples was conducted scanning electron microscope (SEM) transmission (TEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometry (XRD), Brunauer–Emmett–Teller (BET) analysis thermogravimetric (TGA). For removal malachite green model dye by GO-HES, effects GO content, solution concentration, temperature, contact duration, dosage pH on varying adsorption researched. Additionally, isotherms, kinetic thermodynamic systematics analyzed. The maximum capacity GO-HES composite hydrogel found be 89.3 mg/g for Langmuir isotherm. possible mechanism involved electrostatic, hydrogen bonding, ?–? interactions. reasonable cost simple synthesis method, prepared materials have potential use wastewater treatment as adsorbents from aqueous solutions due efficient capacity.