REMOVAL ORANGE G DYE FROM AQUEOUS SOLUTIONS USING GRAPHENE OXIDE/MAGNESIUM OXIDE NANO COMPOSITE
Amir Fahdil Dawood AL-Niaimi, Abdulilah Ahmed Olaiwy · International Journal of Research in Pharmacy and Chemistry · 2019
Nanocomposite comprised of grapheme oxide (GO) nanosheets and magnesium oxide (MgO) nanoparticles were synthesized by a sol-gel method.The GO/MgONCs synthesized weight ratio of GO /MgO 1:1 The synthesized samples were characterized using (FT-IR,X-ray diffraction, AFM ,SEM) The results showed that MgO particles was decorated on GO.The adsorption of Orange G dye from aqueous solution onto GO/MgO NCs as adsorbent by batch method, under various experimental conditions including contact time , GO/MgO NCs dosage ,pH, temperature, and initial Orange G dye concentration was investigated .Adsorption isotherms been used to test the adsorption data for (Langmuir, Freundlich, Dubinin, Temkin) as it was fit to Langmuir isotherm and type S according to Gilles classification .Thermodynamic functions data such as (ΔH°, ΔG°, ΔS°) of the adsorption process were calculated, which show the adsorption endothermic process and the value of ΔG° was negative this indicate that the adsorption happened spontaneously while the value of ΔS° is positive that meaning the movement of dye molecules is unrestricted.Kinetic data were fit to pseudo-second order mode.