The effect of graphene oxide nanoparticle as an additive on the equilibrium curve of aqueous two-phase systems containing polyethylene glycol 6000 and sodium tartrate
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1Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran
2Faculty of Chemical Engineering, Sahand University of Technology, Sahand New Town, Tabriz, Iran
In this work, the effect of graphene oxide (GO) as an additive on the equilibrium curve of aqueous two-phase system composed of polyethylene glycol (PEG 6000) and sodium tartrate was studied. For this purpose, phase diagram of the system (PEG 6000 + sodium tartrate + H2O) was obtained by cloud point titration method. Then, the effect of adding GO nanoparticle at 5 and 10 wt.% on phase diagram was investigated. Also, experimental binodal data were successfully fitted to Merchuk equation. According to the results, adding GO at 5 wt.% increases two-phase region of the system and causes 4.59% deviation on the equilibrium curve. However, addition of 10 wt.% of GO nanoparticle makes no change on the equilibrium data.