Investigation of the Adsorption of Eosin B Dye with Graphene Oxide: Effect of Synthesis Methods and Adsorption Conditions
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Keywords:
Graphene Oxide, Eosin B, Adsorption, Dye, pHAbstract
The contamination of industrial wastewater with dyes causes toxic effects on aquatic
organisms and poses risks to human health. Among existing wastewater treatment methods, adsorption
stands out due to its simplicity, efficiency, and low cost. Graphene oxide (GO) is one of the most studied
materials due to its high specific surface area, good stability in aqueous environments, and oxygenated
functional groups (hydroxyl, carboxyl, and epoxide) that facilitate interactions with organic molecules. In
this study, GO was synthesized using three different methods (Staudenmaiermaier, Staudenmaiermaier
Hummers, and Hummers) and subsequently used for the adsorption of eosin B in aqueous solutions.
Furthermore, the effects of the type of base (NaOH, KOH, NH₄OH) and different pH values (pH: 2, 5,
and 9) on the adsorption process were investigated. Samples were analyzed in terms of % eosin B
adsorbed and the amounts of eosin B (mg)/GO (g). Experiments were conducted at 25 °C, at an initial
concentration of 300 ppm, using 0.1 g of GO and stirring for 24 h. The results show that the Hummers
method has the highest adsorption capacity. Adsorption efficiency reaches its maximum value,
particularly in the basic environment created by using NaOH, and the highest efficiency under pH
influence was obtained at pH 2. These findings confirm the critical role of surface functionalization and
electrostatic charges in the GO-dye interaction and demonstrate the promising potential of GO as an
effective absorbent in the treatment of colored wastewater.
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