Synthesis of Graphene Oxide using Hummers Method as Adsorbent of Malachite Green Dye

Abstract

Graphene oxide materials were successfully synthesized using the Hummer method with XRD, FTIR, and BET characterization results. Graphene oxide material was used as malachite green dye adsorbent. The surface area of graphene oxide material and the maximum adsorption capacity were 157.360 m2/g and 106.383 mg/g. The selectivity process of graphene oxide material to the three dyes showed the most effective malachite green dye. The optimum pH of adsorption was obtained at pH 4. The optimum time of adsorption occurred at 120 minutes and the kinetics model followed PSO. The isotherm data followed Langmuir isotherm and the adsorption process was endoetrmic and spontaneous. The regeneration results showed the ability up to five cycles with a decrease of 40.019% from 96.698% to 56.679%.

Composite Layered Double Hydroxide Zn-Al/Magnetic Biochar Modified for Highly Effective Malachite Green Adsorption

“…This can be seen from the instability in Figure 9 that results from the repeated use of LDH Zn-Al, magnetic biochar, and composite LDH Zn-Al/magnetic biochar. Adsorption of malachite green by Amri and Hanifah (2023) using graphene oxide material from the first cycle to the fifth cycle decreased by 40.19%. This shows that adsorption with composite LDH Zn-Al/magnetic biochar is more effective in regeneration.…”

“…At pH < pH pzc, this indicates a positive charge on the adsorbent surface, so this can increase the adsorption capacity due to the attractive force between the positive charge of the adsorbent and the negative charge on the dye (Ahmad et al, 2023). Based on the research by Amri and Hanifah (2023) on the adsorption of malachite green using graphene oxide, the optimum pH > pHpzc on graphene oxide material. This suggests that the graphene oxide surface has a large number of negative charges.…”

Efficient Adsorption of Methylene Blue Dye Using Ni/Al Layered Double Hydroxide-Graphene Oxide Composite

“…Various methods can be used in removing MB dye pollutants, including coagulation, flocculation, membrane filtration, advanced oxidation process, photocatalytic degradation, and adsorption [7][8][9][10][11]. Adsorption is the most extensively utilized approach among these options due to its ease of use, low cost, and high efficacy [12][13][14].…”