Graphene oxide-chitosan composite material as adsorbent in removing methylene blue dye from synthetic wastewater

• Published in: Materials today : proceedings Vol. 64; pp. 1587 - 1596
• Main Authors: Bryan, M.Y.K., Chai, P.V., Law, J.Y., Mahmoudi, E.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2022
• Subjects: Adsorption; Composite; Graphene Oxide; Graphene-Oxide-Chitosan; Synthetic Wastewater; Graphene-Oxide-Chitosan; Synthetic Wastewater; Composite; Adsorption; Graphene Oxide
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2022.03.092

•Preparation of GO-C composite was successful.•The optimum conditions for the adsorption of MB using GO and GO-C were pH 10, a contact time of 50 min, a temperature of 30 °C and a dosage of 1250 mg/L.•GO-C achieved 99.36 % of dye sequestration in MB synthetic dye wastewater.•GO-C retained 91.90% of MB dye sequestration after three cycles of adsorption–desorption. Graphene oxide (GO) and graphene oxide-chitosan (GO-C) were synthesized and its performance in removing methylene blue (MB) dye synthetic wastewater were evaluated. Characterization technique such as measurement of zeta potential and FITR were employed to examine the surface potential of the adsorbent and presence of functional group respectively. The adsorption of MB by GO and GO-C was favored at the alkaline condition and lower temperature. The optimum conditions for the adsorption of MB using GO and GO-C were pH 10, a contact time of 50 min, a temperature of 30 °C and a dosage of 1250 mg/L. GO-C demonstrated higher adsorption capacity and dye removal efficacy due to the presence of the secondary adsorption sites that were attributed to the cross-linking of chitosan with GO. GO-C achieved 99.36 % of dye sequestration in MB synthetic dye wastewater after optimization of all parameters had been performed. Spent GO and GO-C were regenerated efficiently using absolute ethanol. GO and GO-C retained 91.79% and 91.90% of MB dye sequestration, respectively, after three cycles of adsorption–desorption and therefore, proving that GO-based adsorbents have an excellent ability to regenerate and reuse in synthetic dye wastewater.