Removal of Toxic Congo Red Dye from Aqueous Solution Using a Graphene Oxide/Poly (Acrylamide-Acrylic acid) Hydrogel: Characterization, Kinetics and Thermodynamics Studies

This research studies the removal of textile dye (Congo red (CR)) from aqueous solution via using low-cost adsorbent prepared from GO/P (AA-co-AM) composite. Batch adsorption experiments were conducted to estimate the influence of several factors like pH solution, the concentration of CR dye, equilibrium time, adsorbent amount, and temperature solution. The top result correlation was found via the Langmuir model, and the best adsorption efficiency was 52.55 mg g^–1 for CR dye. Thermodynamic studies appear that the adsorption of CR dye was feasible, endothermic, and spontaneous. Through the results, the prepared surface has very high efficiency in removing textile dyes and is environmentally friendly, inexpensive.