Waste graphite rods from waste batteries, acting as a source of graphite, were electrochemically exfoliated to synthesize graphene. Mesoporous graphene with a pore size of 14.81 Å and a surface area of 710.396 m2g−1 was chosen for adsorptive studies involving toxic dyes, Brilliant Blue (BB) and Malachite Green (MG), by varying the graphene dosage, contact period, temperature, pH, and the concentration of the dye solution. The maximum adsorption capacities reported were 120 mg gBB−1 and 342 mg gMG−1, with dye removal rates of BB and MG greater than 99 and 98 %, respectively. Adsorption occurred as multilayer, following the Freundlich isotherm model, and the pseudo‐second‐order kinetic model fitted best, indicating chemisorption. Thermodynamic studies reveal an exothermic, spontaneous, and chemical adsorption.

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Graphene synthesis has been carried out electrochemically with the source being graphite rods mechanically separated from waste model batteries. TEM, Raman spectroscopic analysis has been used to characterize the exfoliated graphene. Mesoporous graphene nanoparticle has been confirmed through BET analysis wherein the surface area and the pore diameter has been reported as 710.4 m 2 /g and 29.6 Å respectively. The synthesized graphene nanoparticle is used to adsorb Methylene blue (MB) dye which is toxic by nature and the parameters studied are the dosage of adsorbent graphene, MB concentration, temperature and contact time. From UV, XRD, and FTIR the adsorption of MB on graphene has been confirmed. The graphene's adsorption capacity at 30 0 C was 272 mg/g. The adsorption followed fitted Temkin isotherm whereas the mechanism was pseudo-second-order. Physisorption and spontaneous adsorption process was reported by the thermodynamic study of the adsorption process.