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In this work, adsorption of methylene blue (MB) onto graphene-based nanocomposite adsorbent has been evaluated on the adsorbent kinetic and thermal parameters sides. Specially, graphene (Gr) was prepared from waste dry battery electrode using a simple electrochemical method and prepared graphene has been used for fabrication of a Fe₃O₄/chitosan/graphene (FCG) nanocomposite by a simple co-precipitation method. Experimental results indicated the adsorption of MB onto FCG follows the pseudo-second order kinetic models as described: t/q_t = 0.02162 + 0.02076.t with R² = 0.99852. Thermodynamic parameters of the adsorption of MB onto FCG were evaluated in temperature range from 283 K to 323 K and extracted data have provided values of ΔG⁰, ΔH° of −9.950 ÷ 6.434 kJ mol⁻¹ and 27.348 kJ mol⁻¹, respectively. The negative values of ΔG⁰ indicate the adsorption of MB onto FCG phenomenon …