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 283K 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 occurred spontaneously. The positive value of ΔH° suggests the endothermic in nature and small value of ΔH° also implies a physical adsorption. These obtained results are useful to control the adsorption of MB onto graphene-based nanocomposite adsorbents in term organic dyes removal from solution.

在这项工作中，已在吸附剂动力学和热参数方面评估了亚甲基蓝（MB）在石墨烯基纳米复合材料吸附剂上的吸附。特别地，使用简单的电化学方法由废电池干电极制备石墨烯（Gr），并且所制备的石墨烯已通过简单的共沉淀方法用于制备Fe ₃ O ₄ /壳聚糖/石墨烯（FCG）纳米复合材料。实验结果表明，MB在FCG上的吸附遵循所述的拟二级动力学模型：t / q _t = 0.02162 + 0.02076.t，R ² = 0.99852。在283K至323 K的温度范围内评估了MB在FCG上的吸附热力学参数，提取的数据提供了ΔG值^0的ΔH°分别为-9.950÷6.434 kJ mol ^-1和27.348 kJ mol ^-1。ΔG的负值⁰表示MB吸附到FCG现象发生自发。ΔH°的正值表明吸热性，而ΔH°的小值也意味着物理吸附。这些获得的结果可用于控制从溶液中去除有机染料的过程中MB在石墨烯基纳米复合材料吸附剂上的吸附。