Fly ash/cement/graphene oxide composite (FACGO) was prepared by cement curing method using fly ash and graphene oxide as raw materials.The adsorption characteristics of FACGO to copper were studied.The reaction mechanism was discussed by using kinetic model,adsorption isotherm model and thermodynamic model.The results showed that FACGO had a large specific surface and irregular surface roughness.The adsorption rate of fac go to copper was faster and reached over 98% within 2h.Compared with the quasi-first-order kinetic model,the adsorption of FACGO conformed to the quasi-second-order kinetic model,and its adsorption behavior was mainly chemical adsorption.Compared with the Freundlich isotherm models,Langmuir isotherm models can well described the adsorption of copper by FACGO,with the maximum adsorption reached 28.490mg/g.It showed that the adsorption of Cu2+ by FACGO belongs to monolayer adsorption;The adsorption of copper by FACGO was a spontaneous endothermic reaction,and its optimum pH was about 6.The adsorption behavior of FACGO to Cu2+ was mainly the result of physical adsorption,chemical adsorption and flocculation,and mainly based on chemical adsorption and ion exchange adsorption.Thus,FACGO was proved to be a stable and efficient adsorbent.
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