CC-BY-NC-NDGorgievski, MilanMarković, MiljanBožić, DraganaStanković, VelizarŠtrbac, NadaGrekulović, VesnaZdravković, Milica2023-12-262023-12-262021978‐86‐6305‐119‐5https://ioc.tfbor.bg.ac.rs/public/2021/Proceedings_IOC_2021.pdfhttps://repozitorijum.tfbor.bg.ac.rs/handle/123456789/2703In this paper Langmuir, Freundlich, and Temkin adsorption isotherm models were used for describing the adsorption of copper ions onto walnut shells. The adsorption was performed in a batch system. The obtained isotherm data were fitted using the mentioned models, and the isotherm parameters were calculated from the linearized plots corresponding to each model. The Langmuir adsorption isotherm model showed the best agreement with the analyzed experimental data, with the correlation coefficient R2 = 0.993. According to this model, the adsorption process occurs until a complete monolayer of copper ions is formed on the surface of the walnut shells. The maximum adsorption capacity, according to this model, was 7.71 mg g-1.enAdsorption isothermswalnut shellsadsorption capacitycopper ionsbatch systemconferenceObject