15A novel biosorbent derived from agricultural residue -walnut shell (WS) is reported to remove cesium from aqueous 16 solution. Nickel hexacyanoferrate (NiHCF) was incorporated into this biosorbent, serving as a high selectivity trap 17 agent for cesium. Field emission scanning electron microscope (FE-SEM) and thermogravimetric and differential 18 thermal analysis (TG-DTA) were utilized for the evaluation of the developed biosorbent. Determination of kinetic 19 parameters for adsorption was carried out using pseudo first-order, pseudo second-order kinetic models and 20 intra-particle diffusion models. Adsorption equilibrium was examined using Langmuir, Freundlich and

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