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In the present study, crab shell chitin (CSC) has been used for the recovery of Mo(VI) from Cu/Fe containing solutions. The CSC gel showed a high affinity for Mo(VI) compared with other adsorbents, and the maximum adsorption capacity was evaluated as 252.27 mg g −1 in the case of pH 1, which could be explained by the structure of the CSC gel, containing more reactive −OH and/or −NH groups binding Mo(VI) ions. The experimental results fit satisfactorily to the Langmuir isotherm in comparison to the Freundlich, Temkin, and Dubinin−Radushkevich models. Biosorption kinetics data were successfully modeled using a nonlinear pseudo-second-order model. The sorption mechanism was investigated in detail through FTIR, EDS, and the percentage of positively charged amide analyses. Moreover, its excellent adsorption properties and applicability for Mo(VI) were demonstrated by the recovery and separation of Mo(VI) from Cu or/and Fe binary and ternary mixtures.

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