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A novel functional fiber (PAN-CDs) loaded with carbon dots (CDs) with excellent photoreduction and adsorption properties for Cr(Ⅵ) was prepared via an amidization reaction between the CDs’ carboxyl groups and amine groups on polyacrylonitrile (PAN)-based ion exchange fibers,which could completely preserve the fluorescence properties of the CDs.The photoluminescence (PL),photocatalysis and adsorption properties of PAN-CDs were characterized and analyzed.The PAN-CDs possess high adsorption capacity (297.6 mg/g) and excellent kinetic behavior (attaining adsorption equilibrium in 30 min) for Cr(Ⅵ) adsorption.Furthermore,the residual Cr(Ⅵ) (approximately 3 mg/L) after adsorption could be removed completely by subsequent photoreduction by the PAN-CDs.The Cr-saturated PAN-CDs could be easily separated by filtering and regenerated,with no observable decay of removal efficiency after five regeneration cycles.In addition,due to the PL quenching action of Cr(Ⅵ),the PAN-CDs can also be used as sensor for quantitative detection of trace Cr(Ⅵ) in aqueous solution.