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single and double layer alginate calcium iron gel beads were prepared. The adsorption property of alginate calcium iron gel ball on Cr(VI) was studied, under the existence of Fe. The effects of the number of layers and the sequence of Fe in gel ball on adsorption of Cr(VI) were discusses, and the adsorption kinetics of Cr(VI) were further explored. The results show that the number of layers has little effect on adsorption of Cr(VI) with alginate calcium iron gel beads, the removal rates is more than 96 % after 3 h. The effect of Fe order in gel ball on adsorption of Cr(VI) is obvious, the sequence of adsorption quantity of Cr(VI) is @Fe-@-Fe=@-@-Fe>@-Fe-@. The processes of alginate calcium iron gel beads adsorbed Cr(VI) fit well with quasitwo adsorption kinetics model. The order of their adsorption rates is as follow: @-Fe>@-Fe-@-Fe>@-@-Fe>@-Fe-@. Keywords-calcium-iron-alginate gel beads; adsorption; Cr(VI); dynamics; the quasi-two adsorption kinetics

Adsorption of Cr(VI) from Aqueous Solution with Double Layers Calcium-Iron-Alginate Gel Beads