الفهرس 
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Abstract
In order to improve the adsorption capacity of natural layered double hydroxyl (LDH) materials, the natural organic sources such as algae containing hydroxyl groups, amino groups, peptide connections, and alginate structure were used to improve LDH for the preparation of Zn Mg Al LDH-algae composites (LDH-Ax). The structure of prepared composites was established and characterized via various techniques such as scanning electron microscope (SEM), X-ray diffraction, and FTIR. LDH-A2 sample displayed the highest efficiency for Cr (VI) removal reached to 99% at the optimum conditions. The prepared composite LDH-A2 showed high stability and reusability (91.7 %) after five cycles. The kinetic studies revealed that the Cr uptake by LDH-A1 is described as Pseudo-First order, while in the case of LDH-A2 is described as Pseudo-Second order. This study reported that the easily synthesized LDH-Ax has an interesting environmental approval process to eliminate Cr ions from aqueous mediums quickly and effectively.
Keywords: LDH, Algae, composite, adsorption, Cr (VI) ions, equilibrium.