Selective Adsorption of Cationic and Anionic Dyes using Ni/Al Layered DoubleHydroxide Modified withEucheuma cottonii

Abstract

This study investigates the selective adsorption capabilities of Ni/Al Layered Double Hydroxide (LDH) modified withEucheumacottoniifor the removal of cationic and anionic dyes from aqueous solutions. The primary objective was to evaluate the efficiencyand selectivity of these modified adsorbents towards different dyes, including rhodamine-b, malachite green, methylene blue(cationic dyes), and direct yellow, methyl orange, direct green (anionic dyes). The modification process aimed to enhancethe adsorption properties of LDHs, leveraging the natural adsorption capabilities ofEucheuma cottonii. Experimental resultsdemonstrated significant differences in adsorption percentages among the tested dyes, with malachite green showing thehighest adsorption efficiency among cationic dyes, indicating a strong affinity of the modified adsorbents towards cationic dyes.However, the ability to also adsorb anionic dyes suggests the dual-functionality of the modified LDHs, making them versatileagents for dye removal in water treatment applications.