Synthesis and Modification of CoZnAl Layered Double Hydroxides with Magnetic Nanoparticle and Chitosan for Brilliant Green Dye Adsorption
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Abstract
Cobalt-zinc-aluminum layered double hydroxides (CoZnAl-LDHs) have been prepared and successfully modified with magnetic nanoparticles and chitosan (Fe3O4CS@CoZnAl-LDHs) for being used as Brilliant Green (BG) dye adsorbent to solve the dye contamination in water problem. Magnetic nanoparticles (Fe3O4) allow easy separation of the adsorbent from the solution, and chitosan (CS) will increase the hydroxyl group density for the interaction with the positively charged BG dye. The materials were characterized by XRD and it revealed that the modified materials exhibited the structural characteristics of LDHs. From dye adsorption studies at pH 7 and 25 °C with initial dye concentration of 20 ppm, Fe3O4CS@CoZnAl-LDHs exhibited 99% dye removal, which was greater than that of CoZnAl-LDHs (58%). The adsorption process reached equilibrium within 360 min. In addition, the adsorption isotherm followed Langmuir model, and from the kinetic studies, this adsorption process corresponded to a pseudo second-order reaction. The synthesized material is promising for being used as adsorbent to remove the dye from polluted water.
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