Effective Adsorption of Malachite green oxalate on Modified Layered Double Hydroxide

Humans are exposed to a variety of environmental pollutants. Cationic triarylmethane dyes such as malachite green are aromatic xenobiotic compounds that causing environmental pollution. Malachite green has been traditionally used as a parasiticide and fungicide in aquaculture and other industries. These compounds are also used as additives in food industries. However, their accumulation in the fish tissues and their carcinogenetic properties, have caused these compounds to be banned from use in the fish food aquaculture in most countries. Also, regarding this substance, the presence of nitrogen in its structure poses a major threat to the aquatic environment and human health. Therefore, research on the elimination and destruction of this compound in the environment is important. Double layer hydroxides (LDH) are 2D materials that have received attention in adsorption processes due to their easy synthesis, low cost, high surface area, and high adsorption capacity. Theoretically, there is no limit to the type of cations and interlayer anions, which causes a great deal of structural diversity in the LDH family. In the present study, to achieve cost-effective adsorption with the highest removal efficiency, a variety of interlayer anions were examined. Finally, thiosulfate-modified LDH with a removal efficiency of about 90% was used to remove malachite green from the aqueous solution with reproducible results. Identification of the adsorbent was done with some instrumental techniques and optimal parameters in the adsorption process were investigated.