Oxalate Intercalated Mg/Cr Layered Double Hydroxide as Adsorbent of Methyl Red and Methyl Orange From Aqueous Solution

Abstract

There are more than 100,000 dyes commercially available with more than 107 tonnes of dyes produced annually worldwide. These dyes are widely used by several industries such as foods, cosmetics, paper printings, and the textile industries as the largest dye consumers (Benkhaya et al., 2020). Dyes commonly used in industry can be classified as natural and synthetic dyes. According to Rubia & Bhardwaj, (2016), natural dyes have properties that are non-toxic, non-carcinogenic, eco-friendly, biodegradable, and easy to dispose of. However, the use of natural dyes is now starting to be replaced by synthetic dyes. Natural dyes are limited and more expensive than synthetic dyes. On the other hand, synthetic dyes are toxic on aquatic environment because of their non-durable, unstable, and lacking color variations (Zhao et al., 2018). Some of the most abundant synthetic dyes are methyl red (MR) and methyl orange (MO). These dyes have an azo functional group (-N=N-) and are classified as anionic dyes (Shan

Modified Layered Double Hydroxide Mg/M3+ (M3+ = Al and Cr) Using Metal Oxide (Cu) as Adsorbent for Methyl Orange and Methyl Red Dyes

“…Water pollution due to dye waste will have a negative impact on the ecosystem and the surrounding environment, but this impact will be visible in the long term. Therefore, it is necessary to treat the dye waste [5].…”