Water reuse after removing a textile dye methyl orange using a recyclable hydrotalcite material

Abstract

Hydrotalcite type material based on zinc, aluminum and carbonates was synthesized by coprecipitation method and its derived calcined at 500°C (CHT) was used to remove the textile dye methyl orange (MO). This adsorbent has a great potential for removing pollutants from aqueous solutions without generating sludge. Adsorption was performed in batch experiments. A rapid process of retention confirmed by kinetics reflects a high affinity between CHT material and MO dye. The adsorption isotherms follow the Langmuir model (L type). The results of several techniques suggest the intercalation of the pollutant between the hydrotacite sheets reconstructed from mixed oxides with a gallery of 2.35 nm. The retention capacity reaches 2500 mg/g with a removal rate of 100% for an optimum mass ratio MO/CHT of 0.3. After the recycling studies the material CHT justify its recyclability and confirms its efficiency for eliminating such pollutant.