High efficiency of calcined anionic clay to remove the chromate anions CrO42-from polluted water

Mourid, E. H., Lakraimi, M., Benaziz, L. (2020). High efficiency of calcined anionic clay to remove the chromate anions CrO42-from polluted water. French-Ukrainian Journal of Chemistry, 8(2), 26–47. https://doi.org/10.17721/fujcV8I2P26-47

Calcined anionic clay based on zinc and aluminum was used to remove the pollutant CrO42- from wastewater. This adsorbent material derived from layered double hydroxide (LDH) was chosen for its higher adsorption capacity, its affinity for most pollutants, and its non-toxicity. The kinetic study suggesting a high affinity between the pollutant and calcined LDH (CLDH). The pollutant is retained in multilayer and follows the Freundlich model. Thermodynamic study indicates a physical interaction. The elimination reaches 100% with a retention capacity of 3333 mg/g. After cycles of regeneration and in comparison with other adsorbents, CLDH has proven its efficiency and high performances to remove CrO42- anions.