Adsorption of dyes from aqueous solutions or suspensions with clay nano-adsorbents

The increasing use of organic compounds endangering the environment encourages search for more efficient adsorbents. Clays are natural environment-friendly materials with high specific surface area and now widely used for the adsorption and removal of the organic pollutants. In the present review, the adsorption properties of the raw clays, activated clays by acid-treatment or calcinations, organic-modified clays with small molecules or polymers for the adsorption and removal of organic dyes from aqueous solutions are reviewed. The development perspectives are also proposed. (c) 2007 Elsevier B.V. All rights reserved.