Enhanced adsorption capacity of dyes by surfactant-modified layered double hydroxides from aqueous solution

The utilization of organo-modified layered double hydroxides with anionic surfactants (organo-LDHs) as adsorbents were successfully carried out to remove various synthetic dyes from aqueous solution. Intercalation of anionic surfactants changed the surface properties of MgAl-LDH from hydrophilic to hydrophobic, and a charge inversion occurred with increasing the length of surfactant chains. Such changes in the surface properties of the organo-LDHs were important. Experimental data shown that the SNS-modified MgAl-LDH could be used as a broad-spectrum adsorbent to effectively remove anionic, non-ionic, and cationic dyes from aqueous solution. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.