Removal of a Basic Textile Dye from Aqueous Solution by Adsorption on Regenerated Clay

This work presents a study on the reuse of spent bleaching earth (SBE). The SBE waste was regenerated by impregnation in NH4Cl solution followed by heat treatment at 400 °C and washing with 1 M HCl. The regenerated material (RSBE) was used in the treatment of a basic textile dye solution. Results showed that the adsorption phenomenon governing this process was best described by the Langmuir model. The adsorption kinetic process was found to follow a pseudo second order model.