Removal of textile dyes from industrial effluents using burnt brick pieces: adsorption isotherms, kinetics and desorption

Abstract

Textile dyes, namely Sumifix Blue Exf (Dye 1), Sumifix Rubine Exf (Dye 2) and Sumifix Yellow Exf (Dye 3), show their characteristic λmax values at 605 nm, 545 nm and 415 nm, respectively. Gel electrophoresis of the three individual dyes investigated indicates that all of them are negatively charged. Among different adsorbents, brick clay shows the highest efficiency for the removal of dyes from aqueous solution. The optimum values of experimental parameters, namely treatment temperature, adsorbent dosage, shaking time, settling time and initial solution pH determined to be 200 °C, 4.0 g, 15.0 min, 15.0 min and pH Dye 3 (3333 mg kg−1 min−1), and further, real dye effluent containing each of the above dyes having calculated initial concentrations of 42 mg L−1 (Dye 1), 106 mg L−1 (Dye 2) and 39 mg L−1 (Dye 3), shows, 87%, 86% and 45% removal efficiencies at their λmax values with the treatment of burnt brick clay particles under optimized conditions. Desorption of the dyes from the dye-adsorbed adsorbent indicates that desorption prefers basic conditions.