BATCH SORPTION EXPERIMENTS: DUBININ-KAGANER-RADUSHKEVICH (DKR) ISOTHERM STUDIES FOR THE REMOVAL OF INDIGO DYE ON RICE BRAN AS A LOW-COST ADSORBENT
Abstract
Adsorption of indigo dye onto rice bran has been studied using batch-adsorption techniques. This study was carried out to examine the adsorption capacity of the low-cost adsorbent for the removal of the dye. The influence of contact time, pH, temperature, adsorbate concentration and adsorbent dose on the adsorption process was also studied. Results revealed that adsorption rate initially increased rapidly with the aforementioned parameters. The values; 40 minutes, 3.0, 0.3g, 40 mgL-1, and 55 0C gave the optimum contact time, pH, adsorbent dosage, adsorbate concentration and temperature, respectively. The adsorption isotherm was well fitted by the Dubinin-R model with R2 as high as 0.95. The sorption energy of 0.7kJmol-1obtained from the Dubinin-R isotherm reveals that physisorption was the dominant adsorption mechanism. Results indicate that the freely abundant, locally available, low-cost adsorbent, rice bran can be treated as economically viable for the removal of indigo dye from industrial effluents.
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