STUDY OF MUSTARD STEM HUSK FOR THE REMOVAL OF COMASSIE BRILLIANT BLUE R250 DYE BY ADSORPTION TECHNIQUE

Abstract

Dyes are usually toxic and harmful for living organisms, due to their stability and non degradable nature. Many industrial effluents contain different types of dyes, which are then sent to the water streams. In present studies the removal of comassie brilliant blue R250 (CBB) dye was carried out by using Mustard stem husk (MH). The batch adsorption method was adopted for the removal of dye under the optimized conditions of amount of adsorbent, contact time, concentration of dye and temperatures. Spectrophotometric technique was adopted for the measurement of concentration of dye before and after adsorption. The adsorption isotherm models such as Langmuir, Freundlich, and Dubinin Radushkevich were applied to elaborate the respective constants. By obtaining 0.980 r2 value it was estimated that Langmuir isotherm is the best fitted model. pH of point zero charge was also evaluated. Thermodynamic parameters such as the changes in enthalpy (?H?), entropy (?S?), and Gibbs' free energy (?G?) were determined to find out the nature of adsorption process. The kinetics models were considered to evaluate the rate constant. The value of rate constant was found to be 2.6 × 10-3 by applying pseudo second order kinetics. The morphology of MH was evaluated before and after adsorption of dye by scanning electron microscopy (SEM). Preliminary adsorption studies have shown that mustard stem husk possess a good affinity for dye and about 62% removal of CBB was observed. The present work can be used for the safety of living organisms from harmful diseases caused by using polluted water.