ADSORPTION ATUDIES ON THE REMOVEL OF COLOR OF METHYLEN BLUE USING MATERIAL TEA WASTE

Abstract

   The potentiality of tea waste for the adsorptive removal of methylene blue, a  cationic   dye, from aqueous solution was studied. Batch kinetics and isotherm studies were carried out under varying experimental conditions of contact time, initial methylene blue concentration, adsorbent dosag, pH... The nature of  the possible adsorbent and methylene blue interactions was examined by the FTIR technique.The pHpzc of the adsorbent was estimated by titration method and a value of  5,23 was obtained. Anadsorption-desorption study was carried out resulting the mechanism of adsorption was reversible and ion-exchange. Adsorption equilibrium of tea waste reached within 2 h for methylene blue. The extentof the dye removal increased with increasing initial dye concentration. The equilibrium data in aqueoussolutions were well represented by the Langmuir isotherm model. The adsorption capacity of methyleneblue onto tea waste was found to be as high as 178,57 mg/g. Tea waste appears as a very prospective adsorbent for the removal of methylene blue from aqueous solution. 

Keywords:  Adsorption; tea waste; isothermal Langmuir; methylene blue; cationic dye.