Adsorption Model in Removal of Direct Synthetic Dyes in Aqueous Solution onto Tea Waste

Abstract

Direct synthetic dyes are one of the dye types that commonly used in the textile industry. The simple procedure, color variation, and intensity become a good consideration to it. Wastewater that produces contained synthetic organic compounds that caused the reduction of dissolved oxygen level in the water. The tea waste contained high cellulose of 37% that become adsorp media. The purpose of this study was to find out the effect of the initial of dye concentration on adsorption by tea waste and whether the adsorption kinetics followed the Thomas, Yoon-Nelson, and Adam-Bohart, model. The study was carried out by a continuous process with variations in initial concentrations of adsorbate. The adsorption column was buret apparatus with 50 ml of volume. The tea waste placed in the buret. The samples were analyzed by using UV-Vis Spectrophotometer. The research reported that tea waste could be utilized to adsorp direct synthetic dyes. The increases of initial concentration will obtain higher dye adsorption. The tea waste adsorbent removed 46.72-51.44 % of dye with experimental of adsorption capacity was 41.085 to 147.814 mg/g. The kinetic model of this experiment followed Thomas model with R2 values ranging from 0.892 to 0.970, and the adsorption capacity was in the range 191.78-577.686 mg/g.