Abstract

• Adsorption of congo red from aqueous solution onto rice straw (RS) and coconut husk fibre (CCH) under batch conditions was investigated. Before sorption process, the physicochemical properties of RS and CCH fibre such as moisture content, ash content, bulk density and pH were determined by standard methods. The samples was characterized by SEM. Adsorption was studied as a function of amount of adsorbent, contact time, pH and various concentrations with time. It was carried out at pH 6. A synthetic solution of 25 mg/L of the dye was used. The optimum contact time was 120 min and 0.2g was a suitable dose of sorbent.The sorption properties of congo red were spectrophotometrically determined.The highest removal percent of congo red by rice straw powder (80.31%) and coconut husk fibre powder (74.96%) were observed.