Adsorption of Direct Red 80 Dye from Solution by Sugarcane Bagasse and Modified Sugarcane Bagasse as Adsorbents

摘要

The sugarcane bagasse and modified sugarcane bagasse with 1.0 M H_2SO_4 were used as adsorbents for removal of the direct red 80 in batch adsorption process. The effect on the initial concentration of the direct red 80, at 215.8 - 1028.9 mg/L, was thoroughly investigated in batch adsorption system. It was fount that the point of zero charge of sugarcane bagasse and modified sugarcane bagasse were pH 4.9 and 2.0, respectively. The adsorption capacity increased with initial concentration of direct red 80. The experimental results showed that adsorption capacity onto 1.0 g of sugarcane bagasse and modified sugarcane bagasse for direct red 80 initial concentration 1,028.9 mg/L were 4.2 and 28.9 mg/g, respectively. The Langmuir and Freundlich adsorption isotherms were applied to describe the direct red 80 uptake, which could be described by Langmuir isotherm onto both adsorbents.