Adsorption of methylene blue and congo red dye from water onto cassava leaf powder

Abstract

The suitability of Cassava leaf (CL) as low-cost adsorbent for dyes adsorption was evaluated in this study. Methylene blue (MB) and Congo red (CR) dye was chosen as adsorbate in this work as these two types of dyes are widely used in the industries. The impactof various parameters such as adsorbent dosage, pH, temperature and contact time for dye adsorption on CL were investigated. 99.9% removal of MB dye was achieved at pH of 11.0, temperature of 45 °C, 0.5 g of CL under 60 minutes of contact time. Meanwhile, 99.7% removal of CR dye was obtained under similar contact time but at pH of 2.0, room temperature and smaller dosage of CL at 0.2 g. Based on the isotherms study, MB dye adsorption was best fitted in both Langmuir and Freundlich isotherms while Temkin isotherm was best fitted for CR dye adsorption on CL.