Adsorption of reactive dye Remazol Brilliant Blue R from aqueous solutions by rambutan peel

Adsorption of Remazol Brilliant Blue R (RBBR) by rambutan peel (RP) was examined. The adsorption experiments were carried out under different conditions of initial concentration (25-500 mg/L), solution pH 2-12 and RP dose (0.05-1.2 g). The influence of these parameters on the adsorption capacity was studied using the batch process. RBBR adsorption uptake was found to increase with increase in initial concentration and contact time. The RBBR adsorption was favourable at pH<;4. Langmuir, Freundlich and Temkin isotherm models were used to illustrate the experimental isotherms and isotherms constant. The equilibrium data were best represented by Langmuir isotherm model, showing maximum monolayer adsorption capacity of 112.69 mg/g. The rates of adsorption were found to obey the rules of pseudo-second order model with good correlation. The results suggested that RP has high potential to be used as effective adsorbent for RBBR removal.