Adsorption of Reactive Orange 13 (RO13) onto Puffed Rice in Aqueous Solution

Adsorption of reactive orange 13(RO13) from aqueous solution onto puffed rice was investigated. Batch system and effects of effective parameters include pH, initial dye concentration, ionic strength and temperature was studied. It was found that maximum adsorption of reactive orange 13 onto puffed rice was at pH2, and extent of adsorption increases with increasing initial dye concentration and increasing temperature whereas the adsorption of RO13 decreases with the increase of ionic strength of the dye solution. Based on the result, it can be said pseudo-second order kinetic model is the best model for explanation of adsorption of RO13 onto puffed rice. The experimental adsorption data best fitted with the Langmuir’s isotherm model. Which indicates the adsorption is involved with monomolecular. The thermodynamic parameters such as adsorption enthalpy (H), entropy (S) and free energy (G) were evaluated by applying Van’t Hoff equation for the system which indicated the process involved with physisorption. The negative values of free energy (G) determined for this systems indicated that adsorption of Reactive Orange-13 was spontaneous at the temperatures under investigation (303-318 K). Puffed rice could be suggested as relatively efficient and low cost adsorbent for dye removal from textile wastewater.