2 nd International Conference on Multidisciplinary Research & Practice Page | 8 Volume III Issue I IJRSI ISSN 2321-2705 Adsorption of Reactive Orange 13 (RO13) onto Puffed Rice in Aqueous Solution T.K Saha, Subir Chowdhury Department of Chemistry, Jhangirnagar University Savar, Dhaka, Bangladesh Abstract:- 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. Key words- Adsorption, Physisorption, Dye removal, Isotherm models, Low cost adsorbent. I. INTRODUCTION he textile dying industry consume huge amount of water and produce a large amount of wastewater [1]. Generally in dyeing processes, huge amount of the dye is lost in the wastewater. This unused residual dyes remain in the process water. Due to high water solubility and characteristic brightness of the dyes [2] create serious environmental pollution when discharges them without treatment. Different methods have been used for dye removal from wastewater include biological methods and physicochemical methods such as electrocoagulation, membrane filtration, ion exchange, coagulation, , floating, filtration and advanced oxidation [3]-[5]. Most of these technologies are luxurious, on the contrary adsorption methods can be considered the suitable one for its potentiality for application in industrial wastewater treatment, because their efficiency is proven in the removal of organic and mineral pollutants and economic considerations [6]-[7]. Various materials have been used as adsorbents for dye removal including orange and banana peels [8], apple peel and wood [9]. Still scientists are trying to find new cost effective adsorbent. In this study puffed rice used as adsorbent to adsorp amaranth from aqueous solution. II. EXPERIMENTAL A. Materials Puffed rice was collected from local market and was used without further purification although it was grained to make powder. The size distribution of puffed rice was determined using a laser scattering particle size analyzer (LDSA-2400A, Tonochi Computer Applications Japan) equipped with a dry dispersing apparatus (PD-10S, Tonochi Computer Applications Japan). Sample is a composed of large particles and small ones in diameter which is confirmed by the peaks around 32μm, 53μm and 355μm in frequency (Figure not given). The Reactive orange13 (RO13) was obtained from Sigma-Aldrich Germany and was used without purification. The chemical structure of RO13 is shown in Fig: 1. All other reagents and solvents were highest grade of purity. Deionized water was prepared by passing distilled water through a deionizing column (Branstead, Syboron Corporation, boston. USA). Fig: 1 Chemical structure of Reactive orange 13 B. Characterization: Zero point charge (pH ZPC ) of puffed rice was determined. The FTIR spectra of reactive orange13 and puffed rice T