Batch Adsorption of Organic Dyes by Organo-bagasse: Carbon Content, pH Influence, Kinetics and Isotherms

The affecting factors such as carbon content, contact time, solution pH and initial dye concentration on adsorption behavior of three organic dyes, blue21, yellow20, and green40 using organo-bagasse as a biosorbent were investigated. The organo-bagasse was prepared by adsolubilisation using tetradecyltrimethyl ammonium bromide. The precursor and organo-bagasse were characterized by elemental analysis, Brunauer-Emmett-Teller method, Fourier transform infrared spectroscopy, and scanning electron microscopy A number of batch tests were carried out as functions of carbon content, contact time, initial pH solution, and initial dye concentration. The results showed that the adsorption capacity of green40 was the highest, followed by yellow 20 and then blue21. Adsorption of the organic dyes increased as the carbon content in the organic dyes increased. The adsorption of the three dyes reached equilibrium within 3.0 h and at this condition the adsorption capacities of blue21, yellow20, and green40 were 130.50, 166.55 and 174.81 mg/g, respectively. The maximum adsorption was obtained at pH 2.0. The kinetic data followed the pseudo-second order model indicating that the rate of interaction on the biosorbent surface was the rate limiting step. From the above results, the organobagasse was an effective adsorbent for the adsorption of the organic dyes.