Agricultural wastes as a low cost adsorbents for the removal of Acid Blue 92 dye: A Comparative study with Commercial activated carbon

In the present study, activated carbons of Eichornea crasssipes(EC), Sugarcane bagassae(SB), Tea waste(TW) and Guava leaf(GL) were prepared from agricultural wastes and used as an adsorbents for the removal of Acid Blue 92 (AB92) dye from aqueous solution. The effects of pH, adsorbent dosage, initial dye concentration and contact time on the extent removal of AB92 has been studied by Batch adsorbtion method. The Langmuir and Freundlich isotherm models were applied for the present systems and the Langmuir model was applied to the equilibrium data better. The kinetic data followed the first -order kinetics determined from the Natarajan-Khalaf isotherm, Lagergren isotherm and Bhattacharya Venkobachar isotherm. The intraparticle diffusion was also measured to determine the porousities of the carbons and the boundary effect of the carbons on the adsorption of AB92. Effect of particle size of adsorbents and the thermodynamic parameters of adsorbents can also analysed. The desorption was also studied. From the data GUC has the more relative adsorption capacity and the ECC has the lesser among the above charcoal.