BIOSORPTION OF ORGANIC AND INORGANIC POLLUTANTS FROM SIMULATED WASTEWATER BY USING EQUISETUM HORSETAIL

Abstract

Equisetum horsetail was used to poducebioadsorbent through easy and environmental friendly processes. This equisetum based biosorbent was evaluated for removal of Hg2+ and furfural from simulated wastewater using granule equisetum horsetail was investigated. Batch type experiments were carried out to find the equilibrium isotherm data for single and binary system. Many isotherm models were used for single component and binary system. Langmuir model gave the best fitting for the single system (R2 Fu = 0.9946 and R2Hg2+= 0.9935), while the binary system was fitted successfully with extended Langmuir model (R2 Fu = 0.9977and R2Hg2+ = 0.9969).Pseudo-first order, pseudo-second order, intra-particle diffusion and Elovich choose forkinetic study. Pseudosecond order model was well fitted for Hg2+ and furfural (R2 Fu = 0.9942 and R2Hg2+ = 0.9910). Thermodynamic parameters including the Gibbs free energy and enthalpy changes indicated that the biosorption of furfural and Hg2+ ions onto biosorbent was feasible, spontaneous and exothermic reactions. Significant desorption of Hg2+ and furfural from simulated wastewater were obtained when using 0.1M NaOH and HCl.