Kinetic, Thermodynamic and Adsorption Isotherms Studies on Removal of Copper(II) Ions from Aqueous Solutions Using Jumbo Grass (Sorghum Bicolur Sorghum Sudanefe)

摘要

The removal of copper(II) ions from aqueous solutions using Jumbo grass (Sorghum Bicolour Sorghum Sudanefe) was studied and to investigate the utilization of this adsorbent. The newly prepared bio sorbent was characterized by FT-IR and scanning electron microscopy. The removal efficiency of copper(II) was carried out by batch mode methods. The adsorption capacity of the bio sorbent was influenced by changing the parameters such as bio sorbent dose, pH, contact time and initial ion concentrations. The maximum removal of copper(II) was 52 % at pH 7 and equilibrium reached at 180 min. From the experimental data the Langmuir, Freundlich and Temkin adsorption isotherm models were arrived and the pseudo first order, pseudo second order, Elovich and intra-particle diffusion kinetic models were also investigated. The monolayer maximum adsorption capacity (Q_m) of the biosorbent achived was 10.53 mg/g. Equilibrium data were well fitted to the Langmuir isotherm model and the pseudo second order kinetic model. Desorption of metal ions were also monitored by hydrochloric acid.