Adsorption of Cu2+ in wastewater on Humus Soil

Abstract:

A batch test was made to evaluate the adsorption properties of Copper on humus soil. Several factors have been studied with regarding their effects on adsorption characteristics, such as adsorption time, initial concentration, humus dosage, initial pH and temperature. Furthermore the relevant mechanisms have been studied with assistance of adsorption kinetics, adsorption isotherm and FTIR. The results show that the amount of Cu2+ adsorbed on humus soil increases with adsorption time until it reaches equilibrium, and increases with the increase of initial Cu2+concentration and initial solution pH value, while decreases with the increase of humus dosage, and temperature almost does not affect the adsorption. The adsorption process follows the pseudo-second-order model and Freundlich adsorption isotherm equations, and the adsorption process mainly bases on chemical adsorption. The analysis of FTIR indicates that the main groups involved in adsorption are hydroxyl and aromatic.