Adsorption of Cadmium from Aqueous solution using Leonardite-Bentonite Ceramic as Absorbent

Abstract

The leonardite-bentonite ceramic (LBC) was prepared and used in batch adsorption experiments in order to remove cadmium from aqueous solution. The prepared LBC was characterized by FTIR and BET surface area. The effect of various parameters on adsorption process such as pH, contact time and amount of LBC was carried out at room temperature to optimize the conditions for maximum adsorption. The optimum pH of cadmium adsorption onto 1.00 g of LBC was found to be 7 with a contact time 120 min. The kinetic results of adsorption indicated that the adsorption of cadmium onto LBC fitted with pseudo-second order model. From adsorption isotherms, maximum sorbed amount of cadmium was 6.98 mg g^-1.?? The equilibrium adsorption data for cadmium was better fitted to Freundlich isotherm model. Finally, the application studies carried out using industrial wastewater sample. The results found that LBC was applied successfully for cadmium removal from wastewater sample at cadmium concentration below 10 mg L^-1. ????