ADSORPTION OF HEAVY METALS FROM AQUEOUS SOLUTIONS BY Moringa Oleifera PODS AND FELDSPAR CLAY COMPOSITE

摘要

Pollution removal from contaminated water is a vital step in environmental and human health protection.For impoverished countries,using biomaterials to remove heavy metals from polluted water is an environmentally benign and cost-effective strategy.In this study,Moringa Oleifera pod-Modified Feldspar Clay(MFC)was calcined after being modified with the Moringa Oleifera pod.The efficiency of these adsorbents in the aqueous solution adsorption of Pb~(2+),Cu~(2+),and Cd~(2+)ions was investigated as a function of pH,time,initial concentration,and temperature.The adsorption maximum capacities of Cu~(2+),Cd~(2+),and Pb~(2+)by MFC were 54.42 mg·g~(-1),41.26 mg·g~(-1),and 35.16 mgg~(-1),respectively.The Langmuir and Freundlich isotherm equations ascertain and used to analyze the equilibrium isotherm data.The adsorption process fit the pseudo-second-order(PSO)kinetics well in all cases,and the Langmuir isotherm equation fit the experimental data well.ΔG~0 values up to-10 kJ.mol~(-1)are coherent with electrostatic interaction between adsorption sites and the metal ion,physisorption.