Sanusi, K. A.; Yahaya, Y.; Ambrusa, M. M.; Yahaya, Y. .; Hammed, A. M. OPTIMIZATION OF ADSORPTION OF Pb (II) AND Cr (VI) FROM AQUEOUS SOLUTION USING MODIFIED FELDSPAR COMPOSITE: ISOTHERM AND KINETIC STUDIES. Int. J. Eng. Sci. Tech 2021, 5, 18-53.