STUDY ON MODIFICATION OF PYROLUSITE ORE APPLIED AS AN ADSORBENT TO REMOVE HEAVY METALS ION Pb(II), Cd(II) IN WATER

Abstract

In this study, pyrolusite ore was simply modified by NaOH, HCl solutions and
at 500
o
C for 2h. The modified pyrolusite sample has a small, fairly uniform
particle size and an improved surface area (25m2
/g). Modified pyrolusite sample
were applied to adsorb Pb2+
and Cd2+
ions with the maximum adsorption
capacity of 41.84mg/g Pb(II) and 69.93mg/g Cd(II). The pH values and reaction
times that directly affect the removal performance of heavy metal ions were
investigated. Under optimal conditions (metal ion concentration 20mg/L and pH
of 5), pyrolusite samples can remove up to 82.26% and 67.87% of Pb(II), Cd(II)
metal ions, respectively. The isothermal adsorption process of Pb(II) and Cd(II)
ions on modified pyrolusite follows the Langmuir model.