Efficiency of removal Cr(III), Ni(II), Pb(II) ions from simulated wastewater using natural and modified Ca - bentonite

The aim of this study was to investigate removal efficiency heavy metals and the adsorption capacity natural Ca-bentonite, as well thermally acid-activated Ca-bentonite (with HCl H2SO4) for metal ions Cr(III), Ni(II) Pb(II). adsorbent used is bentonite from Shipovo (Šipovo mine), Bosnia Herzegovina. results show that ion using at a satisfactory level. Thus, highest percentage tested concentration 20 mg/L, while decrease in decreased ions. recorded Cr(III) ions, lowest Ni(II).