All chemicals and reagents used
were of analytical grade. A stock solution of heavy metals was
prepared by dissolving Pb(NO3)2 and Cu(NO3)2 in distilledwater to a
concentration of 1000 mg/L. Working solutions were prepared by
diluting the stock solution to specific concentrations. For the batch
test, 200 mLof the Pb(II) and Cu(II) solutionswas mixed with 0.2 g of
AC,Mn3O4 orMn3O4/AC and shaken in a shaking incubator for 48 h.