Taguchi optimization approach for Pb(II) and Hg(II) removal from aqueous solutions using modified mesoporous carbon

► Using the Taguchi method, the removal of Pb(II) and Hg(II) by zinc oxide-modified CMK-3(Zn-OCMK-3) was optimized. ► The CMK-3 had high surface area which can accommodate ZnO in a spreading manner. ► The results suggest that Zn-OCMK-3 can be effectively used for remediation of Pb (97.25%) and Hg (99%). ► Removal of Pb(II) and Hg(II) were highly concentration dependent.