SiO2/graphene composite for highly selective adsorption of Pb(II) ion

► SiO2/graphene composite prepared by a facile chemical route was considered as a novel adsorbent for Pb(II) ion. ► SiO2/graphene composite indicated high selectivity and efficiency for the removal of Pb(II) ion. ► The Pb(II) ion adsorption rate of the composite is rapid. ► Potential to be used in the water treatment as an adsorbent for Pb(II) ion.