PEI-grafted magnetic porous powder for highly effective adsorption of heavy metal ions

Removal of zinc and lead from aqueous solution by nanostructured cedar leaf ash as biosorbent

“…The maximum adsorption of Zn 2+ and Pb 2+ by nanostructured cedar leaf ash occurred at pH 5 for both metals. Similar results have been reported by other researchers who indicated that adsorption efficiency of adsorbents was low at acidic pH and increases at higher pH values [48]. It can be explained by the fact that at low pH, there are H + ions in the solution which compete with Zn 2+ and Pb 2+ ions for active sites present on the nanostructured cedar leaf ash.…”

Magnetic adsorbents for the treatment of water/wastewater—A review

“…Thus the interaction was weak and bound metal ion could be easily recovered from the magnetic resin. Pang et al [159] grafted PEI on a magnetic powder composed of SiO 2 and Fe 3 O 4 to form a magnetic adsorbent for the removal of Cu(II), Zn(II) and Cd(II) from aqueous phase. Maximum removal was observed at pH 6.5 with the adsorbent showing preferential adsorption in the order Cu(II) > Zn(II) > Cd(II).…”

One-step synthesis of CDTA coated magnetic nanoparticles for selective removal of Cu(II) from aqueous solution

“…However, excessive amount of copper can cause abnormal metabolism [1]. Due to these reasons, the accurate and precise determinations of copper ion are important for analytical chemists [2,3].…”