High efficiency removal of dissolved As(III) using iron nanoparticle-embedded macroporous polymer composites

► Gels prepared by cryopolymerisation techniques are excellent materials for use as supports for nanoparticles. ► Nanoparticle composite gels act as adsorption / filtration devices for clean-up of waters. ► Iron oxide nanoparticle: gel composites are effective in the removal of arsenic (III).