Fig. 3From: Guar gum-grafted poly(acrylonitrile)-templated silica xerogel: nanoengineered material for lead ion removalSEM image of templated silica xerogel (H900) at magnifications a ×2K and b ×5K. SEM image of Pb2+-loaded templated silica xerogel (H900) at magnifications c ×2K and d ×5KBack to article page