Figure 2From: Coating of magnetite with mercapto modified rice hull ash silica in a one-pot process Formation model of Fe 3 O 4 -SiO 2 -SH from sodium silicate solution; (a) formation of Si-O-Si, (b) formation of Fe-O-Si on magnetite surface, and (c) attachment of mercapto-propyl group on silica coated magnetite. Back to article page