Figure 6From: Coating of magnetite with mercapto modified rice hull ash silica in a one-pot process Structural model of magnetite materials; (a) Fe 3 O 4 - SH, (b) Fe 3 O 4 - SiO 2 , and (c) Fe 3 O 4 -SiO 2 -SH (50:50). Back to article page