Figure 9From: Coating of magnetite with mercapto modified rice hull ash silica in a one-pot process The amount of Fe dissolved in 2 M HCl within 5 days from magnetite materials; (a) Fe 3 O 4 -SiO 2 -SH(25:75), (b) Fe 3 O 4 - SiO 2 -SH(75:25), (c) Fe 3 O 4 -SiO 2 -SH(50: 50), (d) Fe 3 O 4 -SiO 2 and (e) Fe 3 O 4 -SH. Back to article page