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Fe 2 O 3  is an especially promising material for water purification as it shows high heavy metal adsorption capacity. However, the high cost of commercial Fe 2 O 3  makes it difficult to be widely used in developing countries. Herein, we probe the heavy metal removal performance of iron oxide rust. Rust was grown on iron nails in a controlled manner using peracetic acid (CH 3 CO 3 H), a safe and environment-friendly oxidizer. Arsenic was selected as an example of a heavy metal contaminant in this study. XRD and EDS analysis revealed that the iron oxide prepared with peracetic acid was nearly amorphous Fe 2 O 3 . Amorphous iron oxide is reported to show higher reactivity than crystalline iron oxide. The BET specific surface area of prepared Fe 2 O 3  is 71 m 2 /g, which is larger than that of commercial Fe 2 O 3 , and the average pore diameter is 73 Å. Oxidized nails are highly effective for removing heavy metals: about 90% of 1ppm arsenic in water was removed at the residence time of 20 minutes, and the removal rate of 90% is maintained after 10 back-to-back arsenic removal experiments at the same residence time. Iron oxide prepared in this study can remove, per 1 cm2, up to 0.114 mg of arsenic.

Characteristics of iron oxide rust prepared by peracetic acid and its removal of heavy metals in water