Catalyst and a wastewater treatment method

A catalyst comprising an amorphous metallic glass matrix;

• and a surface layer including a cover layer and an amorphous interlayer, wherein the surface layer covers the amorphous metallic glass matrix and the cover layer comprises a porous structure having porous channels sized to permit a persulfate or peroxymonosulfate to pass therethrough so as to contact the amorphous interlayer whereby, upon contact, a catalytic reaction transforms a portion of the amorphous interlayer into the porous structure of the cover layer, and wherein the portion transformed is transformed from an amorphous phase to a nanocrystalline phase;
• and
• wherein the atomic component of the amorphous metallic glass matrix consists essentially of:
• iron:
• 60-85%;
• silicon:
• 0-20%:
• boron:
• 0-20%:
• phosphorus:
• 1-20%;
• and
• carbon:
• 0-10%.