Activation of peroxymonosulfate by Co3Sn2 with Co(II)-enriched amorphous layer for efficient removal of RhB pollutant

Abstract

Co3Sn2 with Co(II)-enriched amorphous layer was fabricated through reduction of Sn2+ under hydrothermal conditions. The material exhibited excellent performance for the activation of peroxymonosulfate (PMS) for Rhodamine B (RhB) removal. Almost 100% of RhB was removed using Co3Sn2/PMS within 10 min with an apparent rate constant of kapp = 0.515 min−1, which was higher than other cobalt-based catalysts. This performance of Co3Sn2 is suggested to be a synergistic effect between the Co(II)-layer with abundant active sites and the metallic core with excellent electron conductivity. Several pivotal parameters were investigated. Sulfate radicals and hydroxyl radicals were proven to be major oxidative species.

Keywords

• Co-based catalyst
• Intermetallic compound
• Peroxymonosulfate
• Reaction mechanism
• Rhodamine B