Rapid photocatalytic reduction of hexavalent chromium over Z-scheme MgInS/BiPO heterojunction: Performance, DFT calculation and mechanism insight.

The accumulation of highly fluid and biotoxic hexavalent chromium (Cr(VI)) impairs water ecosystems. It is urgent to quickly reduce Cr (VI) to trivalent chromium (Cr (III)) in wastewater. Hereby, Z-scheme MgInS/BiPO heterojunction was prepared, and MB-30 (mass ratio of BiPO to composite) presented a rapid Cr(VI) (10 mg L) removal efficiency of 100% within 10 min, its kinetic rate constant was 9.