Novel visible light induced Co3O4-g-C3N4 heterojunction photocatalysts for efficient degradation of methyl orange

- Co3O4-g-C3N4 heterojunction photocatalysts were synthesized via a facile method.
- The Co3O4-g-C3N4 shows significantly enhanced photocatalytic activity.
- The Co3O4-g-C3N4 has higher concentration of superoxide radicals (O2−).
- The intimate interfaces promote the charge transfer and separation.