The photocatalytic reduction technology was utilized to eliminate UO22+ pollutant.
Sulfur-doped g-C3N4 (S-g-C3N4) was used as photocatalyst for the removal of UO22+.
Doping sulfur to replace nitrogen modified the electronic structures of g-C3N4.
S-g-C3N4 shows high performance in the photocatalytic reduction of UO22+.
The good activity of S-g-C3N4 was explored both experimentally and theoretically.