“…Photocatalysts can use visible light to generate photoelectronhole pairs and active radicals (OH, • O 2 − ) or to boost the reductive ferrikinetics in a photo-Fenton system. Considering their respective characteristics, researchers propose various semiconductor-based photo-Fenton systems for effective degradation of refractory environmental contaminants 1,7 Among all the photocatalysts, graphitic carbon nitride (g-C 3 N 4 ), as a nonmetallic conjugated photocatalyst, attracts wide attention owing to its chemical stability, appropriate band gap energy, and unique electronic structure. [13][14][15] However, it is still limited by the low surface area, visible light utilization, blocked charge separation, and low quantum efficiency 16,17 and thus needs further modification.…”