Defect-enriched (H 2 PO 4 - , Cr 3+ )-α-Fe 2 O 3 /β-In 2 S 3 composites for visible light degradation of 4-nitrophenol.

In this work, the high-activity (HPO, Cr)-α-FeO (PCF) with abundant oxygen vacancies (OVs) and the high specific area was obtained by co-adding HPO and Cr. Defect-enriched PCF/β-InS composites were prepared by low-temperature hydrothermal processes. The prepared composites exhibited improved photocatalytic degradation of 4-nitrophenol under visible light irradiation.The SO bond between PCF and β-InS promoted the formation of tight heterojunction composites and increased the OVs concentration. Under the synergistic effect of photo-Fenton, defects, and heterojunction, the PCF/β-InS composites effectively promoted the separation of photogenerated carriers and accelerated the production of active substances (•OH, •O, O, and h), leading to the improvement of photocatalytic-Fenton degradation performance. This work provided a new strategy for the preparation of highly efficient photocatalysts.