In-Situ Synthesis of Α-Fe2o3/Lafeo3 Modified with G-C3n4 and Ti3c2 for Construction of Multiple Z-Scheme/Schottky Heterojunctions as an Efficient Visible Light Photocatalyst for Cr (Vi) Reduction and Organic Pollutants Removal

Herein, in-situ synthesis of nonstoichiometric α-Fe2O3/LaFeO3 compounded with g-C3N4 and Ti3C2 MXene to form multiple Z-scheme/Schottky heterojunctions, α-Fe2O3/LaFeO3/g-C3N4/Ti3C2 (FLCT), is reported. In the FLCT, α-Fe2O3/LaFeO3 could promote carrier migration, g-C3N4 caused electrons to move directionally toward Ti3C2, inhibiting the carrier complex, and Ti3C2 substitution of a noble metal could provide more adsorption active sites and promote carrier separation. Therefore, the synergistic effect of the multiple Z-scheme/Schottky heterojunctions allowed the FLCT composite to exhibit an excellent photocatalytic performance. To demonstrate the extensive applicability of the composite materials in the photocatalytic degradation and reduction of wastewater, methylene blue (MB), rhodamine B (Rh B), tetracycline hydrochloride (TC), and hexavalent chromium ions (Cr (VI)) were used as pollutant models. 91.30% of the MB, 84.32% of the Rh B, and 76.11% of the TC were photocatalytic degraded, and 79.60% of the Cr (VI) was photocatalytically reduced by the FLCT. The results showed that the composite catalyst exhibited photocatalytic degradation efficiencies that were 3.41, 3.86, 5.44, and 4.14 times those of pure LaFeO3 for MB, Rh B, TC, and Cr (VI), respectively. The intrinsic relationship between the composite structure and the photocatalytic performance was investigated, the enhancement mechanism of the composite photocatalytic performance was revealed, and the charge migration path and pollutant degradation mechanism in the photocatalytic system were elucidated. This work provides a novel concept for designing heterojunction-structured photocatalysts and provides an experimental foundation for photocatalytic technology to achieve water pollution treatment