ZIF-67/BiOCl Z-Scheme Heterojunction Photocatalyst for Photodegradation of Organic Dyes and Antibiotics

Abstract

Z-scheme heterojunction photocatalysts with excellent redox capability show great potential in the field of environmental remediation. In this research, ZIF-67 and BiOCl were used to construct metal–organic framework (MOF)-based heterostructures, which effectively achieved 97.4% rhodamine B (RhB) degradation and 78.2% tetracycline (TC) degradation under visible light irradiation. The cyclic experiments displayed that 15% ZIF-67/BiOCl remained structurally stable after 4 cycles. Reactive species trapping demonstrates that 1O2 and ·O2 – were mainly responsible for RhB and TC degradation, which were inoculated with EPR results. This work also reveals the degradation path and mechanism of heterojunction, which provides insight into the synthesis of superior photocatalysts for environmental remediation.

Heterostructured Photocatalytic Fabric Composed of Ag3PO4 Nanoparticle-Decorated NH2-MIL-88B (Co/Fe) Crystalline Wires for Rhodamine B Adsorption and Degradation

“…Overall, the heterojunction photocatalytic fabrics demonstrated improved photocatalytic performance compared to single catalytic fabric, which is well aligned with the results of previous catalytic studies. ,,− Additionally, the up-shifted position of (CB) for MIL 0.15 (−0.43 eV) and MIL 0.2 (−0.58 eV) compared to MIL 0 (−0.08 eV) led to the improved photocatalytic performance due to the facilitated O 2 /•O 2 – conversion. The results demonstrate that both adsorption and photocatalytic performance can be improved by manipulating the bimetallic ratio of MIL x in a heterojunction system.…”

“…The RhB molecules are attacked by h + and these reactive oxygen species (•OH – , •O 2 – ) (eq ). Those active species proceed the photocatalytic degradation. , …”

“…More importantly, the CB position of MIL 0 is higher than the reducing potential of Those active species proceed the photocatalytic degradation. 60,62 As a result, the construction of a heterojunction with bimetal MIL x up to a Co/Fe ratio of 0.2 not only enhanced the charge separation ability but also increased the redox power, ultimately leading to an effective catalytic reaction. When the •O 2 − radical scavenger was added, the RhB removal performance was decreased in the order of Ag/MIL 0.2 @C (76.2%) > Ag/MIL 0.15 @C (75.5%) > Ag/MIL 0.1 @C (64.8%) > Ag/MIL 0 @C (61.6%).…”

Construction of type II ZnBi2O4/g-C3N4 heterojunction photocatalysts for efficient degradation of acid red B

“…Since the valence band potential of ZnBi 2 O 4 is more negative than that of H 2 O/˙OH (2.27 eV), 37 it cannot produce ˙OH. The conduction band potential of ZnBi 2 O 4 is more negative than that of g-C 3 N 4 , and electrons from ZnBi 2 O 4 will migrate to the conduction band of g-C 3 N 4 , which is more negative than that of O 2 /˙O 2 − (−0.33 eV), 60 so the conduction band electrons react with the oxygen adsorbed on the surface of the composite catalyst to form ˙O 2 − , and the resulting ˙O 2 − has a strong oxidizing ability for acid red B, which eventually decomposes acid red B mineralization to CO 2 , H 2 O and other small molecules. This shows that the conventional type II heterojunction improves the photogenerated carrier migration efficiency and suppresses the electron–hole complexation, which further improves the photocatalytic activity.…”