Graphene oxide modified UiO-66-NH2/COF for promoting photocatalytic H2 evolution

Metal organic frameworks/covalent organic frameworks (MOFs/COFs) heterojunction structures present prospect for photocatalytic H2 evolution (PHE), but still limited and restrictive. Herein, we propose the modification of UiO-66-NH2/4,4′,4″-(1,3,5-triazine-2,4,6-triyl) trianiline-2,4,6-triformylphloroglucinol-COF (UiO-66-NH2/TAPT-TP-COF) by graphene oxide (GO) to improve its photocatalytic activity. The ternary photocatalyst was synthesized by hydrothermal method. An optimized photocatalytic H2 evolute rate of 13.7 mmol·g−1·h−1 was achieved over UiO-66-NH2/TAPT-TP-COF/GO-0.5 %, which increased by 4.9 mmol·g−1·h−1 as compared to the highly active UiO-66-NH2/TAPT-TP-COF. The improvement of photocatalytic activity was attributed to the interfacial contact between GO and UiO-66-NH2 so that GO was able to accept electrons from the surface of MOF and act as the electron receiver to promote the separation of photogenerated charges. This work contributes to the development of high-efficiency MOF/COF-based composite materials as photocatalyst.