The quality of ecological environment is closely related to human health, however, the emissions of organic dyes, such as rhodamine B (RhB) and methylene blue (MB), produced in textile industries will greatly increase people’s risk of illness and shorten life span. Photocatalysis is an effective and environment-friendly approach for dye degradation, whereas, despite TiO₂ and has emerged as a prospective photocatalyst since its initial use in single-crystal electrodes for water photolysis, the wide band gap restricts its photocatalytic rates greatly. In our research, we incorporated TiO₂ into a Polyoxometalate-Organic Frameworks (POMOFs), specifically {[Ni₆(OH)₃(H₂O)₅(PW₉O₃₄)](1,2,4-Hbtc)}·H₂enMe·5H₂O, to create the composite cluster TiO₂@Ni6-POMOF, in order to narrowing the band gap of TiO₂ and reducing the recombination rates of electron-hole pairs. The composites with 1 wt.%-Ni₆-POMOFs exhibits the best photocatalytic efficiency and achieved high photocatalytic rates in strongly acid environment when it was applied to degrade RhB and MB under 450 nm visible light. The successful integration of POMOFs with TiO₂ not only offers innovative design concepts for photocatalysts with complex structures but also open a new approach for the development of POMOF-catalyst in the future.

Polyoxometalates (POMs), renowned for their robust multielectron transfer capabilities, are utilized as photocatalysts. A Cu&POM based complex comprising H₃PMo₁₂O₄₀ (PMo₁₂) and 1,10-phenanthroline has been structured into a supramolecular framework through hydrogen bonding and π–π interactions. This complex demonstrates exceptional photocatalytic efficacy in the oxidation of toluene and the photodegradation of metronidazole. The oxidation of toluene with Cu-PMo₁₂ achieved a yield and selectivity of 100% under low energy conditions, producing unprecedented results and demonstrating outstanding stability in cycling tests. Photodegradation of metronidazole using Cu-PMo₁₂ achieved a degradation rate of 0.178. This work could facilitate the design and synthesis of novel Cu&POM based complexes with superior photocatalytic activities.