Ag Nanoparticle-Modified Polyoxometalate-Based Metal–Organic Framework for Enhanced CO₂ Photoreduction

Abstract

The photoreduction deposition method is employed to fabricate a family of silver nanoparticle (Ag NP)modified polyoxometalate-based metal−organic framework (NENU-5) photocatalysts, named Ag/NENU-5. The title photocatalysts, Ag/NENU-5, can be used for the photocatalytic reduction of CO 2 and are observed to efficiently reduce CO 2 into CO, in which the highest reduction rate is 22.28 μmol g −1 h −1 , 3 times greater than that of NENU-5. Photocatalytic reduction performances of CO 2 have been extremely improved after the incorporation of Ag NPs as the cocatalyst. The enhancement of the photocatalytic reduction of CO 2 has been attributed to the synergistic effects of Ag NPs and NENU-5, inhibiting the charge recombination during the photocatalytic process and increasing the reaction active sites. Furthermore, the influence of Ag NPs on the photocatalytic activity has also been investigated. The experimental results clearly reveal that the size of Ag NPs could exert a main effect on the photocatalytic activity, and the reasonable size of Ag NPs is able to enhance the photocatalytic reduction activity toward CO 2 significantly.

Polyoxometalate‐Based Frameworks: Construction Strategies and Photocatalytic Applications

“…Meng and colleagues have reported an Ag NP-modified POM-based MOF (Ag/NENU-5), constructed by [PMo 12 O 40 ] 3À , Cu 2 + and 1,3,5-benzenetricarboxylic acid via photoreduction deposition method. [69] The incorporation of Ag NPs into Ag/ NENU-5 as cocatalyst achieved an enhanced photocatalytic activity for CO 2 reduction into CO, compared to the single MOF NENU-5, with the highest reduction rate of 22.28 μmol g À 1 h À 1 . The enhanced of the photocatalytic activity towards CO 2 reduction could be attributed to the synergistic effects of Ag NPs and NENU-5, which effectively suppress charge recombination during the photocatalytic process and promote the generation of reaction active sites.…”

Boosting Antibacterial Photodynamic Therapy in a Nanosized Zr MOF by the Combination of Ag NP Encapsulation and Porphyrin Doping

“…The photoreduction method was used to in situ load Ag NPs into UiO-66-(SH) 2 . , Typically, UiO-66-(SH) 2 (20 mg), ultrapure water (2 mL), ethanol (3 mL), and AgNO 3 aqueous solution (200 μL, 20 mg/mL) were mixed uniformly to obtain a suspension. Argon gas was blown into the suspension to ensure that the air in the solution was fully expelled.…”

Two Polyoxometalate-Encapsulated Two-Fold InterpenetratingdiaMetal–Organic Frameworks for the Detection, Discrimination, and Degradation of Phenolic Pollutants

“…However, because of their discrete molecular cluster structures and high solubility, POMs generally have surface areas of less than 10 m 2 ·g –1 and show low recyclability as photocatalysts, which seriously restrict their application. To overcome these bottlenecks, polyoxometalate-based functional complexes − have been studied and widely used in photocatalysis, electrocatalysis, and other fields. Among various POM-based functional materials, polyoxometalate-based metal–organic frameworks (POMOFs), − which are constructed by introducing POMs as guest molecules into metal–organic framework hosts, have gained the attention of chemists. − Consequently, the surface areas, stability, and conductivity of resulting POMOFs are significantly improved.…”