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The conversion of CO 2 into useful chemicals via photocatalysts is a promising strategy for resolving the environmental problems caused by the addition of CO 2 . Herein, a series of composite photocatalysts MOP@TpPa-CH 3 based on MOP-NH 2 and TpPa-CH 3 through covalent bridging have been prepared via a facile room-temperature evaporation method and employed for photocatalytic CO 2 reduction. The photocatalytic performances of MOP@TpPa-CH 3 are greater than those of TpPa-CH 3 and MOP-NH 2 , where the CO generation rate of MOP@TpPa-CH 3 under 10% CO 2 still reaches 119.25 μmol g -1 h -1 , which is 2.18 times higher than that under pure CO 2 (54.74 μmol g -1 h -1 ). To investigate the structural factors affecting the photocatalytic activity, MOP@TBPa-CH 3 without C═O groups is synthesized, and the photoreduction performance is also evaluated. The controlling experimental results demonstrate that the excellent photoreduction CO 2 performance of MOP@TpPa-CH 3 in a 10% CO 2 atmosphere is due to the presence of C═O groups in TpPa-CH 3 . This work offers a new design and construction strategy for novel MOP@COF composites.

Metal-organic frameworks constructed from Zr usually possess excellent chemical and physical stability. Therefore, they have become attractive platforms in various fields. In this work, two families of hybrid materials based on ZrSQU have been designed and synthesized, named Im@ZrSQU and Cu@ZrSQU, respectively. Im@ZrSQU was prepared through the impregnation method and employed for proton conduction. Im@ZrSQU exhibited terrific proton conduction performance in an anhydrous environment, with the highest proton conduction value of 3.6 × 10 -2 S cm -1 at 110 °C. In addition, Cu@ZrSQU was synthesized via the photoinduction method for the photoreduction of CO 2 , which successfully promoted the conversion of CO 2 into CO and achieved the CO generation rate of up to 12.4 μmol g -1 h -1 . The photocatalytic performance of Cu@ZrSQU is derived from the synergistic effect of Cu NPs and ZrSQU. Based on an in-depth study and discussion toward ZrSQU, we provide a versatile platform with applications in the field of proton conduction and photocatalysis, which will guide researchers in their further studies.

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.