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The anhydrous proton conductivity of Im@IEF-11 resulting from the integration of imidazole and porous IEF-11 has been investigated, and the highest proton conductive value can reach up to 7.64 × 10 -2 S cm -1 . Furthermore, IEF-11 is also developed to reduce CO 2 due to its reasonable structure and suitable energy band, and its CO formation rate is 31.86 μmol g -1 h -1 .

A family of heterojunction photocatalysts C 60 /TpPa have been constructed from fullerenes (C 60) and TpPa-1 via in-situ solvothermal method firstly. The photocatalytic activity toward CO 2 of C 60 /TpPa has been evaluated through the gas-solid reaction system under pure CO 2 and low concentration CO 2 (10 %) atmosphere, respectively. The results show that the maximum CO formation rates for C 60 /TpPa are as high as 48.16 μmol·g−1·h−1 and 90.25 μmol·g−1·h−1 under pure CO 2 and 10 % CO 2 environment, respectively. The attractive experimental phenomenon is assigned to the existence of C O groups in TpPa-1. Due to the presence of Z-scheme heterojunction, the separation of photoexcited electrons and holes is effectively enhanced, and the photocatalytic performances are significantly improved. This work suggests that the construction of COF-based photocatalysts with heterojunction for efficient photoreduction of CO 2 is a promising strategy. [Display omitted] • It is the first work that combining C 60 with TpPa-1 build Z-scheme heterojunction photocatalysts. • Due to the presence of C O groups, C 60 /COF achieve higher performance in 10 % CO 2 environment. • Z-scheme heterojunction enhances the performances by improving the efficient separation of photo-excited electrons and holes. [ABSTRACT FROM AUTHOR]

• MOF/COF hybrid photocatalysts are prepared through the simple grinding method. • TpPa/ZIF-8 photocatalysts exhibit excellent performances in pure and diluted CO 2. • The role of –OH groups on photocatalytic performances is proposed and verified. It remains challenging to design and synthesize porous crystalline photocatalysts for photocatalytic reduction CO 2 with high efficiency. Herein, a Schiff-based covalent organic framework (TpPa-1) is explored to combine with a metal–organic framework (ZIF-8) via a simple and fast method (the grinding method) firstly, generating a series of photocatalysts TpPa/ZIF-8. The photocatalytic performances of the as-synthesized photocatalysts TpPa/ZIF-8 are evaluated through a gas–solid reaction mode without photosensitizers and sacrificial agents, exhibiting excellent photocatalytic activities toward CO 2 in pure CO 2 and 10% CO 2 atmosphere, especially in 10% CO 2 environment. Therefore, the experimental result presents that TpPa/ZIF-8 can obtain the CO formation rates of 43.94 μmol·g−1·h−1 at a pure CO 2 environment and 84.87 μmol·g−1·h−1 in 10% CO 2 atmosphere, approximately 2 times and about 6 times larger than those of TpPa-1 in the pure CO 2 and 10% CO 2 atmosphere, respectively. The interesting phenomenon inspires us to investigate the structural factors affecting the photocatalytic activity, and hydroxyl groups from TpPa-1 are suspected to play an important role in the significantly improved photoreduction performance of CO 2 in 10% CO 2 atmosphere. The controlling examples TFPa/ZIF-8 without hydroxyl groups have also been prepared and evaluated their photoreduction performances in order to validate this hypothesis. The results clearly prove the hydroxyl groups tend to enhance CO 2 photoreduction. Additionally, it is noted that TpPa/ZIF-8 could maintain certain photocatalytic activity under the irradiation of sunlight. Summarily, the superior photocatalytic performances of TpPa/ZIF-8 may result from the high charge separation efficiency and increased photocatalytic active sites as well as the CO 2 adsorption capacity. The reported work sheds light on the construction of MOFs/COFs hybrid materials and expands their applications. [ABSTRACT FROM AUTHOR]