摘要
Biomimetic ZIF-L/MXene were prepared by a facile two-step synthetic route. • Microflower structure favors light harvesting and active site exposure. • MXene can expand the photoresponse into the near-infrared region. • ZIF-L/MX-0.8 achieves efficient photodriven CO2 fixation under ambient conditions. • The photothermal/photocatalytic synergistic mechanism was explored. Solar-driven carbon dioxide (CO 2 ) transformation into valuable carbon-based products is of high significance for simulating natural carbon cycling. However, the ongoing challenge lies in the design of photocatalysts for achieving efficient CO 2 conversion. In this study, inspired by natural wisdom, ZIF-dia/MXene microflowers are successfully constructed through [Zn(NH 3 ) 4 ] 2+ -induced self-assembly of Ti 3 C 2 T x MXene (T x = –F, –OH, =O) sheets followed by the in-situ growth of ZIF-DIA. Remarkably, the optimized ZIF-dia/MX-0.8 serving as a solar-triggered photothermal and photocatalytic bifunctional platform was found to catalyze the coupling of CO 2 and epichlorohydrin, with a cyclic carbonate yield of 98% under full spectrum illumination for 6 h, significantly surpassing the single components. Specifically, the hierarchical flower-like superstructure consisting of ZIF-dia and MXene sheets can favor light absorbance via multiple reflection and facilitate the exposure of active sites and mass transfer. In addition, this ZIF-dia/MXene composite can absorb the light covering the entire visible region owing to the presence of MXene, thereby enhancing the photothermal conversion. Furthermore, experimental results reveal that the CO 2 cycloaddition with epoxide over ZIF-dia/MX-0.8 is proved to be the synergy of photothermal catalysis and photocatalysis. This work enriches the design of MOF-containing photocatalysts, opening a unique and sustainable way to solve global environmental issues. Download: Download high-res image (165KB) Download: Download full-size image
危险品化学品经营许可证（带存储）