Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (6): 1361-1367.doi: 10.1007/s40242-022-2292-6

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MxCo3O4/g-C3N4 Derived from Bimetallic MOFs/g-C3N4 Composites for Styrene Epoxidation by Synergistic Photothermal Catalysis

REN Fengdi, GAO Qiqin, CHEN Yuzhen   

  1. Department of Chemistry, College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, P. R. China
  • Received:2022-09-26 Online:2022-12-01 Published:2022-12-06
  • Contact: CHEN Yuzhen E-mail:chenzhen1738@163.com
  • Supported by:
    This work was supported by the Excellent Youth Foundation of Shandong Natural Science Foundation, China(No.ZR2020YQ08), the National Natural Science Foundation of China(No.22275108) and the Key Research and Development Program of Shandong Province, China(No.2019GGX103043).

Abstract: Although metal-organic frameworks(MOFs) have been widely reported as precursors for obtaining various porous materials in recent years, the limited MOF types and monofunctional active site of MOF-based catalysts remain to be hard to crack. Herein, bimetallic MOFs, MCo-ZIFs stabilized by graphitized carbon nitride(g-C3N4) and their pyrolytic MxCo3O4/g-C3N4 hybrids(M=Zn, Cu, Fe, Ni) have been designedly synthesized. The obtained MxCo3O4/g-C3N4 hybrids display synergistic photothermal effect from both MxCo3O4 and g-C3N4 under visible light irradiation. Significantly, the solution temperature can be heated from room temperature(20℃) to 66℃ after 40 min irradiation. Therefore, the catalytic activity of MxCo3O4/g-C3N4 exceeds those of most reported catalysts under mild reaction conditions. The optimal ZnxCo3O4/g-C3N4 catalyst realizes 96% conversion and 75% selectivity toward styrene oxide within 20 min. Incredibly, the CuxCo3O4/g-C3N4 could achieve up to 89% selectivity toward styrene oxide. To our knowledge, this is the first report about the novel photothermal effect of ZIFs-derived metal oxides.

Key words: Metal-organic framework, Pyrolysis, Photothermal effect, Styrene epoxidation