Volume 40 Issue 3
Mar.  2023
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Article Contents
MA Mengdan, ZHOU Anning, DUAN Feiyang, et al. Preparation of Ti1Li3Al2-LDHs/g-C3N4 composites and its photocatalytic properties in CO2-toluene reaction system[J]. Acta Materiae Compositae Sinica, 2023, 40(3): 1522-1533. doi: 10.13801/j.cnki.fhclxb.20220510.001
Citation: MA Mengdan, ZHOU Anning, DUAN Feiyang, et al. Preparation of Ti1Li3Al2-LDHs/g-C3N4 composites and its photocatalytic properties in CO2-toluene reaction system[J]. Acta Materiae Compositae Sinica, 2023, 40(3): 1522-1533. doi: 10.13801/j.cnki.fhclxb.20220510.001

Preparation of Ti1Li3Al2-LDHs/g-C3N4 composites and its photocatalytic properties in CO2-toluene reaction system

doi: 10.13801/j.cnki.fhclxb.20220510.001
Funds:  National Natural Science Foundation of China (51674194)
  • Received Date: 2022-03-02
  • Accepted Date: 2022-04-23
  • Rev Recd Date: 2022-04-11
  • Available Online: 2022-05-10
  • Publish Date: 2023-03-15
  • Photocataltyic reduction of CO2 is one of the promising routes in CO2 conversion and utilization, but the very low CO2 conversion rate is the biggest hurdle for the process. Developing a new CO2 reduction reaction system and improving the visible light utilization and separation efficiency of photogenerated electrons and holes are effective ways to solve the above problems. In this work, we designed a CO2-toluene coupling reaction system to promote the CO2 reduction reaction. The Ti1Li3Al2-layered dihydroxides (LDHs)/graphite phase carbon nitride (g-C3N4) composite with heterojunction structure were synthesized by electrostatic assembly method. And the photoelectric property and photocatalytic properties of Ti1Li3Al2-LDHs/g-C3N4 composite were explored in CO2-toluene reduction reaction system. The results show that CO2 is reduced to CO, and toluene is oxidized to benzyl alcohol, benzaldehyde and benzyl benzoate in the photocataltyic coupling reaction system. Benzaldehyde and benzyl alcohol content can reach 4.80 and 4.70 mmol/gcat. This is mainly because the g-C3N4 can extend the absorption of Ti1Li3Al2-LDHs from the ultraviolet region to the visible region, and improve the dispersion of Ti1Li3Al2-LDHs which provide more active sites for photocatalytic reactions. Moreover, the S-type heterojunction is formed in the interface of Ti1Li3Al2-LDHs/g-C3N4, which is conducive to the transfer of photogenerated electrons at the interface and improves the separation efficiency of photogenerated electrons and holes. And toluene can be used as an organic substrate to accelerate the rate of hole consumption and stimulate the CO2 reduction reaction. This work provides a new idea for the synergistic reaction between CO2 reduction and small molecular organics.


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