Issue 24, 2023

Modulating oxygen vacancy concentration on Bi4V2O11 nanorods for synergistic photo-driven plastic waste oxidation and CO2 reduction

Abstract

Sunlight-driven CO2 reduction coupled with photo-oxidation of plastic waste into value-added chemicals is a very attractive approach towards solving the greenhouse and environmental crisis. Herein, Bi4V2O11 nanorods with regulable O-vacancy concentration have been synthesized by the solvothermal method, aiming to provide abundant active sites for CO2 adsorption and boost the separation of photogenerated carriers. In a dual-function system, gas production (CO) mainly from the CO2 reduction-half-reaction reaches 64.7 μmol g−1 h−1 on Bi4V2O11 with rich oxygen vacancies (VO-BVO-15) in PET hydrolysis solution under 300 W Xe lamp irradiation, 24.5-fold higher than that in 2 M KOH solution. Moreover, a considerable amount of HCOOH product with a conversion rate of 0.7 mmol gcata.−1 is also achieved under 5 h of irradiation. Glyoxal (6.9 mmol gcata.−1) and glyoxylate (3.2 mmol gcata.−1) are produced mainly from the PET oxidation-half-reaction. This work presents an in-depth study of the development of Bi–O–V photocatalysts through defect engineering for photocatalytic CO2 reduction and demonstrates a promising strategy for reuse of plastic waste and realizing carbon cycle with low energy consumption.

Graphical abstract: Modulating oxygen vacancy concentration on Bi4V2O11 nanorods for synergistic photo-driven plastic waste oxidation and CO2 reduction

Supplementary files

Article information

Article type
Paper
Submitted
30 11 2022
Accepted
10 1 2023
First published
10 1 2023

J. Mater. Chem. A, 2023,11, 12770-12776

Modulating oxygen vacancy concentration on Bi4V2O11 nanorods for synergistic photo-driven plastic waste oxidation and CO2 reduction

M. Liu, Y. Xia, W. Zhao, R. Jiang, X. Fu, B. Zimmerle, L. Tian and X. Chen, J. Mater. Chem. A, 2023, 11, 12770 DOI: 10.1039/D2TA09345F

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