Covalent organic framework with sulfonic acid functional groups for visible light-driven CO2 reduction

Wanrong Li; Qian Wang; Fuzhi Cui; Guofang Jiang

doi:10.1039/d2ra02660k

Covalent organic framework with sulfonic acid functional groups for visible light-driven CO₂ reduction

RSC Adv. 2022 Jun 17;12(28):17984-17989. doi: 10.1039/d2ra02660k. eCollection 2022 Jun 14.

Authors

Wanrong Li¹, Qian Wang¹, Fuzhi Cui¹, Guofang Jiang¹

Affiliation

¹ College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, Hunan University Changsha 410082 P. R. China guofangjiang@hnu.edu.cn.

Abstract

In this study, a covalent organic framework (TpPa-SO₃H) photocatalyst with sulfonic acid function groups was synthesized using a solvothermal method. The morphologies and structural properties of the as-prepared composites were characterized by X-ray diffraction, infrared spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, N₂ adsorption-desorption measurements, and field emission scanning electron microscopy. An electrochemical workstation was used to test the photoelectric performance of the materials. The results show that TpPa-SO₃H has -SO₃H functional groups and high photocatalytic performance for CO₂ reduction. After 4 h of visible-light irradiation, the amount of CO produced is 416.61 μmol g^-1. In addition, the TpPa-SO₃H photocatalyst exhibited chemical stability and reusability. After two testing cycles under visible light irradiation, the amount of CO produced decreased slightly to 415.23 and 409.15 μmol g^-1. The XRD spectra of TpPa-SO₃H were consistent before and after the cycles. Therefore, TpPa-SO₃H exhibited good photocatalytic activity. This is because the introduction of -SO₃H narrows the bandgap of TpPa-SO₃H, which enhances the visible light response range and greatly promotes the separation of photogenerated electrons.