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. 2023 Jan 14;8(4):4072-4080.
doi: 10.1021/acsomega.2c07010. eCollection 2023 Jan 31.

Nanoarchitecture of a Two-Dimensional Few-Layer Graphene Oxide/π-Conjugated Polyimide Composite for Enhanced Photocatalytic Performance

Zhiang Luo  1 , Duoping Zhang  1 , Chenghai Ma  1 , Meitong Zhu  1 , Binhao Li  1 , Laidi Song  1 , Shiqi Yang  1
Affiliations

Nanoarchitecture of a Two-Dimensional Few-Layer Graphene Oxide/π-Conjugated Polyimide Composite for Enhanced Photocatalytic Performance

Zhiang Luo et al. ACS Omega. .

Abstract

A novel two-dimensional graphene oxide/sulfur-doped polyimide (GO/SPI) hybrid polymer photocatalyst was synthesized by a facile ultrasonic chemical method. The characterization results showed that the skeleton structure of SPI was not changed when the few layers of GO were wrapped on the surface. Due to the excellent charge transport characteristics of GO and the strong π-π stacking interaction between two-dimensional GO and SPI, the photogenerated carrier transport capability of the GO/SPI composites was significantly enhanced compared with that of SPI. The efficient transmission and separation of photogenerated charge carriers significantly improve the photocatalytic degradation of the methyl orange activity of the GO/SPI composite. This work provides a facile and new way for the synthesis of metal-free inorganic-organic composite photocatalysts with high efficiency and low cost.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Scheme 1
Scheme 1. Synthesis of SPI by Polymerization of MA and PMDA at 325 °C
Figure 1
Figure 1
XRD patterns of GO, SPI, and the GO/SPI composite powder samples.
Figure 2
Figure 2
Images of SEM (a–c) and TEM (d–f) for GO, SPI, and the 2GO/SPI composite. (g) EDX elemental mappings of C, N, O, and S for the 2GO/SPI sample.
Figure 3
Figure 3
FT-IR spectra of GO, SPI, and the GO/SPI composite powder samples.
Figure 4
Figure 4
(a) XPS survey, (b) C 1s and (c) O 1s XPS spectra of SPI, GO, and the 2GO/SPI composite. (d) N 1s XPS spectra of GO, SPI, and the 2GO/SPI composite.
Figure 5
Figure 5
(a) BET surface area isotherms. (b) BJH plot for pore size distribution of SPI and the 2GO/SPI composites.
Figure 6
Figure 6
(a) UV–vis diffuse reflectance spectroscopy spectra of the as-prepared pure SPI and the GO/SPI composites. (b) Corresponding plots of (αhν)2 vs hν. (c) VBXPS spectra. (d) Schematic illustration of band structures for SPI and GO.
Figure 7
Figure 7
(a) Photocatalytic activities of the MO degradation on GO, SPI, and GO/SPI with different GO contents under visible light irradiation. (b) Kinetic constants of MO degradation with different systems. (c) The calculated corresponding k of different systems. (d) Cycling runs for the photodegradation of MO in the presence of the 2GO/SPI composite sample.
Figure 8
Figure 8
Comparison of photoluminescence spectra of the SPI, 2GO/SPI, and GO samples.
Figure 9
Figure 9
(a) Transient photocurrent response and (b) Nyquist plots of EIS for SPI and 2GO/SPI samples in a 0. 5 M Na2SO4 aqueous solution.
Figure 10
Figure 10
Schematic of the photogenerated charge carrier’s separation and transfer in the GO/SPI composite under visible light irradiation.
See this image and copyright information in PMC

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