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Study on preparation of g-C3N4/polyaniline composites and their application in photocatalytic reduction of CO2
Received date: 2024-08-05
Online published: 2024-09-09
The g-C3N4/PANI composite was prepared by coupling the photocatalytic material graphite carbon nitride（g-C3N4） and the conductive polymer polyaniline（PANI） by constructing a heterojunction strategy.The morphology，elemental composition and photoelectrochemical properties of the composites were characterized and evaluated by X-ray diffraction（XRD），Fourier transform infrared spectroscopy（FT-IR），X-ray photoelectron spectroscopy（XPS），scanning electron microscopy（SEM），UV-vis diffuse reflectance spectroscopy（UV-vis DRS），steady-state/transient photoluminescence spectroscopy（PL and TRPL），transient photocurrent spectroscopy（TPC） and electrochemical impedance spectroscopy（EIS）.The results showed that the structure of g-C3N4/PANI composites was PANI uniformly covered on the surface of g-C3N4，and there was a heterojunction structure between g-C3N4 and PANI.After coated by PANI，the specific surface area of g-C3N4 was significantly increased from 21.31 to 66.13 m2/g，an increase of about 2.10 times，which effectively improved the photocatalytic performance.By optimizing the amount of PANI，the g-C3N4/PANI（3%） composite exhibited the best visible light photocatalytic reduction of CO2 performance，and the space-time yield of CH3OH reached 3.12 μmol/（g·h），which was 4.27 times that of pure g-C3N4.The construction of heterojunction broadened the spectral response range of g-C3N4/PANI（3%） composites in the visible light region，effectively promoted the separation of photogenerated carriers，significantly reduced the AC impedance，and significantly improved the charge transfer rate，thereby significantly improving the photocatalytic reduction of CO2 performance.Gas chromatography analysis showed that the main product of the reaction was CH3OH，accompanied by a small amount of CO formation，which confirmed that the g-C3N4/PANI（3%） composite had good selectivity as a catalyst.After 5 cycles，the space-time yield of CH3OH was still higher than 2.97 μmol/（g·h），and the activity was maintained above 95%.Finally，the spuce-time energy band structure was obtained by valence band-X-ray photoelectron spectroscopy（VB-XPS） characterization and Mott-Schottky curve analysis.The visible light photocatalytic reduction of CO2 by g-C3N4/PANI composites followed the Type-Ⅱ mechanism.
Key words： photocatalysis; CO2 reduction; heterojunction; composite materials; carbon nitride
SHEN Mengmeng . Study on preparation of g-C3N4/polyaniline composites and their application in photocatalytic reduction of CO2[J]. Inorganic Chemicals Industry, 2025 , 57(8) : 123 -130 . DOI: 10.19964/j.issn.1006-4990.2024-0438
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