研究目的
To develop a facile supramolecular electrostatic self-assembly strategy for fabricating mesoporous thin-walled g-C3N4 microtubes (mtw-CNT) to enhance photocatalytic activities for H2 production and CO2 reduction under visible light irradiation.
研究成果
The mesoporous thin-walled g-C3N4 microtubes (mtw-CNT) fabricated via a supramolecular electrostatic self-assembly strategy exhibit excellent photocatalytic performance towards H2 production and CO2 reduction under visible light irradiation. The unique structure enhances specific surface area, optical absorption, and charge carrier separation, leading to high photocatalytic activity and selectivity.
研究不足
The study focuses on the synthesis and photocatalytic performance of mtw-CNT under visible light irradiation. The scalability of the synthesis method and the long-term stability under practical conditions are not extensively discussed.
1：Experimental Design and Method Selection:
A supramolecular electrostatic self-assembly strategy was developed to fabricate mesoporous thin-walled g-C3N4 microtubes (mtw-CNT) without any additional soft-/hard-templates or organic solvents.
2：Sample Selection and Data Sources:
Melamine was used as the precursor, and the morphology was controlled by adjusting the pH during hydrothermal treatment.
3：List of Experimental Equipment and Materials:
Materials included melamine, cyanamide, SiO2 colloidal suspension, NH4HF2, urea, Na2SO4, N,N-dimethylformamide, Nafion solution, hydrogen hexachloroplatinate (IV), bipyridine, acetonitrile, triethanolamine, and cobalt (II) chloride hexahydrate. Equipment included thermogravimetric analyzer, X-ray powder diffractometer, scanning electron microscopy, transmission electron microscopy, atomic force microscopy, Fourier transform infrared spectrometer, X-ray photoelectron spectrometer, UV-vis spectrometer, and photoluminescence spectrometer.
4：Experimental Procedures and Operational Workflow:
The process involved hydrothermal treatment of melamine at different pH to form precursors, electrostatic self-assembly to form tubular structures, and thermal treatment to obtain mtw-CNT.
5：Data Analysis Methods:
The photocatalytic activities were evaluated by measuring H2 evolution and CO2 reduction under visible light irradiation, and the materials were characterized by various spectroscopic and microscopic techniques.
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SiO2 colloidal suspension
Ludox HS40
Aldrich
Template for the synthesis of mesoporous g-C3N4
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Nafion solution
5 wt%
Aldrich
Used to prepare the working electrode
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Hydrogen hexachloroplatinate (IV)
~38% Pt basis
Aldrich
Cocatalyst for photocatalytic H2 production
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Melamine
Aldrich
Precursor for the synthesis of g-C3N4
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Cyanamide
Aldrich
Used in the preparation of mesoporous g-C3N4
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NH4HF2
Sinopharm
Used to remove the silica template
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Urea
Sigma-Aldrich
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Na2SO4
Sinopharm
Electrolyte for electrochemical measurements
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N,N-dimethylformamide
Sinopharm
Solvent for preparing the working electrode
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Bipyridine
Aldrich
Used in photocatalytic CO2 reduction
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Acetonitrile
Sigma-Aldrich
Solvent for photocatalytic CO2 reduction
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Triethanolamine
Aldrich
Sacrificial agent for photocatalytic H2 production
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Cobalt (II) chloride hexahydrate
Sigma-Aldrich
Cocatalyst for photocatalytic CO2 reduction
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