article · Fuel
A binary nanocomposite combining graphitic carbon nitride and an amino-functionalised titanium metal-organic framework was fabricated using a sonochemical-assisted thermal method. This material forms a Z-scheme heterojunction that boosts visible light absorption and improves charge carrier separation. Tested under visible light, the composite enhanced hydrogen generation and the reduction of carbon dioxide into carbon monoxide and methane. The material containing twenty weight percent metal-organic framework achieved peak yields of 480 micromoles per gram for hydrogen and 338 micromoles per gram for carbon monoxide. Pure graphitic carbon nitride yielded the most methane, showing that the metal-organic framework favours carbon monoxide production. Methanol served as the most effective sacrificial agent, and higher pressure improved carbon dioxide conversion. Across multiple cycles, the catalyst maintained stable production without notable deactivation.
Converting solar energy into clean fuels like hydrogen while recycling carbon dioxide into useful chemicals presents an attractive pathway for clean energy generation. By enhancing light absorption and catalytic stability using an easily synthesised nanocomposite, this approach demonstrates how modified nanomaterials can simultaneously tackle renewable energy production and greenhouse gas reduction under visible light.
This work demonstrates an early-stage laboratory method for producing green hydrogen and recycling carbon dioxide into industrial gases like carbon monoxide. Potential users include developers of photocatalytic systems and solar fuel technologies. The technology is at an early experimental stage, having been evaluated only in bench-scale batch tests, meaning substantial scale-up, continuous-flow reactor testing, and economic analysis are required before any real-world deployment.
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A binary g-C3N4/NH2-MIL-125(Ti) MOF nanocomposite was fabricated through a facile sonochemical-assisted thermal approach for enhanced photocatalytic H2 production and CO2 reduction under visible light. Compared to pure g-C3N4, the g-C3N4/MOF photocatalyst showed enhanced visible light absorption with promoted charge carrier separation which increased the H2 production rate and the CO2 reduction into CH4 and CO. This enhancement was attributed to the successfully constructed Z-scheme heterojunction in addition to the visible-active, large surface area and highly CO2 adsorbable NH2-MIL-125(Ti) MOF. The highest H2 production of 480 µmol g−1 was exhibited over the g-C3N4/NH2-MIL-125(Ti) nanocomposite with 20 wt% MOF. Similarly, the highest CO production rate of 338 µmol g−1 was achieved with 20 wt% MOF composite. However, for the CH4 product gas, it was observed that the highest production rate was attained with pure g-C3N4 which reveals the NH2-MIL-125(Ti) MOF selectivity towards CO production instead of CH4. Among all the investigated sacrificial agents for H2 production, methanol was the best. The performance of CO2 reduction process was found to be increasing with the pressure increase. Furthermore, the stability investigations revealed continuous productions of H2, CO and CH4 over the C3N4/MOF photocatalyst in multiple cyclic runs without any significant photocatalyst deactivation. This study provides new ideas for the fabrication of cheap, efficient and easy-synthesized nanomaterials for energy production and environmental remediation applications.
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DOI: 10.1016/j.fuel.2023.130561
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