2022 Fiscal Year Annual Research Report
Fabrication of photocatalyst composites of C3N4 with steel slag for carbon negative
| Project/Area Number |
22F22083
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| Allocation Type | Single-year Grants |
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| Research Institution | Kyushu University |
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Principal Investigator |
笹木 圭子 九州大学, 工学研究院, 教授 (30311525)
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| Co-Investigator(Kenkyū-buntansha) |
SRIKHAOW ASSADAWOOT 九州大学, 工学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2022-04-22 – 2024-03-31
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| Keywords | Steel slag / graphitic carbon nitride / sugar conversion / lactic acid production / photobiorefinery / steel slag utilization |
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| Outline of Annual Research Achievements |
The oxygen-doped g-C3N4/artificial converter slag composites (OCN/artCS) were successfully prepared and further used as reusable and high-performance photocatalysts for transformation of monosaccharides to lactic acid under the simulated sunlight irradiation. Owing to the presence of Ca2Fe2O5 in the artCS, the artCS is able to serve as a photocatalyst support for OCN to grow on its surface and then form the OCN/Ca2Fe2O5-contiaing artCS heterojunction. The experimental results demonstrated that the OCN/artCS composites exhibited greater photocatalytic performance for selective production of lactic acid from glucose than the pure OCN. About 99% glucose conversion and 90% lactic acid production were achieved using the OCN/5%artCS composite to activate the reaction under the simulated solar light irradiation for 60 min at 50 °C. The results from PL, EIS and ERDT patterns suggested that the separation and transportation of photogenerated charge carriers were greatly improved after formation of the heterojunction between OCN and Ca2Fe2O5, which is an effective component in the artCS. Moreover, the presence of metallic oxide in the artCS can possibly increase the pH and shifted the isomerization equilibrium to accelerate the fructose production, leading to the high selective production of lactic acid. The OCN/5%artCS exhibited excellent stability towards photocatalytic production of lactic acid and can be reused for tenth cycles without significant loss of its photocatalytic activity. This work was submitted to the Chemical Engineering Journal and is currently under review.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The research has been carried out in accordance with the plan of the application, the results have been obtained, and the thesis is now under review. The next research topics are also becoming clearer and clearer.
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| Strategy for Future Research Activity |
The performance of the steel converter slag-containing Ca2Fe2O5/alkaline metal modified graphitic carbon nitride composites (CS/AMCN) for photocatalytic transformation of glucose and other sugars to lactic acid (or other value-added chemicals) under the simulated sunlight irradiation will be conducted. Basically, the high basicity of the catalyst could increase the pH and possibly shift the isomerization equilibrium from glucose to fructose. Thus, the modification of graphitic carbon nitride with alkaline metal can enhance the fructose production, leading to the high selective production of lactic acid form the photocatalytic sugar conversion. Moreover, the synergistic effect of AMCN and basicity of metallic oxide in the artCS may greatly enhance the formation of fructose from the glucose isomerization. Combination with the improved photogenerated charge separation and transportation in the CS/AMCM heterojunction. The as-prepared CS/AMCN composites will deliver high photocatalytic performance in lactic acid production from glucose with high selectivity. The research plans can be divided into three parts 1) Enhancing the basicity and photocatalytic activity of CS/AMCS by modification with Mg, Ca or Sr. 2) Improving the photogenerated charge transportation and separation by construction of the heterojunction between the steel converter slag-bearing Ca2Fe2O5/alkaline-earth metal modified g-C3N4. 3) Photocatalytic conversion of glucose or other sugars to lactic acid under the simulated sunlight irradiation using CS/AMCN composites will be investigated.
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