Fabrication of photocatalyst composites of C3N4 with steel slag for carbon negative

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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.