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

成功地制备了掺氧g-C3N4/人工转炉渣复合材料(OCN/ArtCS)，并将其用于模拟太阳光照射下单糖转化为乳酸的可重复使用的高效光催化剂。由于Ca2Fe2O5的存在，ArtCS能够作为光催化剂载体使OCN在其表面生长，从而形成OCN/Ca2Fe2O5-ArtCS异质结。实验结果表明，与纯OCN相比，OCN/ArtCS复合材料对葡萄糖选择性合成乳酸具有更好的光催化性能。在50℃的模拟太阳光照射下，OCN/5%ArtCS复合材料催化反应60min，葡萄糖转化率约为99%，乳酸产量约为90%。PL、EIS和ERDT测试结果表明，OCN与ArtCS中的有效成分Ca2Fe2O5形成异质结后，光生载流子的分离和输运能力大大提高。此外，金属氧化物的存在可能会提高发酵体系的pH值，使异构化平衡发生改变，从而加速果糖的合成，从而提高乳酸的选择性。OCN/5%ArtCS对光催化合成乳酸表现出良好的稳定性，可以重复使用10次，光催化活性不会有明显的损失。这项工作已提交给《化学工程杂志》，目前正在进行审查。

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.