Abstract The novel composites of graphitic carbon nitride (g-C3N4) and CoAl hydrotalcite (LDH) were synthesized using a hydrothermal method, for which photocatalytic reduction performances were evaluated using Cr(VI) as a target pollutant. The results indicated that the incorporation of g-C3N4 to CoAl-LDH could improve Cr(VI) photoreduction activity in connection with the adding amounts of g-C3N4 during the preparation process. The g-C3N4/LDH1.6 prepared in 1.6 g·L−1 g-C3N4 showed the highest Cr(VI) reduction activity, which was 10.1 and 3.6-folds higher than that of pure g-C3N4 and CoAl-LDH under visible-light irradiation, respectively. The enhanced photocatalytic activity benefited from the synergistic effect in the heterojunction electric field on the interface between the g-C3N4 and CoAl-LDH, which accelerated the electron transfer and separation of photogenerated electrons and holes. The results make the heterojunction material a potential candidate for environmental restoration.

中文翻译：

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构建异质结 g-C3N4/CoAl 水滑石在可见光下高效还原 Cr(VI)

摘要 采用水热法合成了石墨氮化碳（g-C3N4）和CoAl水滑石（LDH）的新型复合材料，并以Cr（VI）为目标污染物对其光催化还原性能进行了评价。结果表明，在CoAl-LDH中加入g-C3N4可以提高Cr(VI)光还原活性，这与制备过程中g-C3N4的加入量有关。在 1.6 g·L−1 g-C3N4 中制备的 g-C3N4/LDH1.6 表现出最高的 Cr(VI) 还原活性，在可见光下是纯 g-C3N4 和 CoAl-LDH 的 10.1 和 3.6 倍。 - 光照射，分别。增强的光催化活性得益于异质结电场在 g-C3N4 和 CoAl-LDH 之间的界面上的协同作用，这加速了光生电子和空穴的电子转移和分离。结果使异质结材料成为环境修复的潜在候选材料。