Abstract Uniformly distributed single layer of ZIF67–derived C3N4 (ZIF67-C3N4) was synthesized and applied to the photocatalytic degradation of methylene blue (MB) under visible light. Results indicated that the obtained ZIF67-C3N4 has a maximum specific surface area of 541.392 m2/g, which is much larger than that of raw C3N4 of 97.291 m2/g. The investigation of C3N4 amount involved in ZIF67-C3N4 on the photoactivity revealed that 2.57 g ZIF67 with 0.3 g C3N4, which named ZIF67-C3N4(0.3) exhibited superior photocatalytic activities. More than 90% of MB at 10 mg/L was degraded within 70 min with the addition of 0.01 g ZIF67-C3N4(0.3), while this time required for raw C3N4 was over 140 min. The effects of pH of solution, initial concentration of MB and dosage of C3N4 in ZIF67-C3N4 composites on the photocatalytic efficiency for MB degradation were also evaluated. Quenching experiments indicated that the photo-induced holes (h+) and superoxide radicals (O2−•) were mainly responsible for MB degradation. It is anticipated that the insertion of ZIF67 nanoparticles not only increases the adsorption capacity of C3N4 but also promotes the generation and migration of the photo–induced active species.

中文翻译：

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单层ZIF67纳米粒子修饰的C3N4在可见光下高效光催化降解有机污染物

摘要 合成了均匀分布的单层 ZIF67 衍生的 C3N4 (ZIF67-C3N4) 并将其应用于可见光下亚甲基蓝 (MB) 的光催化降解。结果表明，所得ZIF67-C3N4的最大比表面积为541.392 m2/g，远大于原C3N4的97.291 m2/g。参与ZIF67-C3N4 的C3N4 量对光活性的研究表明，2.57 g ZIF67 和0.3 g C3N4，命名为ZIF67-C3N4(0.3) 表现出优异的光催化活性。添加 0.01 g ZIF67-C3N4(0.3) 后，90% 以上的 10 mg/L MB 在 70 分钟内被降解，而原始 C3N4 所需的时间超过 140 分钟。溶液pH值的影响，还评估了 ZIF67-C3N4 复合材料中 MB 的初始浓度和 C3N4 用量对 MB 降解的光催化效率的影响。淬火实验表明，光致空穴(h+) 和超氧自由基(O2-•) 是MB 降解的主要原因。预计 ZIF67 纳米粒子的插入不仅增加了 C3N4 的吸附能力，而且促进了光诱导活性物质的产生和迁移。