College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan, 410082, China.
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan, 410082, China.
Chemosphere. 2021 Nov;282:131049. doi: 10.1016/j.chemosphere.2021.131049. Epub 2021 May 29.
A new type of 0D-2D Z-scheme heterojunction photocatalyst (MoO/g-CN) was successfully prepared via simple hydrothermal calcination method. The catalytic activities of MoO/g-CN was evaluated by the degradation effect of tetracycline. The results indicated that the 0D-2D MoO/g-CN Z-scheme heterojunction was significantly better than that of original g-CN. Especially, the optimal 0.5 wt% MoO/g-CN could reach 85.9% removal efficiency within 100 min under visible light irradiation (λ > 420 nm), and its degradation rate constant was 2.3 times higher than that of g-CN·In addition, the effects of real water matrix, natural sunlight irradiation on tetracycline removal were examined. Reactive-species-trapping experiments show that both photo-generated •O and h are the main active species in the photocatalytic process. Besides, the results of •O and •OH detection further indicated that the yield amount of •O and •OH in MoO/g-CN case showed enhancement when compared with g-CN. Moreover, the quite stable crystal structure and excellent recycling ability endowed the MoO/g-CN composite with a great potential for applying in photocatalytic fields.
一种新型的 0D-2D Z 型异质结光催化剂（MoO/g-CN）通过简单的水热煅烧法成功制备。通过四环素的降解效果评估了 MoO/g-CN 的催化活性。结果表明，0D-2D MoO/g-CN Z 型异质结明显优于原始 g-CN。特别是，在可见光照射下（λ>420nm），最佳的 0.5wt% MoO/g-CN 在 100min 内可达到 85.9%的去除效率，其降解速率常数是 g-CN 的 2.3 倍。此外，还考察了实际水基质、自然光照射对四环素去除的影响。自由基捕获实验表明，在光催化过程中，光生•O 和 h 都是主要的活性物质。此外，•O 和•OH 的检测结果进一步表明，与 g-CN 相比，MoO/g-CN 中•O 和•OH 的产率增加。此外，MoO/g-CN 复合材料具有相当稳定的晶体结构和优异的回收能力，为其在光催化领域的应用提供了巨大的潜力。
