Cui Lifeng, Zou Xuhui, Liu Yanan, Li Xi, Jiang Lingchang, Li Chengyun, Yang Liuqing, Yu Mengjie, Wang Yangang
Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China.
J Colloid Interface Sci. 2020 Oct 1;577:233-241. doi: 10.1016/j.jcis.2020.05.023. Epub 2020 May 23.
MOF-5 has been criticized for its poor water stability, which results in complete damage of its traditional functionality. Therefore, there are very few researches about the further application of hydrolyzed MOF-5 (h-M). However, in this work, the h-M can function as both superior support and semiconductor for photocatalytic reaction after a water-based process. Herein, a rational design of ZnCdS@h-MOF-5 (ZCS@h-M) heterojunction photocatalyst has been synthesized via a hydrothermal method with different mass ratio of ZCS. As demonstrated in the results of SEM and TEM, during the hydrothermal process, MOF-5 exfoliated into two-dimensional small sheets and ZCS nanoparticles embedded into h-M frameworks, which is in favor for the dispersion of ZCS and better interface connection, thus further boosts the migration of photogenerated charge carriers and protect the photocorrosion of ZCS, ultimately improves the photocatalytic hydrogen production. Optimal ZCS content of 10 wt% exhibited a significantly enhanced visible light photocatalytic hydrogen production efficiency of 15.08 mmol h g, which far surpassed bare ZCS at 7.62 times. Furthermore, the ZCS@h-M showed outstanding stability during photocatalytic hydrogen production over a number of cycles.
MOF-5因其较差的水稳定性而受到批评，这导致其传统功能完全受损。因此，关于水解MOF-5（h-M）的进一步应用的研究非常少。然而，在这项工作中，经过水基处理后，h-M可以作为光催化反应的优良载体和半导体。在此，通过水热法以不同质量比的ZCS合成了一种合理设计的ZnCdS@h-MOF-5（ZCS@h-M）异质结光催化剂。如SEM和TEM结果所示，在水热过程中，MOF-5剥离成二维小片，ZCS纳米颗粒嵌入h-M框架中，这有利于ZCS的分散和更好的界面连接，从而进一步促进光生载流子的迁移并保护ZCS的光腐蚀，最终提高光催化产氢性能。10 wt%的最佳ZCS含量表现出显著提高的可见光光催化产氢效率，为15.08 mmol h g，远远超过裸ZCS的7.62倍。此外，ZCS@h-M在多次光催化产氢循环中表现出出色的稳定性。
