CdS Nanoparticles Supported on a Dual Metal–Organic Framework as a Catalyst for the Photodegradation of Tetracycline

作者：Yuning Jin, Xichen Mi, Jianglu Qian, Na Ma, Wei Dai · 发表于：ACS Applied Nano Materials · 年份：2024 · DOI：10.1021/acsanm.3c05511 · 被引用次数：28 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Advanced Photocatalysis Techniques、Advanced Nanomaterials in Catalysis

The photocatalytic activity of individual metal–organic frameworks (MOFs) such as UiO-66-NH 2 and MIL-101(Fe) is less satisfactory due to the disappointing separation rate of electron–hole pairs and weak solar energy utilization efficiency. In this context, we develop hierarchical dual Z-scheme heterostructured photocatalysts prepared via an in situ hydrothermal synthesis method anchoring cadmium sulfide (CdS) nanoparticles onto the (UiO-66-NH 2 )-(MIL-101(Fe)) (UM) dual metal–organic frameworks. Attributed to the synergistic effects of CdS, UiO-66-NH 2, and MIL-101(Fe), the (UiO-66-NH 2 )-(MIL-101)(Fe)-CdS (UM-CdS) exhibits outstanding degradation activities toward TC degradability. Typically, 10 mg of UM-CdS achieved an 87% degradation rate of TC within 140 min, which is 8.7, 2.4, and 1.4 times than those of UiO-66-NH 2, MIL-101(Fe), and CdS, which achieved higher photocatalytic degradation rate with a less dosage of catalysts compared with previous reports. The outstanding photocatalytic activity of UM-CdS is primarily attributed to its hierarchical structure, which provides numerous active sites. Additionally, the special heterostructure not only exhibits a dual Z-scheme migration mechanism for charge carriers, which facilitates the efficient separation and migration of photoinduced electrons and holes, but also promotes the redox capability of UM-CdS. Furthermore, the trapping tests demonstrated that • O 2 –, • OH, and h + were the main active species during the photocat...