A novel Z-type BiOCl/Ni-MOF-74 heterojunction with coral reef-like structure for photodegradation of tetracycline and rhodamine B and degradation pathway analysis
Materials Science in Semiconductor Processing(2023)
Abstract
The presence of defects in BiOCl, caused by its wide bandgap, hampers its ability to effectively respond to visible light. In this paper, Z-type BiOCl/Ni-MOF-74 (B/N) heterojunctions were synthesized using the hydrothermal method, The crystal structure, morphological characteristics, and physicochemical properties of the composite material were tested through multiple characterization methods, demonstrating Ni-MOF-74 (N-M-74) successful loading on BiOCl. For the degradation, tetracycline (TC) and rhodamine B (RhB) was chosen, and the degradation performance of the synthesized B/N system was assessed under visible light. BiOCl/Ni-MOF-74-7 wt% (B/N-7) showing optimal degradation performance, and the degradation rate of TC and RhB within 100 min was 93% and 97%, respectively. This is due to the composition of heterojunctions, which forms a good band structure and prevents the rebuild of photogenerated charge carriers. The free radical capture experiment and ESR technique demonstrated that •O2− and h+ were crucial in the degradation of TC and RhB. Finally, a Z-type mechanism is proposed to explain the mechanism. 3D Fluorescence Spectra (3D EEMS) and Liquid Chromotography with Mass Spectrometry (LC-MS) were combined to analyze the degradation process.
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Key words
BiOCl/Ni-MOF-74,Z-type heterojunction,Photodegradation,Degradation pathway
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