Metronidazole Degradation via Visible Light-Driven Z-Scheme BiTmDySbO7/BiEuO3 Heterojunction Photocatalyst

作者：Jingfei Luan, Zhe Li, Ye Yao, Jiannong Wang, Liang Hao · 发表于：Sustainability · 年份：2025 · DOI：10.3390/su172210024 · 被引用次数：2 · 研究领域：Advanced Photocatalysis Techniques、TiO2 Photocatalysis and Solar Cells、Pharmaceutical and Antibiotic Environmental Impacts

This study presented the successful synthesis of a visible light responsive Z-scheme BiTmDySbO7/BiEuO3 heterojunction photocatalyst (BBHP) via the hydrothermal method, exhibiting outstanding removal efficiency for degrading the metronidazole (MNZ) in wastewater. The BBHP exhibited exceptional photocatalytic activity during the degradation process of the MNZ which was a widely detected pharmaceutical pollutant in aquatic environments. The key to the high photocatalytic activity of the BBHP was the formation of a Z-scheme photogenerated carrier transport channel which existed between BiTmDySbO7 and BiEuO3 within the heterojunction structure. This innovative structural design was experimentally confirmed for enhancing the separation efficiency of the photogenerated charge carriers significantly, thereby, the efficient photocatalytic activity of the BBHP was promoted. After visible light irradiation for 130 min, the BBHP achieved a removal efficiency of 99.56% for degrading MNZ and a mineralization rate of 98.11% for removing the total organic carbon (TOC) concentration. In contrast to a single photocatalyst, the removal rate of the MNZ by using the BBHP was 1.14 times that by using the BiEuO3, 1.26 times that by using the BiTmDySbO7, and 2.65 times that by using the nitrogen-doped TiO2 (N-T) under visible light irradiation. The mineralization rate for removing the TOC concentration during the degradation process of the MNZ by using the BBHP was 1.17 times that by using the BiEuO...