Zhang Ying, Bo Xinkang, Zhu Tao, Zhao Wei, Cui Yumin, Chang Jianguo
Anhui Provincial Key Laboratory of Green Carbon Chemistry, School of Chemistry and Material Engineering, Fuyang Normal University, Fuyang 236037, China.
Nanomaterials (Basel). 2024 Nov 11;14(22):1802. doi: 10.3390/nano14221802.
Zinc oxide-based photocatalysts with non-toxicity and low cost are promising candidates for the degradation of tetracycline. Despite the great success achieved in constructing n-n-type ZnO-based heterojunctions for the degradation of tetracycline under full-spectrum conditions, it is still challenging to realize rapid and efficient degradation of tetracycline under visible light using n-n-type ZnO-based heterojunctions, as they are constrained by the quick recombination of electron-hole pairs in ZnO. Here, we report highly efficient and stable n-n-type ZnO-TiO heterojunctions under visible light conditions, with a degradation efficiency reaching 97% at 1 h under visible light, which is 1.2 times higher than that of pure zinc oxide, enabled by constructing an n-n-type heterojunction between ZnO and TiO to form a built-in electric field. The photocatalytic degradation mechanism of n-n TiO-ZnO to tetracycline is also proposed in detail. The demonstration of efficient and stable heterojunction-type ZnO photocatalysts under visible light is an important step toward commercialization and opens up new opportunities beyond conventional ZnO technologies, such as composite ZnO catalysts.
具有无毒且低成本特性的氧化锌基光催化剂是降解四环素的有潜力的候选材料。尽管在构建用于全光谱条件下四环素降解的n-n型氧化锌基异质结方面取得了巨大成功，但利用n-n型氧化锌基异质结在可见光下实现四环素的快速高效降解仍然具有挑战性，因为它们受到氧化锌中电子-空穴对快速复合的限制。在此，我们报道了在可见光条件下高效且稳定的n-n型氧化锌-二氧化钛异质结，在可见光下1小时的降解效率达到97%，比纯氧化锌高1.2倍，这是通过在氧化锌和二氧化钛之间构建n-n型异质结以形成内建电场实现的。还详细提出了n-n型二氧化钛-氧化锌对四环素的光催化降解机理。可见光下高效稳定的异质结型氧化锌光催化剂的证明是迈向商业化的重要一步，并为超越传统氧化锌技术（如复合氧化锌催化剂）开辟了新机遇。
