Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China; School of Materials and Physics, China University of Mining and Technology, Xuzhou 221008, China.
Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China; School of Materials and Physics, China University of Mining and Technology, Xuzhou 221008, China.
J Environ Sci (China). 2023 May;127:700-713. doi: 10.1016/j.jes.2022.06.032. Epub 2022 Jul 3.
Designing high-efficiency photocatalysts responsive to visible light is important for the degradation of antibiotics in water. Heterojunction engineering is undoubtedly an effective strategy to improve the photocatalytic performance. In this work, spinel-type metal oxides (NiAlO, NAO) are synthesized by a simple sol-gel and calcination process. After compounding graphitic carbon nitride (g-CN), NAO/g-CN heterojunction is obtained, which then is used as the photocatalyst for tetracycline hydrochloride (TC). The effects of photocatalyst dosage, the initial concentration of TC, and solution pH on photodegradation performance are systematically studied. The removal rate of TC on NAO/g-CN reach up to ∼90% after visible light irradiation for 2 hr and the degradation rate constant is ∼7 times, and ∼32 times higher than that of pure NAO and g-CN. The significantly improved photocatalytic activity can be attributed to the synergistic effect between well matched energy levels in NAO/g-CN heterojunctions, improvement of interfacial charge transfer, and enhancement of visible light absorption. This study provides a way for the synthesis of efficient photocatalysts and an economic strategy for removing antibiotics contamination in water.
设计对可见光响应的高效光催化剂对于水中抗生素的降解非常重要。异质结工程无疑是提高光催化性能的有效策略。在这项工作中，尖晶石型金属氧化物（NiAlO，NAO）通过简单的溶胶-凝胶和煅烧工艺合成。在复合石墨相氮化碳（g-CN）后，得到了 NAO/g-CN 异质结，并将其用作盐酸四环素（TC）的光催化剂。系统研究了光催化剂用量、TC 的初始浓度和溶液 pH 值对光降解性能的影响。在可见光照射 2 小时后，TC 在 NAO/g-CN 上的去除率高达约 90%，降解速率常数约为纯 NAO 和 g-CN 的 7 倍和 32 倍。光催化活性的显著提高归因于 NAO/g-CN 异质结中能级的良好匹配、界面电荷转移的提高和可见光吸收的增强。本研究为高效光催化剂的合成提供了一种方法，为水中抗生素污染的去除提供了一种经济的策略。
