Research Institute of Photocatalysis, College of Environment & Resources, Fuzhou University, Fuzhou, 350116, China.
Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, PR China.
Chemosphere. 2021 May;271:129452. doi: 10.1016/j.chemosphere.2020.129452. Epub 2020 Dec 28.
Considering the high environmental risk, the remediation of veterinary drug pollutants aroused numerous concerning. In this paper, a novel photocatlyst, SnO/SnInS, was fabricated by in situ precipitation and hydrothermal method and then employed to simulate photocatalytic degradation of olaquindox under visible light. The SEM, TEM, XRD, XPS and electrochemical results clearly showed that the n-type heterojunction between SnO and SnInS was successfully constructed, which greatly reduce the recombination of the photogenic electron and holes, leading to the improvement of photocalytic performance and stability (recycled over 10 times). Besides, the SnO/SnInS composite also exhibited good ability to mineralize the olaquindox. Under the optimal condition (pH of 3, 1 g L of 30 wt% SnO/SnInS and 10 mg L of initial olaquindox concentration), the olaquindox could be fully and rapidly degraded in 25 min, and completely mineralized in 2 h (99.3 ± 1.7%). LC-QTOF-MS analysis evidently displayed 10 intermediates during the olaquindox degradation. In addition, with the attack of the reactive oxygen species (h, •OH and •O), olaquindox could be effectively decomposed via deoxygenation, hydroxylation and carboxylation reactions. Importantly, compared to photodegradation, the photocatalytic process was an ideal way to eliminate the olaquindox form water because it could avoid the accumulation of toxic byproducts.
考虑到其高环境风险，兽药污染物的修复引起了人们的广泛关注。本文通过原位沉淀和水热法制备了一种新型光催化剂 SnO/SnInS，并将其用于模拟可见光下土霉素的光催化降解。SEM、TEM、XRD、XPS 和电化学结果清楚地表明，成功构建了 SnO 和 SnInS 之间的 n 型异质结，这大大减少了光生电子和空穴的复合，从而提高了光催化性能和稳定性（可循环使用 10 次以上）。此外，SnO/SnInS 复合材料还表现出良好的矿化土霉素的能力。在最佳条件（pH 为 3、1 g/L 的 30wt%SnO/SnInS 和 10 mg/L 的初始土霉素浓度）下，土霉素可在 25 min 内完全快速降解，并在 2 h 内完全矿化（99.3±1.7%）。LC-QTOF-MS 分析清楚地显示了土霉素降解过程中的 10 种中间产物。此外，由于活性氧物种（h、•OH 和 •O）的攻击，土霉素可以通过脱氧、羟化和羧化反应有效地分解。重要的是，与光降解相比，光催化过程是从水中消除土霉素的理想方法，因为它可以避免有毒副产物的积累。
