Lv Yuancai, Yu Jianying, Huang Siyi, Zheng Kaiyun, Yang Guifang, Liu Yifan, Lin Chunxiang, Ye Xiaoxia, Liu Minghua
Research Institute of Photocatalysis, College of Environment and Resources, Fuzhou University, Fuzhou, 350116, China.
School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, China.
Environ Sci Pollut Res Int. 2021 Jun;28(22):28024-28037. doi: 10.1007/s11356-021-12610-9. Epub 2021 Feb 1.
Considering the high environmental risk, the remediation of antibiotic pollutants attracted numerous attentions. In this work, a novel photocatalyst, CeZrO/SnInS, was fabricated by in situ precipitation and hydrothermal method and then applied to the degradation of norfloxacin under the irritation of visible light. The SEM, TEM, XRD, XPS, and electrochemical results clearly showed that the n-type heterojunction between CeZrO and SnInS was successfully constructed, which greatly reduces the recombination of the photogenic electron and holes, leading to the improvement of photocatalytic performance and stability (recycled over eight times). Besides, the CeZrO/SnInS composite also exhibited good ability to mineralize norfloxacin. Under the optimal condition (pH 3, 1 g L of 10% CeZrO/SnInS, and 8 mg L of initial norfloxacin concentration), norfloxacin could be fully and rapidly degraded in 60 min, and completely mineralized in 4 h (99.3 ± 1.7%). LC-QTOF-MS results evidently displayed eight intermediates during norfloxacin degradation. In addition, with the attack of the reactive oxygen species (h, •OH, and •O), norfloxacin could be effectively decomposed via deoxygenation, hydroxylation, and carboxylation reactions. Notably, compared to photodegradation, the photocatalytic process could completely eliminate the norfloxacin from water because it could avoid the accumulation of toxic byproducts.
鉴于高环境风险，抗生素污染物的修复引起了众多关注。在本工作中，通过原位沉淀和水热法制备了一种新型光催化剂CeZrO/SnInS，然后将其应用于可见光照射下诺氟沙星的降解。扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）和电化学结果清楚地表明，CeZrO和SnInS之间成功构建了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（可循环使用八次以上）。此外，CeZrO/SnInS复合材料对诺氟沙星也表现出良好的矿化能力。在最佳条件下（pH值为3，1 g/L的10% CeZrO/SnInS，初始诺氟沙星浓度为8 mg/L），诺氟沙星可在60分钟内完全快速降解，并在4小时内完全矿化（99.3±1.7%）。液相色谱-四极杆飞行时间质谱（LC-QTOF-MS）结果明显显示了诺氟沙星降解过程中的八种中间体。此外，在活性氧物种（h、•OH和•O）的攻击下，诺氟沙星可通过脱氧、羟基化和羧化反应有效分解。值得注意的是，与光降解相比，光催化过程可以完全从水中去除诺氟沙星，因为它可以避免有毒副产物的积累。
