State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, China.
Shanghai Institute of Pollution Control and Ecological Security, Shanghai, China.
Environ Sci Pollut Res Int. 2019 Nov;26(33):34345-34356. doi: 10.1007/s11356-019-06173-z. Epub 2019 Aug 19.
Fluoroquinolones (FQs) occur broadly in natural media due to its extensive use, and it has systematic effects on our ecosystem and human immunity. In this study, long-root Eichhornia crassipes was reclaimed as a multi-functional activated carbon (MFAC) to remove fluoroquinolones (FQs) from contaminated water. To get insight into the adsorption mechanism, multiple measurements, including FTIR and XPS analyses, were employed to investigate the adsorption processes of ciprofloxacin and norfloxacin as well as the experiments of effect of exogenous factors on adsorption performances. The results confirmed that the adsorption of FQs by MFAC was mainly attributed to the electrostatic interaction, hydrogen bond interaction, and electronic-donor-acceptor (EDA) interaction. In addition, the kinetics and thermodynamics experiments demonstrated that the MFAC possessed great adsorption performance for FQs. According to the Langmuir model, the saturated adsorption capacities exceeded 145.0 mg/g and 135.1 mg/g for CIP and NOR at 303.15 K, respectively. The column experiments were conducted to explore the application performance of MFAC on the advanced treatment of synthetic water at different flow rates and bed depths. The adsorption capacity of CIP on MFAC was estimated by the Thomas models and the bed-depth service time (BDST) models, reaching 127.56 mg/g and 11,999.52 mg/L, respectively. These results also provide a valid approach for the resource recycling of the redundant long-root Eichhornia crassipes plants. Graphical abstract.
氟喹诺酮类（FQs）由于广泛使用而广泛存在于自然介质中，对我们的生态系统和人类免疫力产生系统性影响。在本研究中，长根凤眼莲被回收为多功能活性炭（MFAC），以去除受污染水中的氟喹诺酮类（FQs）。为了深入了解吸附机制，采用多种测量方法，包括傅里叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）分析，研究了环丙沙星和诺氟沙星的吸附过程以及外源因素对吸附性能的影响实验。结果证实，MFAC 对 FQs 的吸附主要归因于静电相互作用、氢键相互作用和电子供体-受体（EDA）相互作用。此外，动力学和热力学实验表明，MFAC 对 FQs 具有出色的吸附性能。根据朗缪尔模型，在 303.15 K 下，CIP 和 NOR 的饱和吸附容量分别超过 145.0 和 135.1 mg/g。进行了柱实验，以探索 MFAC 在不同流速和床层深度下对合成水的深度处理的应用性能。通过托马斯模型和床层深度服务时间（BDST）模型估计 CIP 在 MFAC 上的吸附容量，分别达到 127.56 mg/g 和 11,999.52 mg/L。这些结果还为冗余长根凤眼莲植物的资源回收提供了一种有效方法。
