College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, China.
Sci Total Environ. 2019 Feb 10;650(Pt 1):408-418. doi: 10.1016/j.scitotenv.2018.08.434. Epub 2018 Sep 1.
Chromium metal-organic framework (MIL-101(Cr)) has been widely studied for removing organic contaminants from aqueous solutions due to its excellent water stability and giant pore size, but its low adsorption capacity limits the application. In this study, a new adsorbent MIL-101 loaded with CuCo bimetallic nanoparticles (CuCo/MIL-101) was successfully fabricated and applied in removal of tetracycline (TC) from aqueous solutions. The adsorption capacity of CuCo/MIL-101 for TC increased by 140% compared with that of pure MIL-101, which may be attributed to the chemical bonding between Cu and Co BNPs in MIL-101 and TC molecules. The effects of pH, ionic strength, humic acid and contact time on the adsorption were also discussed in detail. The results showed that the removal efficiency of TC solution with high concentration (100 mg L) by CuCo/MIL-101 was still as high as 82.9%. The data of adsorption kinetics and isotherms could be well fitted by Elovich model and Freundlich model, respectively. According to the fitting parameters, the maximum adsorption capacity of CuCo/MIL-101 reached up to 225.179 mg g. Additionally, the adsorption process of TC onto CuCo/MIL-101 was spontaneous and endothermic. Electrostatic interactions could play an important role in the adsorption process. The enhanced adsorption capacity, excellent reusability and water stability demonstrated the potential of CuCo/MIL-101 composite as a novel adsorbent for the removal of TC from aqueous solutions.
金属有机骨架（MIL-101(Cr)）由于其出色的水稳定性和巨大的孔径，已被广泛研究用于从水溶液中去除有机污染物，但由于其吸附容量低，限制了其应用。本研究成功制备了负载铜钴双金属纳米粒子的新型吸附剂 MIL-101（CuCo/MIL-101），并将其应用于去除水溶液中的四环素（TC）。与纯 MIL-101 相比，CuCo/MIL-101 对 TC 的吸附容量增加了 140%，这可能归因于 MIL-101 中 Cu 和 Co BNPs 与 TC 分子之间的化学键。还详细讨论了 pH 值、离子强度、腐殖酸和接触时间对吸附的影响。结果表明，CuCo/MIL-101 对高浓度（100mg/L）TC 溶液的去除效率仍高达 82.9%。吸附动力学和等温线的数据分别可以很好地拟合 Elovich 模型和 Freundlich 模型。根据拟合参数，CuCo/MIL-101 的最大吸附容量高达 225.179mg/g。此外，TC 吸附到 CuCo/MIL-101 上的过程是自发和吸热的。静电相互作用可能在吸附过程中起重要作用。增强的吸附容量、优异的可重复使用性和水稳定性表明，CuCo/MIL-101 复合材料作为一种新型吸附剂，具有从水溶液中去除 TC 的潜力。
