National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China.
Sci Total Environ. 2019 Apr 20;662:978-989. doi: 10.1016/j.scitotenv.2019.01.194. Epub 2019 Jan 17.
Triclosan (TCS), an antimicrobial agent added in many pharmaceutical and personal care products, can cause some environmental problems due to its bioaccumulation, toxicity and potential antibiotic cross-resistance. In this study, Ginkgo biloba L. leaf extract was used as the green stabilizing agent to synthesize Fe/Co bimetallic nanoparticles (G-Fe/Co NPs), which were applied to remove TCS from aqueous solution. G-Fe/Co NPs were characterized by TEM, EDS, SEM, BET, FTIR, XRD and XPS. G. biloba L. leaf extract improved the dispersion and reduced the passivation of NPs. The TCS removal efficiency followed the order of G-Fe/Co NPs > G-Fe NPs > Co NPs > Fe/Co NPs > Fe NPs. G-Fe/Co NPs can be reused at least eight times. The Co leaching under different initial pH values was negligible. The factors affecting the TCS removal were investigated. The results indicated that the removal of TCS followed pseudo-second-order kinetics, and the removal rate constant decreased with increasing the initial pH value and the initial TCS concentration, and decreasing the Co loading of G-Fe/Co NPs and NPs dosage. The mass balance of TCS removal by G-Fe/Co NPs indicated that adsorption was dominant process and TCS degradation was an accumulative process.
三氯生（TCS）作为一种添加在许多医药和个人护理产品中的抗菌剂，由于其生物蓄积性、毒性和潜在的抗生素交叉耐药性，可能会引发一些环境问题。在本研究中，我们使用银杏叶提取物作为绿色稳定剂来合成 Fe/Co 双金属纳米粒子（G-Fe/Co NPs），并将其应用于从水溶液中去除 TCS。通过 TEM、EDS、SEM、BET、FTIR、XRD 和 XPS 对 G-Fe/Co NPs 进行了表征。银杏叶提取物改善了 NPs 的分散性并减少了 NPs 的钝化作用。TCS 的去除效率顺序为 G-Fe/Co NPs>G-Fe NPs>Co NPs>Fe/Co NPs>Fe NPs。G-Fe/Co NPs 至少可以重复使用八次。在不同初始 pH 值下，Co 的浸出可以忽略不计。研究了影响 TCS 去除的因素。结果表明，TCS 的去除遵循拟二级动力学，去除速率常数随着初始 pH 值和初始 TCS 浓度的增加以及 G-Fe/Co NPs 的 Co 负载量和 NPs 用量的减少而降低。G-Fe/Co NPs 去除 TCS 的质量平衡表明，吸附是主要的过程，而 TCS 的降解是一个累积的过程。
