Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian Province, China.
Environmental Contaminants Group, Future Industries Institute, University of South Australian, Mawson Lakes, SA 5095, Australia.
Sci Total Environ. 2019 Dec 10;695:133878. doi: 10.1016/j.scitotenv.2019.133878. Epub 2019 Aug 14.
The mixed contamination of environmental matrices by antibacterial agents and heavy metals has attracted much attention worldwide due to the complex nature of their environmental interactions and their potential toxicity. In this work, green synthesized bimetallic iron/nickel nanoparticles (Fe/Ni NPs) was used to simultaneously remove triclosan (TCS) and copper (Cu (II)) under optimal experimental conditions with removal efficiencies of 75.8 and 44.1% respectively. However, in a mixed contaminant system the removal efficiencies of TCS and Cu (II) were lower than when TCS (85.8%) and Cu (II) (52.5%) were removed separately, suggesting that there was competitive relationship between the two contaminants and Fe/Ni NPs used for remediation. SEM-EDS, XRD and FTIR all indicated that both TCS and Cu (II) were adsorbed onto Fe/Ni NPs. Furthermore, while XPS showed that Cu (II) was reduced to Cu, GC-MS analysis showed that TCS also underwent degradation with 2,7/2,8-ClDD as the major intermediate. The adsorption of both contaminants fit well a pseudo second order kinetic model (R>0.998) and the Freundlich isotherm (R>0.905). Whereas the reduction kinetics obeyed a pseudo first order model. Thus, overall the removal of TCS and Cu (II) involved a combination of both adsorption and reduction. Finally, a removal mechanism for triclosan and Cu (II) was proposed. Overall, Fe/Ni NPs have the potential to practically coinstantaneously remove both TCS and Cu (II) from aqueous solution under a wide range of conditions.
由于抗菌剂和重金属在环境中相互作用的复杂性及其潜在毒性，它们在环境基质中的混合污染已引起全球关注。在这项工作中，绿色合成的双金属铁/镍纳米粒子（Fe/Ni NPs）在最佳实验条件下同时去除三氯生（TCS）和铜（Cu（II）），去除效率分别为 75.8%和 44.1%。然而，在混合污染物体系中，TCS 和 Cu（II）的去除效率低于 TCS（85.8%）和 Cu（II）（52.5%）单独去除时的去除效率，表明这两种污染物与用于修复的 Fe/Ni NPs 之间存在竞争关系。SEM-EDS、XRD 和 FTIR 均表明 TCS 和 Cu（II）均被吸附到 Fe/Ni NPs 上。此外，虽然 XPS 表明 Cu（II）被还原为 Cu，但 GC-MS 分析表明 TCS 也发生了降解，以 2,7/2,8-ClDD 为主要中间产物。两种污染物的吸附均很好地符合准二级动力学模型（R>0.998）和 Freundlich 等温线（R>0.905）。而还原动力学符合准一级动力学模型。因此，总体而言，TCS 和 Cu（II）的去除涉及吸附和还原的组合。最后，提出了一种去除三氯生和 Cu（II）的去除机制。总的来说，Fe/Ni NPs 有可能在广泛的条件下从水溶液中同时实际去除 TCS 和 Cu（II）。
