Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, Fujian Province, China.
Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, Fujian Province, China.
Chemosphere. 2023 Apr;319:138057. doi: 10.1016/j.chemosphere.2023.138057. Epub 2023 Feb 3.
As feed additives, oxytetracycline (OTC) and copper ion (Cu(II)) are often detected in livestock and poultry farming wastewater. To address this issue, firstly, the synthesis conditions of Fe/Mn nanoparticles (Fe/Mn NPs) were initially optimized using a response surface methodology (RSM) to yield highly active Fe/Mn NPs, where the application of RSM significantly increased the Fe/Mn NPs' efficiency in removing co-contamination OTC and Cu(II),respectively, from 45.8 to 86.2% and 14.9-67.2%. Secondly, scanning electron microscope and Nitrogen adsorption-desorption isotherms results showed that Fe/Mn NPs were composed of elliptic particles between 20 and 40 nm, a specific surface area of 59.5 m g, and a mean pore diameter of 5.27 nm. Fourier infrared spectrometer and X-ray photoelectron spectroscopy analysis revealed that amino, carboxyl and hydroxyl functional groups existed on the surface. Zeta potential indicated that Fe/Mn NPs maintained a high negative charge density between pH 1 and 11. These surface properties possessed by the green synthesized Fe/Mn NPs resulted in high adsorption efficiency for co-contamination OTC and Cu(II). Based on this, a removal mechanism based on a combination of complex-bridging effect, pore-filling, hydrogen bonding, surface complexation, ion exchange and electrostatic attraction was proposed. Finally, the assessment of Fe/Mn NPs used in swine wastewater demonstrated that both 99.9% OTC and 55.6% Cu(II) were removed.
作为饲料添加剂，土霉素（OTC）和铜离子（Cu（II））经常在畜牧业和家禽养殖业废水中被检测到。为了解决这个问题，首先，我们使用响应面法（RSM）优化了 Fe/Mn 纳米粒子（Fe/Mn NPs）的合成条件，以得到高活性的 Fe/Mn NPs，RSM 的应用显著提高了 Fe/Mn NPs 分别去除共污染 OTC 和 Cu（II）的效率，从 45.8%提高到 86.2%和 14.9-67.2%。其次，扫描电子显微镜和氮吸附-脱附等温线结果表明，Fe/Mn NPs 由 20-40nm 的椭圆形颗粒组成，比表面积为 59.5m2g，平均孔径为 5.27nm。傅里叶变换红外光谱和 X 射线光电子能谱分析表明，表面存在氨基、羧基和羟基官能团。Zeta 电位表明，Fe/Mn NPs 在 pH 1-11 之间保持高的负电荷密度。这些由绿色合成的 Fe/Mn NPs 具有的表面特性导致其对共污染 OTC 和 Cu（II）具有高的吸附效率。在此基础上，提出了一种基于复杂桥接效应、孔填充、氢键、表面络合、离子交换和静电吸引相结合的去除机制。最后，对 Fe/Mn NPs 在猪废水中的应用评估表明，OTC 的去除率达到了 99.9%，Cu（II）的去除率达到了 55.6%。
