Nguyen Dung T, Pham Lan T, Le Ha T T, Vu Minh X, Le Hanh T M, Le Huong T M, Pham Nam H, Lu Le T
Institute for Tropical Technology, Vietnam Academy of Science and Technology, Hanoi Hoang Quoc Viet str. 18, Cau Giay Hanoi Vietnam
Graduate University of Science and Technology, Vietnam Academy of Science and Technology Hoang Quoc Viet str. 18, Cau Giay Hanoi Vietnam.
RSC Adv. 2018 May 30;8(35):19707-19712. doi: 10.1039/c8ra03096k. eCollection 2018 May 25.
Magnetic nanoparticles have received much interest for their application in wastewater treatment because of their easy retrieval and reuse. However, the methods used to synthesise high saturation magnetization magnetic nanoparticles require expensive and pure precursors. In the current study, we explore the potential for using spent pickling liquor, a wastewater solution from steel factories, as the iron precursor for preparing iron oxide nanoparticles. Here, magnetic FeO nanoparticles were synthesized the oxidation-precipitation of spent pickling liquors using a saturated solution of calcium hydroxide at room temperature. The FeO nanoparticles were then modified with antibacterial polyguanidine to form a nanocomposite. It was found that monodisperse magnetic FeO nanoparticles with a size in the range 20-30 nm and a high saturation magnetization value of 73.9 emu g were synthesised. The FeO nanoparticles were successfully encapsulated with polyguanidine to form an FeO/polyguanidine nanocomposite. FT-IR and TGA analysis results indicated the presence of the polymer on the FeO surface and the polymer content in the nanocomposite was about 15% (w/w). The FeO/polyguanidine nanocomposite exhibited strong antibacterial activity against (), demonstrating its potential for use in disinfecting wastewater.
磁性纳米颗粒因其易于回收和再利用而在废水处理中的应用备受关注。然而，用于合成高饱和磁化强度磁性纳米颗粒的方法需要昂贵且纯净的前驱体。在当前的研究中，我们探索了将钢铁厂废水酸洗废液用作制备氧化铁纳米颗粒铁前驱体的可能性。在此，通过在室温下用氢氧化钙饱和溶液对酸洗废液进行氧化沉淀来合成磁性FeO纳米颗粒。然后用抗菌聚胍对FeO纳米颗粒进行改性以形成纳米复合材料。结果发现，合成出了尺寸在20 - 30 nm范围内、高饱和磁化强度值为73.9 emu/g的单分散磁性FeO纳米颗粒。FeO纳米颗粒成功地被聚胍包裹形成了FeO/聚胍纳米复合材料。傅里叶变换红外光谱（FT - IR）和热重分析（TGA）结果表明FeO表面存在聚合物，且纳米复合材料中的聚合物含量约为15%（w/w）。FeO/聚胍纳米复合材料对（此处原文括号内容缺失具体细菌名称）表现出强大的抗菌活性，证明了其在废水消毒中的应用潜力。
