School of Civil Engineering and Architecture, Anhui University of Technology, No 59 of Hudong Road, Maanshan City, 243002, Anhui, China.
Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, 243002, Anhui, China.
Environ Sci Pollut Res Int. 2018 Sep;25(26):25955-25966. doi: 10.1007/s11356-018-2610-1. Epub 2018 Jul 2.
A novel magnetic flocculant (CPAMF) was synthesized by using FeO coated with cationic polyacrylamide (CPAM) for flocculation of high turbid water. The surface morphology and chemical structures of CPAMF were confirmed by Fourier transform infrared spectroscopy (FTIR) and thermo-gravimetric analysis (TGA). X-ray diffraction (XRD) was employed to verify the crystal structure of CPAMF. The magnetic property of CPAMF was compared with FeO in this study. The flocculation performance by using flocculants CPAMF was evaluated in high turbid water treatment. The maximum transmittance 92.4% of kaolin suspension was achieved at corresponding optimal flocculation conditions. The result indicated that CPAMF was efficient in high turbid water flocculation. Analysis of FTIR, XRD of flocs, and zeta potential (ZP) of supernatant were accomplished for flocculation mechanism investigation. Because of low recovery factor in reflocculation under the effect of shear force on flocs, the bridging effect was found to be dominant in both acidic and alkaline conditions. Sedimentation experiments under the role of permanent magnet indicated that nano-FeO could effectively improve the settling property of CPAM. Graphical abstract ᅟ.
一种新型的磁性絮凝剂（CPAMF）是通过使用 FeO 包覆阳离子聚丙烯酰胺（CPAM）来合成的，用于高浊度水的絮凝。傅里叶变换红外光谱（FTIR）和热重分析（TGA）证实了 CPAMF 的表面形态和化学结构。X 射线衍射（XRD）用于验证 CPAMF 的晶体结构。在这项研究中，比较了 CPAMF 的磁性与 FeO 的磁性。在高浊度水处理中评价了使用絮凝剂 CPAMF 的絮凝性能。在相应的最佳絮凝条件下，高岭土悬浮液的最大透光率达到 92.4%。结果表明，CPAMF 对高浊度水絮凝有效。完成了絮凝机理研究的 FTIR、絮体的 XRD 和上清液的 ζ 电位（ZP）分析。由于在剪切力作用下絮体的再絮凝回收率较低，因此在酸性和碱性条件下均发现桥联效应占主导地位。在永久磁铁作用下的沉降实验表明，纳米 FeO 可以有效提高 CPAM 的沉降性能。
