磁性纳米粒子制备及其在印染厂污水处理中的应用

 选取聚合物包覆Fe3O4磁性纳米粒子作为超导磁分离污水处理工艺中的磁种，扩大超导磁分离技术在污水处理领域的应用范围。常温条件下合成Fe3O4磁性纳米粒子，利用X射线光电子能谱（XPS)，高分辨透射电镜（HRTEM）和振动样品磁强计（VSM）对制备的磁性纳米粒子性质进行评价。结果发现，磁性纳米粒子直径在6～10nm，表面被含有羧基的聚合物分子链包覆，且在常温下磁性纳米粒子显示超顺磁性。随后以印染厂污水为对象，检验磁性纳米粒子对污水处理的能力。本研究主要比较污水处理前后的浊度和化学需氧量（COD值），结果显示聚合物包裹Fe3O4磁性纳米粒子可有效去除印染厂废水中的污物。

Preparation of Magnetic Nano Particles and Its Application in Dyeing Wastewater Treatment

Polymer coated Fe3O4 magnetic nano particles are selected as a magnetic seeding for superconducting magnetic separation to expand its scope of application in the wastewater treatment. Fe3O4 nano particles are synthesized at the room temperature, and the properties of nano materials are determined by X-ray Photoelectron Spectroscopy(XPS), Transmission Electron Microscopy (TEM) and Vibrating Sample Magnetometer (VSM). It is shown that the diameter of nano particles ranges from 6~8nm, the surface of Fe3O4 nano particles is overlaid with the polymeric chain with carboxyl, and the nano particles show super paramagnetic properties at the room temperature. The decontamination capacity of the wastewater is tested using the dyeing wastewater. Quality indicators, such as the turbidity and Chemical Oxygen Demand (COD) are measured before and after the treatment with polymer coated Fe3O4 nano particles and compared. It is shown that the magnetic nano particles can effectively purify the waste in the dyeing wastewater.