摘要
以铁片和碳纤维为电极，采用电化学法实现了磁性Fe3 O4纳米晶混凝剂的快速制备、在线混凝和磁性过滤的预处理过程。采用X射线衍射仪（ XRD）和扫描电子显微镜（ SEM）等对磁性Fe3 O4纳米晶进行了表征。结果表明，所制备的磁性Fe3 O4纳米晶具有均匀的晶体尺寸，粒子尺寸分布在30~100 nm之间。利用Fe3 O4纳米晶对高浊度高岭土悬浊液进行了混凝研究，并在外加磁场的作用下实现了絮凝体和水体的快速分离。结果证实电化学法磁混凝技术能够快速高效去除污水浊度，省去了机械过滤过程。理论研究结果表明，磁性Fe3 O4纳米晶去除浊度的过程是电荷中和与沉淀卷扫共同作用的结果，而电荷中和过程发生是由于电化学制备Fe3 O4纳米晶时表面电荷种类的均一性。
The online preparation and coagulation of magnetic Fe3 O4 nanocrystallines were realized by electro-chemical method with iron and carbon fiber as electrode. The product was characterized by X-ray diffraction （ XRD） and scanning electron microscope（ SEM） . The results show that the Fe3 O4 nanocrystallines have uni-form crystallite size, but with particle size between 30 nm and 100 nm. The coagulation study of high turbidity kaolin suspension was carried out, and the separation between flocculation and water was realized under the action of magnetic field. The results confirm that the electrochemically magnetic coagulation technology can quickly and efficiently get rid of the turbidity without mechanical filtration. Theoretical research results show that the electrochemical method can control the Fe3 O4 types of surface charge, thus improve the effect of charge neutralization in water. The process of removing turbidity was due to the combination of charge neutra-lization and precipitation sweep process.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第12期2529-2533,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:51003010)
吉林省科技发展计划项目(批准号:SKLSSM201132
20140101090JC)
东北电力大学博士科研启动基金(批准号:11084)资助~~
关键词
电化学法
磁性Fe3
O4
纳米晶
在线混凝
Electrochemical method
Magnetic Fe3 O4 nanocrystalline
Online coagulation
