摘要
以硝酸钴和硝酸铁为主要原料,采用化学共沉淀法制备CoFe2O4纳米磁性微粒,然后将其与膨胀石墨复合制得CoFe2O4载量不同的磁性膨胀石墨。用X射线衍射(XRD)、透射电镜(TEM)、震动样品磁强计(VSM)、扫描电镜(SEM)对CoFe2O4纳米磁性微粒和磁性膨胀石墨进行了表征。并研究了CoFe2O4载量不同的磁性膨胀石墨对不同油类的饱和吸油量、对水和油的竞争吸附比、不同吸附时间和环境温度对饱和吸油量的影响、磁分离回收及离心法再生吸附后的磁性膨胀石墨。结果表明,合成的CoFe2O4结晶度高,晶粒度约为13nm。CoFe2O4载量越低、油品粘度越高,磁性膨胀石墨的饱和吸油量越大;油品粘度越大,油、水竞争吸附时水含量越低;磁性膨胀石墨10s即可达到饱和吸油量的80%,90s后达到饱和吸附;CoFe2O4载量为35%时,磁回收率为99.2%,且再生离心转速为3000r/min时再生吸油量达到较大值。
Nano magnetic particles-CoFe2 04 were prepared by chemical co-precipitation method using Co（NO3）2 · 6H2OandFe（NO3）3 · 9H2O,then composite the CoFe204 with expanded graphite to get different loading （mass fraetion, the same below） magnetic expanded graphite. CoFe204 and magnetic expanded graphite were characterized by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron mieroscopy（TEM）and vibration sample magnetometer（VSM）. The artiele study on the oil absorption in different loading magnetic expanded graphite, the competitive adsorption in oil and water, time and tempera- ture on the influence of oil absorption, separation and regeneration the magnetic expanded graphite. The results show that the CoFe2O4 has high crystallinity and the grain size is about 13nm. An increase in oil viscosity and lower CoFe2 04 load results in an increase in the adsorption. Moisture content decreases with higher oil viscosity in the competitive adsorption in oil and water. The oil absorption achieved 80% within 10s and 90s to saturable. The magnetic separation recovery rate of magnetic expanded graphite is 99.2% when the CoFe204 load is 35%. and the regeneration oil absorption achieve greater value when centrifugal speed for 3000r/min.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2013年第12期1782-1786,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50804039)
关键词
磁性膨胀石墨
吸油性能
磁回收
再生
magnetic expanded graphite
adsorption
magnetic separation recovery
regeneration
