采用均匀共沉淀法制备了CoFe2O4含量不同的一组磁性水滑石(MgAl-LDHs-CoFe2O4),研究了MgAl-LDHsCoFe2O4晶体结构、微观形貌、磁性能、热稳定性及其对溶液中磷元素的吸收情况。X-射线衍射(XRD)图谱表明少量CoFe2O4的加入没有影响水滑石...采用均匀共沉淀法制备了CoFe2O4含量不同的一组磁性水滑石(MgAl-LDHs-CoFe2O4),研究了MgAl-LDHsCoFe2O4晶体结构、微观形貌、磁性能、热稳定性及其对溶液中磷元素的吸收情况。X-射线衍射(XRD)图谱表明少量CoFe2O4的加入没有影响水滑石的结晶性能,磁性水滑石具有典型的水滑石特征峰,同时含有CoFe2O4特征峰;扫描电镜(SEM)图片显示采用均匀共沉淀法制备磁性水滑石是片层状结构,磁性基质CoFe2O4均匀地吸附在水滑石片层表面;磁性水滑石样品经振动样品磁强计(VSM)测试结果发现磁性水滑石具有铁磁性,样品的比饱和磁化强度随着其中含量增加而增加;差热分析(TG-DTA)结果表明磁性水滑石的热分解特性与纯的水滑石热分解特性相似,磁性基质的引入没有改变水滑石热分解的特征;研究样品对溶液中磷离子吸附率,发现0.15 g 2#样品(Co^2+与Mg^2+摩尔比分别为1∶50)吸附时间为10~20 min时吸附效果最好。展开更多
CNTs with core-shell structure were successfully synthesized by a microwave-assisted polyol method,and magnetic Ni nanoparticles were employed as a catalyst. The preparation method is fast and simple. The structures,m...CNTs with core-shell structure were successfully synthesized by a microwave-assisted polyol method,and magnetic Ni nanoparticles were employed as a catalyst. The preparation method is fast and simple. The structures,morphology and magnetic properties of the as-synthesized samples were investigated using Raman spectrometer,X-ray diffraction (XRD),transmission electron microscopy (TEM),vibrating sample magnetometer (VSM),respectively. The XRD results suggested that Ni particles used as a catalyst in our experiment were nano-sized. In this paper,magnetic Ni nanoparticles were employed as a catalyst,and an electric spark on metal Ni nanoparticles with the microwave eddy current effect could induce CNTs’ formation with the further reaction. The length of hollow carbon nanotubes was micro-sized and the diameters of most of the CNTs were varying from 18 to 20 nm according to the TEM images. Magnetic measurements demonstrated that CNTs with core-shell structure indicated a characteristic ferromagnetic behavior compared with Ni nanoparticles.展开更多
文摘采用均匀共沉淀法制备了CoFe2O4含量不同的一组磁性水滑石(MgAl-LDHs-CoFe2O4),研究了MgAl-LDHsCoFe2O4晶体结构、微观形貌、磁性能、热稳定性及其对溶液中磷元素的吸收情况。X-射线衍射(XRD)图谱表明少量CoFe2O4的加入没有影响水滑石的结晶性能,磁性水滑石具有典型的水滑石特征峰,同时含有CoFe2O4特征峰;扫描电镜(SEM)图片显示采用均匀共沉淀法制备磁性水滑石是片层状结构,磁性基质CoFe2O4均匀地吸附在水滑石片层表面;磁性水滑石样品经振动样品磁强计(VSM)测试结果发现磁性水滑石具有铁磁性,样品的比饱和磁化强度随着其中含量增加而增加;差热分析(TG-DTA)结果表明磁性水滑石的热分解特性与纯的水滑石热分解特性相似,磁性基质的引入没有改变水滑石热分解的特征;研究样品对溶液中磷离子吸附率,发现0.15 g 2#样品(Co^2+与Mg^2+摩尔比分别为1∶50)吸附时间为10~20 min时吸附效果最好。
基金supported by the National Natural Science Foundation of China (Grant Nos.50672001,51072002)the "211" Project of Anhui University
文摘CNTs with core-shell structure were successfully synthesized by a microwave-assisted polyol method,and magnetic Ni nanoparticles were employed as a catalyst. The preparation method is fast and simple. The structures,morphology and magnetic properties of the as-synthesized samples were investigated using Raman spectrometer,X-ray diffraction (XRD),transmission electron microscopy (TEM),vibrating sample magnetometer (VSM),respectively. The XRD results suggested that Ni particles used as a catalyst in our experiment were nano-sized. In this paper,magnetic Ni nanoparticles were employed as a catalyst,and an electric spark on metal Ni nanoparticles with the microwave eddy current effect could induce CNTs’ formation with the further reaction. The length of hollow carbon nanotubes was micro-sized and the diameters of most of the CNTs were varying from 18 to 20 nm according to the TEM images. Magnetic measurements demonstrated that CNTs with core-shell structure indicated a characteristic ferromagnetic behavior compared with Ni nanoparticles.
