NiFe2O4 dopeded with magnetic titanate nanotubes(MTNT)were prepared by a hydrothermal method using magnetic nanoparticles TiO2/SiO2/NiFe2O4 as the precursor.The effects of hydrothermal temperatures on their compositio...NiFe2O4 dopeded with magnetic titanate nanotubes(MTNT)were prepared by a hydrothermal method using magnetic nanoparticles TiO2/SiO2/NiFe2O4 as the precursor.The effects of hydrothermal temperatures on their composition,morphologies and magnetic properties of products were characterized by transmission electron microscopy(TEM),scanning electron microscopy(SEM),X-ray diffraction(XRD),vibration sample magnetometer(VSM)and energy dispersive X-ray spectroscopy(EDS).The results show that the hydrothermal temperature has a significant impact on the morphology of the products.The MTNT is synthesized in the temperature range of 120-160 ℃ and the inner diameter of MTNT is about 3-10 nm,the wall thickness 4-12nm and the length 100-200 nm.The components of MTNT are Na0.8H1.2Ti3O7 and a little of anatase TiO2 and NiFe2O4.The ferrimagnetisms and magnetic hysteresis phenomena are shown in the prepared MTNT.The hydrothermal temperature has no clear effect on the magnetic properties in the range of 120-180 ℃.The visible-light photo-catalytic activity of the products decreases as the temperature increases.The decolorization of methylene blue is 94.6% by the MTNT obtained at 120 ℃ and the recovery rate of MTNT is more than 95 percent.The MTNT has excellent photocatalytic activity and is easy to recovery.展开更多
采用水热法制备了稀土元素钕掺杂的钛酸钡与碳纳米管（CNTs）的复合吸波材料。利用红外光谱（IR）、X-射线衍射仪（XRD）及能谱仪（EDS）测试了样品的结构与成分,并采用透射电子显微镜（TEM）对样品的形貌进行了表征。考察了Nd掺杂及不...采用水热法制备了稀土元素钕掺杂的钛酸钡与碳纳米管（CNTs）的复合吸波材料。利用红外光谱（IR）、X-射线衍射仪（XRD）及能谱仪（EDS）测试了样品的结构与成分,并采用透射电子显微镜（TEM）对样品的形貌进行了表征。考察了Nd掺杂及不同的CNTs复合量对复合材料在低频区（0-6 000 MHz）吸波性能的影响。结果表明,Nd掺杂后钛酸钡的吸波性能得到一定的提升,随着CNTs复合量的增加,吸收峰的位置先向低频移动后又移向高频。当CNTs含量为7%时,复合材料在频率为4 270.8 MHz处出现了-13.5 d B的最强吸收峰,〈-5 d B的频宽达520.8 MHz。展开更多
文摘NiFe2O4 dopeded with magnetic titanate nanotubes(MTNT)were prepared by a hydrothermal method using magnetic nanoparticles TiO2/SiO2/NiFe2O4 as the precursor.The effects of hydrothermal temperatures on their composition,morphologies and magnetic properties of products were characterized by transmission electron microscopy(TEM),scanning electron microscopy(SEM),X-ray diffraction(XRD),vibration sample magnetometer(VSM)and energy dispersive X-ray spectroscopy(EDS).The results show that the hydrothermal temperature has a significant impact on the morphology of the products.The MTNT is synthesized in the temperature range of 120-160 ℃ and the inner diameter of MTNT is about 3-10 nm,the wall thickness 4-12nm and the length 100-200 nm.The components of MTNT are Na0.8H1.2Ti3O7 and a little of anatase TiO2 and NiFe2O4.The ferrimagnetisms and magnetic hysteresis phenomena are shown in the prepared MTNT.The hydrothermal temperature has no clear effect on the magnetic properties in the range of 120-180 ℃.The visible-light photo-catalytic activity of the products decreases as the temperature increases.The decolorization of methylene blue is 94.6% by the MTNT obtained at 120 ℃ and the recovery rate of MTNT is more than 95 percent.The MTNT has excellent photocatalytic activity and is easy to recovery.
文摘采用水热法制备了稀土元素钕掺杂的钛酸钡与碳纳米管（CNTs）的复合吸波材料。利用红外光谱（IR）、X-射线衍射仪（XRD）及能谱仪（EDS）测试了样品的结构与成分,并采用透射电子显微镜（TEM）对样品的形貌进行了表征。考察了Nd掺杂及不同的CNTs复合量对复合材料在低频区（0-6 000 MHz）吸波性能的影响。结果表明,Nd掺杂后钛酸钡的吸波性能得到一定的提升,随着CNTs复合量的增加,吸收峰的位置先向低频移动后又移向高频。当CNTs含量为7%时,复合材料在频率为4 270.8 MHz处出现了-13.5 d B的最强吸收峰,〈-5 d B的频宽达520.8 MHz。
