Dissertation
Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

The Preparation and Research of Magnetically Separable TiO2 Photocatalyst Nanofibers

Author ZhangLianLian
Tutor LiCongJu
School Beijing Institute of Clothing Technology
Course Materials Science
Keywords Electrospinning TiO2 Nanofiber Nanospheres Magnetism Photocatalysis
CLC TB383.1
Type Master's thesis
Year 2012
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Sr1-xLaxFe12-xCoxO19(x=00.5) ferrite nanofibers were successfully abtained by electrospinning technique. The samples, morphology, phases, structure and magnetic properties of the nanofibers were characterized by Scanning electron microscopy(SEM), Transmission electron microscope(TEM), X-ray diffraction(XRD) and Vibrating sample magnetometer(VSM). The results show that the samples have an uniform diameter of 80150 nm after being calcined at 800 oC. The substitution of La3+ and Co2+ obviously increases the magnetic properties of the as-prepared samples at x≤0.1, the coercivity(Hc) and remanent magnetization(Mr) of Sr0.9La0.1Fe11.9Co0.1O19 nanofiers correspondingly are 432.02 kA/m, 28.9 A·m2/kg, which were much enhanced compared to the Sr0.9La0.1Fe11.9Co0.1O19 powder sample.TiO2/Mn2O3 nanofibers were abtained by electrospinning methods. The TiO2/Mn2O3 nanofibers were characterized by SEM, TG-DTA, XRD and UV-Vis spectrophotometer. The results showed that it can be produced into TiO2/Mn2O3 nanofibers with a small diameter of 100 nm after calcination at 500°C. The incorporation of Mn2O3 into titania dioxide can significantly extend the absorption by the photocatalysts into visible range.On the base of above research, magnetically separable photocatalysis materials, La3+-TiO2/CoFe2O4 nanofibers and TiO2/SrFe12O19 nanospheres, were obtained by means of a novel two-spinneret electrospinning technique and sol-gel method. The photocatalysis materials were characterized by XRD、SEM、TEM and VSM respectively. The results show that, the <1.0% La-doped TiO2>/CoFe2O4 nanofibers have an efficient photocatalytic property, and the degradation rate of MB could reach 93% in 2.5 h. Moreover, the nanofibers show a good magnetic response. The average diameter of the TiO2/SrFe12O19 nanospheres is 300-700 nm after calcination. and the photodegradation ratio of MB by TiO2/SrFe12O19 nanospheres is up to 93% under irradiation for 2.5 h. The nanospheres has a large coercivity, indicating the possibility of those easy recycling property.

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