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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
Downloads: 13
Quote: 0
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Abstract


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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