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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Highly mesoporous alpha-Fe2O3 nanostructures: preparation, characterization and improved photocatalytic performance towards Rhodamine B (RhB)
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Highly mesoporous alpha-Fe2O3 nanostructures: preparation, characterization and improved photocatalytic performance towards Rhodamine B (RhB)

机译：高介孔α-Fe2O3纳米结构：制备，表征和对罗丹明B（RhB）的改善的光催化性能

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摘要

Single-crystalline porous hematite nanorods and spindle-like nanostructures were successfully synthesized by a low temperature reflux condensation method. Two different iron sources, namely, FeCl3 center dot 6H(2)O and Fe(NO3)(3)center dot 9H(2)O, were hydrolyzed in the presence of urea to selectively prepare nanorods and spindle-like nanostructures. Initially, the akagenite phase was obtained by refluxing the precursor for 12 h and then the as-prepared akagenite nanostructures were transformed to porous hematite nanostructures upon calcination at 300 degrees C for 1 h. The shape and the aspect ratio of the 12 h refluxed sample was retained even after calcination and this shows the topotactic transformation of the nanostructure. TEM and HRTEM investigations have shown the porous nature of the prepared sample. Brunauer-Emmett-Teller and Barret-Joyner-Halenda measurements have shown a large surface area and distribution of mesopores in the nanorods sample. The photocatalytic activity of the prepared nanostructures towards RhB has reflected this variation in the pore size distribution and specific surface area, by showing a higher activity for the nanorods sample. Magnetic studies by VSM have shown a weak ferromagnetic behaviour in both the samples due to shape anisotropy.
机译：通过低温回流冷凝法成功地合成了单晶多孔赤铁矿纳米棒和纺锤状纳米结构。两种不同的铁源，即FeCl3中心点6H（2）O和Fe（NO3）（3）中心点9H（2）O在尿素存在下进行水解，以选择性地制备纳米棒和纺锤状纳米结构。最初，通过将前体回流12小时获得了赤铁矿相，然后在300摄氏度下煅烧1 h后，将制得的赤铁矿纳米结构转变为多孔赤铁矿纳米结构。甚至在煅烧后，仍保留了12 h回流样品的形状和长宽比，这表明了纳米结构的全同立构转变。 TEM和HRTEM研究表明所制备样品的多孔性。 Brunauer-Emmett-Teller和Barret-Joyner-Halenda的测量结果表明，纳米棒样品中有较大的表面积和中孔分布。制备的纳米结构对RhB的光催化活性通过显示出对纳米棒样品更高的活性，反映了孔径分布和比表面积的这种变化。 VSM的磁性研究表明，由于形状各向异性，两个样品中的铁磁性能都很弱。

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