Influence of Fe doping on phase transformation and crystallite growth of electrospun TiO2 nanofibers for photocatalytic reaction
Influence of Fe doping on phase transformation and crystallite growth of electrospun TiO2 nanofibers for photocatalytic reaction
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DOI：
10.1016/j.matlet.2012.07.080
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发表时间：
2012-12
影响因子：
3
通讯作者：
Ju-Young Park;Jae-Hyeok Lee;D. Choi;Cheol-Ho Hwang;Jae‐Wook Lee
中科院分区：
文献类型：
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作者：
Ju-Young Park;Jae-Hyeok Lee;D. Choi;Cheol-Ho Hwang;Jae‐Wook Lee
以聚乙烯吡咯烷和异丙醇钛为前驱体，采用静电纺丝技术制备了Fe掺杂的TiO2纳米纤维。随着煅烧温度的升高，TiO2纳米纤维的晶粒尺寸增大。Fe掺杂的TiO2纳米纤维的晶粒比纯TiO2纳米纤维的晶粒大，因为Fe促进了相变。Fe控制了相变过程，同时也影响了微晶的生长。以亚甲基蓝在紫外光下的光分解反应为指标，考察了催化剂的光催化活性. Fe掺杂的TiO2纳米纤维比纯TiO2纳米纤维更有效地光催化降解亚甲基蓝。光催化降解速率符合准一级动力学方程。纯TiO2纳米纤维和掺杂0.5% Fe的TiO2纳米纤维的速率常数分别为0.276和0.570。
Fe-doped TiO2nanofibers were fabricated by an electrospinning technique using poly(vinylpyrrolidine) and titanium isopropoxide as precursors. When the calcination temperature was increased, the crystallite size of the TiO2nanofibers increased. The Fe-doped TiO2nanofiber crystallites were larger than those of pure TiO2nanofibers because Fe promotes phase transformation. Fe controlled the phase transformation and also affected the growth of anatase crystallites. The photocatalysts were evaluated using the photodecomposition of methylene blue under UV light. Fe-doped TiO2nanofibers were found to be more efficient than pure TiO2nanofibers for photocatalytic degradation of methylene blue. The photocatalytic degradation rate fitted a pseudo-first-order equation. The rate constants of pure TiO2nanofibers and 0.5%-Fe-doped TiO2nanofibers were 0.276 and 0.570, respectively.