好気性油相環状磁気吸着法による1次元FeO@TiOナノチューブ複合体の合成と可視光光光触媒分解性能の向上

Aerobic Oil-Phase Cyclic Magnetic Adsorption to Synthesize 1D FeO@TiO Nanotube Composites for Enhanced Visible-Light Photocatalytic Degradation.

• Qingqing Tao
• Xin Huang
• Jingtao Bi
• Rongli Wei
• Chuang Xie
• Yongzhu Zhou
• Lu Yu
• Hongxun Hao
• Jingkang Wang

抄録

本研究では、好気性油相環状磁気吸着法を用いて、千鳥配列を有するFeO@TiOナノ構造体を新規に設計した。XRD及びTEM解析を行い、TiOのナノチューブ内壁にFeOナノ粒子が均一に析出していることを確認した。定常分解実験の結果、1FeTiが最も優れた性能を有していることが示された。これは、満足のいく暗黒吸着能,効率的な光触媒活性,磁気分離の容易さ,経済性に起因すると考えられる。これらの結果から、TiOナノチューブへのFeOの析出はFeOの活性を著しく向上させることが明らかになった。最後に、浸出試験及び再生試験を実施した結果、TiO/FeOと比較して光分解が抑制され、安定した循環能力を示し、1FeTiは光触媒水浄化用磁性材料として有望であることを示した。

In this work, FeO@TiO nanostructures with staggered band alignment were newly designed by an aerobic oil-phase cyclic magnetic adsorption method. XRD and TEM analyses were performed to verify the uniform deposition of FeO nanoparticles on the nanotube inner walls of TiO. The steady-state degradation experiments exhibited that 1FeTi possessed the most superior performance, which might be ascribable to the satisfying dark adsorption capacity, efficient photocatalytic activity, ease of magnetic separation, and economic efficiency. These results indicated that the deposition of FeO into TiO nanotubes significantly enhanced the activity of FeO, which was mainly ascribed to the FeO-induced formation of staggered iron oxides@TiO band alignment and thus efficient separation of h and e. Furthermore, the PL intensity and lifetime of the decay curve were considered as key criterions for the activity's evaluation. Finally, the leaching tests and regeneration experiments were also performed, which illustrated the inhibited photodissolution compared with TiO/FeO and stable cycling ability, enabling 1FeTi to be a promising magnetic material for photocatalytic water remediation.