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Adjusting phase transition of titania-based nanotubes via hydrothermal and post treatment

机译:通过水热和后处理调节钛基纳米管的相转变

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摘要

Titania-based nanotubes are prepared via hydrothermal and post treatment of titania with different anatase/rutile ratios. Commerical TiO2 P25 with an anatase/rutile ratio of 80/20 changes to sodium titanate, hydrogen titanate and anatase after hydrothermal treatment at 130 ~C over 2 h, ion exchange bywashingwithwater and calcination at 400 ~C for 5 h. The final tubular structure has a lot of defects owing to a great quantity of dehydration. Pure rutile is more stable than P25. Lamellars exfoliate from (110) facets of rutile at 130 ~C hydrothermal treatment to roll up into nanotubes. Only a small amount of rutile transfers to amorphous sodium titanate within 24 h, and it recrystallizes on the surface of nanotubes and results in a perfect tubular structure with a small amount of dehydration. The dissolution- recrystallization mechanism plays an important role in the composition and crystal structure of titania-based nanotubes.
机译:基于二氧化钛的纳米管通过水热量制备,并用不同的锐钛矿/金红石比例进行二氧化钛。 锐钛矿/金红石比例为80/20的锐钛矿/金红石比,钛酸钠,钛酸盐和锐钛矿在130℃下,在2小时内,离子交换通过在400℃下煅烧5小时。 由于大量的脱水,最终管状结构具有很多缺陷。 纯金红石比P25更稳定。 在130℃的水热处理中,拉链从金红石的刻面剥离,卷入纳米管中。 只有少量的金属丝石转移到24小时内的无定形钠钠,并且它在纳米管的表面上重结晶并导致具有少量脱水的完美管状结构。 溶解 - 重结晶机制在钛基纳米管的组成和晶体结构中起重要作用。

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  • 来源
    《RSC Advances》 |2015年第109期|共6页
  • 作者单位

    School of Chemical and Biological Engineering Taiyuan University of Science and Technology Taiyuan 030024 China.;

    School of Chemical and Biological Engineering Taiyuan University of Science and Technology Taiyuan 030024 China.;

    School of Chemical and Biological Engineering Taiyuan University of Science and Technology Taiyuan 030024 China.;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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