材料科学

由非晶态氢氧化钛水热合成氧化钛纳米管及其光催化性能研究

  • 凯丽 ,
  • 汪丽娜 ,
  • 史志铭
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  • 1. 内蒙古工业大学 材料科学与工程学院,呼和浩特 010051;
    2. 赤峰学院 物理与智能制造学院,赤峰 024000;
    3. 内蒙古财经大学 学生工作处,呼和浩特 010051

收稿日期: 2021-07-18

  网络出版日期: 2022-11-10

基金资助

史志铭,教授,E-mail:shizm@imut.edu.cn

Hydrothermal synthesis and photocatalytic properties of titania nanotubes synthesized from amorphous titanium hydroxide

  • KAI Li ,
  • WANG Lina ,
  • SHI Zhiming
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  • 1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
    2. School of Physics and Intelligent Manufacturing Engineering, Chifeng University, Chifeng 024000, China;
    3. Students' Affairs Office, Inner Mongolia University of Finance and Economics, Hohhot 010051, China

Received date: 2021-07-18

  Online published: 2022-11-10

摘要

氧化钛(TiO2)纳米管的合成方法对其微结构及光催化性能有很大影响。目前,大多数研究主要以锐钛矿晶体或锐钛矿与金红石的混合晶体合成纳米管为研究对象。为考查前驱体对TiO2纳米管形成过程及光催化性能的影响,该文研究了以非晶态氢氧化钛(Ti(OH)4)为钛源水热合成TiO2纳米管的工艺,分析了水热合成产物在后处理过程中物相和形貌的演变,并对TiO2纳米管的物理化学性质进行了表征。研究结果表明:水热合成的最佳温度和时间分别为150 ℃和16 h;对产物依次水洗、酸洗、再水洗,最后在400 ℃煅烧2 h,获得结晶度好的锐钛矿纳米管。转变过程为水热反应诱发了非晶态Ti(OH)4转变为薄片状钛酸钠(Na2Ti3O7);水洗和酸洗诱发了Na2Ti3O7向钛酸(H2Ti4O9)纳米管的转变;煅烧促进H2Ti4O9纳米管向锐钛矿纳米管的转变。400 ℃煅烧2 h的纳米管具有最高的光催化降解性能。

本文引用格式

凯丽 , 汪丽娜 , 史志铭 . 由非晶态氢氧化钛水热合成氧化钛纳米管及其光催化性能研究[J]. 清华大学学报(自然科学版), 2022 , 62(12) : 2035 -2042 . DOI: 10.16511/j.cnki.qhdxxb.2022.25.047

Abstract

The nanotube synthesis process greatly influences the microstructure and photocatalytic characteristics of titania (TiO2) nanotubes. Most studies have synthesized nanotubes using anatase crystals or mixtures of anatase and rutile crystals. This study investigated the effect of the precursor on the formation of TiO2 nanotubes and on their photocatalytic properties by using hydrothermal synthesis of TiO2 nanotubes using amorphous titanium hydroxide (Ti(OH)4) as the titanium source. This study then analyzed the phase evolution and the morphology of the hydrothermal synthesized products and characterized the physical and chemical properties of the TiO2 nanotubes. The results show that the optimal temperature for the hydrothermal synthesis is 150 ℃ for 16 h. The hydrothermal product was first washed with water, then acid, and then with water again. The product was then calcined at 400 ℃ for 2 h to produce anatase nanotubes with good crystallinity. The hydrothermal reaction induced the amorphous Ti(OH)4 to transform into thin-flake sodium titanate (Na2Ti3O7). Then, the Na2Ti3O7 was transformed to titanate (H2Ti4O9) nanotubes induced by washing with water and acid. Finally, the calcination promoted conversion of the H2Ti4O9 nanotubes to anatase nanotubes. The greatest photocatalytic degradation occurred when the nanotubes were calcined at 400 ℃ for 2 h.

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