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<p>In this study, mixed anatase and rutile phase of TiO<sub>2</sub> nanotubes (TNTs) and Au/TNTs were successfully synthesized through a hydrothermal method at 135&#xa0;°C for 24&#xa0;h and a photoreduction process by UV light irradiation, respectively. The characterizations of materials were conducted using XRD, FTIR, and UV–Vis DRS techniques. The synthesized TNTs and Au/TNTs had a tube-like morphology with average lengths of 100–200&#xa0;nm and diameters of 8–10&#xa0;nm. The TNTs crystal with a mixed anatase and rutile phase exhibited significantly enhanced photocatalytic performance when decorated with Au nanoparticles, compared to the pure phase. In detail, the NO<sub>x</sub> gas removal efficiency of bare TNTs and Au/TNTs was 45.86% and 69.58%, respectively. The high stability of Au/TNTs was demonstrated by the stability of photocatalytic performance for five recycling tests. The NO<sub>x</sub> gas degradation mechanism and intermediate products over Au/TNTs were proposed to understand the reaction process.</p> Graphical Abstract <p></p>

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Enhancing NOx Photocatalytic Degradation of Mixed Anatase and Rutile Phase of TiO2 Nanotubes by Decorating Au Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • Hoa Cong Nguyen,
  • Tien-Thanh Nguyen,
  • Trang Thi Thuy Le,
  • Thi Minh Cao,
  • Viet Van Pham

摘要

In this study, mixed anatase and rutile phase of TiO2 nanotubes (TNTs) and Au/TNTs were successfully synthesized through a hydrothermal method at 135 °C for 24 h and a photoreduction process by UV light irradiation, respectively. The characterizations of materials were conducted using XRD, FTIR, and UV–Vis DRS techniques. The synthesized TNTs and Au/TNTs had a tube-like morphology with average lengths of 100–200 nm and diameters of 8–10 nm. The TNTs crystal with a mixed anatase and rutile phase exhibited significantly enhanced photocatalytic performance when decorated with Au nanoparticles, compared to the pure phase. In detail, the NOx gas removal efficiency of bare TNTs and Au/TNTs was 45.86% and 69.58%, respectively. The high stability of Au/TNTs was demonstrated by the stability of photocatalytic performance for five recycling tests. The NOx gas degradation mechanism and intermediate products over Au/TNTs were proposed to understand the reaction process.

Graphical Abstract