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<p>The pore structure characteristics of nano-TiO<sub>2</sub> cement paste are critical in determining its photocatalytic efficiency. In this study, the composition of the cement paste was modified to optimize the pore structure and examine its effect on photocatalytic performance. Mercury intrusion porosimetry (MIP) was utilized to characterize the pore structure of nano-TiO<sub>2</sub> cement paste, revealing that material composition significantly influences the pore structure. Photocatalytic degradation tests using methylene blue (MB) demonstrated that degradation efficiency improved with an increased water-to-binder ratio (<i>W</i>/<i>B</i>) and higher dosages of fly ash (FA) and air-entraining agent (AEA). The presence of transitional pores (10–50&#xa0;nm) and capillary pores (50–1000&#xa0;nm), as well as increased porosity and total pore volume, enhanced photocatalytic efficiency, while the pore surface fractal dimension showed minimal impact. Kinetic modeling and scanning electron microscopy (SEM) analyses confirmed that MB degradation by nano-TiO<sub>2</sub> cement paste follows a first-order kinetic model. Additionally, in the paste containing 0.012% AEA, the C-S–H gel exhibited a looser, network-like morphology, significantly improving photocatalytic activity.</p>

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Study on influence of pore structure on photocatalytic performance of nano-TiO2 cement paste

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Xueli Nan,
  • Jiang Fan,
  • Jianrui Ji,
  • Shuo Wang,
  • Mengge Zhu,
  • Weibin Tang

摘要

The pore structure characteristics of nano-TiO2 cement paste are critical in determining its photocatalytic efficiency. In this study, the composition of the cement paste was modified to optimize the pore structure and examine its effect on photocatalytic performance. Mercury intrusion porosimetry (MIP) was utilized to characterize the pore structure of nano-TiO2 cement paste, revealing that material composition significantly influences the pore structure. Photocatalytic degradation tests using methylene blue (MB) demonstrated that degradation efficiency improved with an increased water-to-binder ratio (W/B) and higher dosages of fly ash (FA) and air-entraining agent (AEA). The presence of transitional pores (10–50 nm) and capillary pores (50–1000 nm), as well as increased porosity and total pore volume, enhanced photocatalytic efficiency, while the pore surface fractal dimension showed minimal impact. Kinetic modeling and scanning electron microscopy (SEM) analyses confirmed that MB degradation by nano-TiO2 cement paste follows a first-order kinetic model. Additionally, in the paste containing 0.012% AEA, the C-S–H gel exhibited a looser, network-like morphology, significantly improving photocatalytic activity.