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<p>This study examines how changing the pH engineering, as a green and simple strategy, morphological, optical, and photocatalytic properties of titanium dioxide nanoparticles (TiO<sub>2</sub>). The Debye–Scherrer equation yields an average crystalline size of 13–16&#xa0;nm at pH values of 2, 5, 9, and 12. The average particle size of TiO<sub>2</sub> nanoparticles measured by HR-TEM was 15&#xa0;nm. The photocatalytic test requires adjusting several factors, including the time of the light exposure, the initial dye concentration, the pH, and the amount of catalyst used to break down the malachite green (MG). When exposed to visible light, the maximum malachite green dye removal rate (98.14%) is obtained with 100&#xa0;ppm dye concentration, pH-12, and 0.05&#xa0;g catalyst in 250&#xa0;mL of malachite green dye solution over 240&#xa0;min. The photostability and reusability of the synthesized photocatalyst are also tested.</p>

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pH-engineered TiO2 nanoparticles with enhanced photocatalytic degradation of malachite green

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • R. Sarathi,
  • N. L. Sheeba,
  • S. Meenakshi Sundar,
  • Mohammad Ahmad Wadaan,
  • Sandhanasamy Devanesan,
  • M. Sherlin Nivetha,
  • A. Krishna Prakash,
  • J. Vinoth Kumar

摘要

This study examines how changing the pH engineering, as a green and simple strategy, morphological, optical, and photocatalytic properties of titanium dioxide nanoparticles (TiO2). The Debye–Scherrer equation yields an average crystalline size of 13–16 nm at pH values of 2, 5, 9, and 12. The average particle size of TiO2 nanoparticles measured by HR-TEM was 15 nm. The photocatalytic test requires adjusting several factors, including the time of the light exposure, the initial dye concentration, the pH, and the amount of catalyst used to break down the malachite green (MG). When exposed to visible light, the maximum malachite green dye removal rate (98.14%) is obtained with 100 ppm dye concentration, pH-12, and 0.05 g catalyst in 250 mL of malachite green dye solution over 240 min. The photostability and reusability of the synthesized photocatalyst are also tested.