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<p>This study evaluates the photocatalytic and adsorptive performance of hydrotalcite (HT), titanium dioxide (TiO<sub>2</sub>), and HT–TiO<sub>2</sub> composites for the degradation of methylene blue in aqueous solution. HT exhibited the highest adsorption capacity, followed by HT–TiO<sub>2</sub> composites, with TiO<sub>2</sub> showing the lowest performance. Adsorption followed the Langmuir isotherm model, indicating a homogeneous surface. Under UV irradiation, photocatalytic efficiency improved for all materials, with HT–TiO<sub>2</sub> composites showing superior performance. The addition of hydrogen peroxide further enhanced degradation, particularly in combination with UV light. The results suggest that combining photocatalysis and oxidation processes effectively degrades methylene blue, with HT–TiO<sub>2</sub> composites showing strong potential for environmental applications. This synergistic effect is attributed to the enhanced generation of reactive oxygen species (ROS), such as hydroxyl radicals (·OH), when UV irradiation activates the photocatalyst and simultaneously decomposes hydrogen peroxide. These ROS accelerate the breakdown of methylene blue molecules, resulting in higher degradation rates and shorter treatment times compared to individual processes.</p> Graphical abstract <p></p>

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Photocatalytic and adsorptive degradation of methylene blue using hydrotalcite- and TiO2-based composites

  • 期刊论文

  • 发表日期：

    2025年7月6日

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  • Andressa Franco Denti,
  • Gabriela Mesquita Bruel,
  • Alexander Junges,
  • Juliana Steffens,
  • Rogério Marcos Dallago

摘要

This study evaluates the photocatalytic and adsorptive performance of hydrotalcite (HT), titanium dioxide (TiO2), and HT–TiO2 composites for the degradation of methylene blue in aqueous solution. HT exhibited the highest adsorption capacity, followed by HT–TiO2 composites, with TiO2 showing the lowest performance. Adsorption followed the Langmuir isotherm model, indicating a homogeneous surface. Under UV irradiation, photocatalytic efficiency improved for all materials, with HT–TiO2 composites showing superior performance. The addition of hydrogen peroxide further enhanced degradation, particularly in combination with UV light. The results suggest that combining photocatalysis and oxidation processes effectively degrades methylene blue, with HT–TiO2 composites showing strong potential for environmental applications. This synergistic effect is attributed to the enhanced generation of reactive oxygen species (ROS), such as hydroxyl radicals (·OH), when UV irradiation activates the photocatalyst and simultaneously decomposes hydrogen peroxide. These ROS accelerate the breakdown of methylene blue molecules, resulting in higher degradation rates and shorter treatment times compared to individual processes.

Graphical abstract