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<p>Developing efficient and environmentally friendly photocatalysts for dye degradation remains a significant challenge. In this study, we strengthened the ZnO-gC<sub>3</sub>N<sub>4</sub> (ZG) heterojunction photocatalyst by incorporating it into a crosslinked alginate hydrogel (CA), forming a novel Alg-based photocatalyst (CAZG). The CAZG demonstrated enhanced optical properties and improved photocatalytic degradation of methylene blue (MB) under UV-vis irradiation. The resulting materials (CA, ZG, and CAZG) were meticulously characterized via Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric analysis (TGA) and UV-vis Diffuse Reflectance spectroscopy (UV-vis DRS) techniques to determine their structural, thermal and optical properties. The photocatalytic performance of ZG and CAZG showed maximum MB degradation efficiencies of 65.34% and 73.46% respectively, at a concentration of 1 × 10<sup>−5 </sup>M after 60 min of UV-vis exposure. The integration of ZG (3.1 eV) into the alginate matrix resulted in a diminished bandgap structure for the CAZG (2.47 eV), enhancing optical properties and promoting photocatalytic activity. This study presents a sustainable approach to develop biocompatible and economically feasible photocatalysts for environmental applications.</p> Graphical Abstract <p></p>

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Synergistic role of alginate hydrogel in the photocatalytic activity of ZnO-gC3N4

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • MD Furqaan Valiyathur,
  • A. Ahmed Raza,
  • Anver Basha Kottur,
  • Mohammed Safiullah Sakvai

摘要

Developing efficient and environmentally friendly photocatalysts for dye degradation remains a significant challenge. In this study, we strengthened the ZnO-gC3N4 (ZG) heterojunction photocatalyst by incorporating it into a crosslinked alginate hydrogel (CA), forming a novel Alg-based photocatalyst (CAZG). The CAZG demonstrated enhanced optical properties and improved photocatalytic degradation of methylene blue (MB) under UV-vis irradiation. The resulting materials (CA, ZG, and CAZG) were meticulously characterized via Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric analysis (TGA) and UV-vis Diffuse Reflectance spectroscopy (UV-vis DRS) techniques to determine their structural, thermal and optical properties. The photocatalytic performance of ZG and CAZG showed maximum MB degradation efficiencies of 65.34% and 73.46% respectively, at a concentration of 1 × 10−5 M after 60 min of UV-vis exposure. The integration of ZG (3.1 eV) into the alginate matrix resulted in a diminished bandgap structure for the CAZG (2.47 eV), enhancing optical properties and promoting photocatalytic activity. This study presents a sustainable approach to develop biocompatible and economically feasible photocatalysts for environmental applications.

Graphical Abstract