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<p>The rapid growth in electronic waste (e-waste) and the escalating pollution of wastewater are pressing global concerns necessitating sustainable solutions. This study focuses on the synthesis and characterization of Ni doped PPy/TiO2 Nanocomposites (NCs) emphasizing their potential for both photodegradation and electrolytic degradation applications within the context of managing e-waste. Ni nanoparticles (NPs) were extracted from discarded batteries, while TiO2-NPs were green-synthesized from sugarcane husk, aligning with sustainable practices. Polypyrrole (PPy) served as a conductive matrix for these NCs. Comprehensive characterization of Ni/PPy/TiO2-NCs and PPy/TiO2-NCs via UV-Vis spectroscopy, XRD, FT-IR, TGA, EDX, TEM and electrical conductivity measurements confirmed the formation and properties of both NCs. Notably, the Ni/PPy/TiO2-NCs displayed a diminished optical band gap (Eg) of 2.12&#xa0;eV and a crystallite size of 22.69&#xa0;nm indicative of their robust thermal stability with 25.1% char residue at 1000&#xa0;°C. Additionally, they exhibited ohmic behaviour and augmented DC conductivity (3.25 at 100&#xa0;V) compared to their constituent elements, hinting at their promising electronic applications. The nanocomposites demonstrated superior photocatalytic activity under sunlight, degrading 99.5% of Rose Bengal dye within 4&#xa0;min compared to 79.57% achieved by TiO2 alone. Additionally, Ni/PPy/TiO2-NCs exhibited excellent electrochemical degradation efficiency, completely eliminating the RB redox peak within 30&#xa0;min. These results underscore the dual-mode degradation capability of Ni/PPy/TiO2-NCs, positioning them as promising candidates for sustainable environmental remediation strategies. This study highlights the potential of these nanocomposites to address both e-waste management and wastewater treatment challenges effectively.</p> Graphical Abstract <p></p>

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Revitalizing Battery Waste: Unveiling Ni/PPy/TiO2-Nanocomposites for Dye Degradation

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Chitranjan Bharti,
  • Anjul Singh,
  • Vidivay,
  • Shruti Baghel,
  • Keshari Nandan

摘要

The rapid growth in electronic waste (e-waste) and the escalating pollution of wastewater are pressing global concerns necessitating sustainable solutions. This study focuses on the synthesis and characterization of Ni doped PPy/TiO2 Nanocomposites (NCs) emphasizing their potential for both photodegradation and electrolytic degradation applications within the context of managing e-waste. Ni nanoparticles (NPs) were extracted from discarded batteries, while TiO2-NPs were green-synthesized from sugarcane husk, aligning with sustainable practices. Polypyrrole (PPy) served as a conductive matrix for these NCs. Comprehensive characterization of Ni/PPy/TiO2-NCs and PPy/TiO2-NCs via UV-Vis spectroscopy, XRD, FT-IR, TGA, EDX, TEM and electrical conductivity measurements confirmed the formation and properties of both NCs. Notably, the Ni/PPy/TiO2-NCs displayed a diminished optical band gap (Eg) of 2.12 eV and a crystallite size of 22.69 nm indicative of their robust thermal stability with 25.1% char residue at 1000 °C. Additionally, they exhibited ohmic behaviour and augmented DC conductivity (3.25 at 100 V) compared to their constituent elements, hinting at their promising electronic applications. The nanocomposites demonstrated superior photocatalytic activity under sunlight, degrading 99.5% of Rose Bengal dye within 4 min compared to 79.57% achieved by TiO2 alone. Additionally, Ni/PPy/TiO2-NCs exhibited excellent electrochemical degradation efficiency, completely eliminating the RB redox peak within 30 min. These results underscore the dual-mode degradation capability of Ni/PPy/TiO2-NCs, positioning them as promising candidates for sustainable environmental remediation strategies. This study highlights the potential of these nanocomposites to address both e-waste management and wastewater treatment challenges effectively.

Graphical Abstract