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<p>Industrial wastewater pollution arising from organic dyes and toxic heavy metal ions represents a serious environmental and public health challenge, demanding sustainable and multifunctional remediation strategies. In this study, NiO-SnO<sub>2</sub> nanocomposites (NCs) were synthesized via an eco-friendly green solution combustion route using ground nut powder as a bio-derived fuel and systematically explored for environmental and luminescent applications. The resulting materials were comprehensively characterized using XRD, FT-IR, UV-DRS, SEM, TEM, and PL techniques, confirming their crystalline heterostructure, nanoscale morphology, and visible light activity. Among the different compositions, the 1:0.5 NiO-SnO<sub>2</sub> NCs sample demonstrated superior photocatalytic performance toward visible-light-driven Rhodamine B (RdB) dye degrading and hexavalent chromium (Cr(VI)) reduction, governed by the surface charge near the point of zero charge (pH<sub>PZC</sub>=8.35). The NiO-SnO<sub>2</sub> NCs exhibited excellent reusability across multiple cycles. Beyond, these NCs showed strong photo-luminescence and high colour purity, enabling their application in latent fingerprint detection. This dual functionality illustrates the potential of NiO-SnO<sub>2</sub> NCs as eco-friendly, multifunctional materials suitable for both environmental and forensic applications, contributing to sustainable waste management and advanced biometric identification.</p> Graphical Abstract <p></p>

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“Eco-Friendly Fabrication of NiO–SnO₂ Heterostructures for Photoluminescent, Photocatalytic and Forensic Applications”

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Gagana G R.,
  • Harini R.,
  • Devaraja S.,
  • Mohd Shkir,
  • Rajashekhara S.,
  • Madhuri D. R.,
  • G. Venkatesha,
  • Nagaraju G.

摘要

Industrial wastewater pollution arising from organic dyes and toxic heavy metal ions represents a serious environmental and public health challenge, demanding sustainable and multifunctional remediation strategies. In this study, NiO-SnO2 nanocomposites (NCs) were synthesized via an eco-friendly green solution combustion route using ground nut powder as a bio-derived fuel and systematically explored for environmental and luminescent applications. The resulting materials were comprehensively characterized using XRD, FT-IR, UV-DRS, SEM, TEM, and PL techniques, confirming their crystalline heterostructure, nanoscale morphology, and visible light activity. Among the different compositions, the 1:0.5 NiO-SnO2 NCs sample demonstrated superior photocatalytic performance toward visible-light-driven Rhodamine B (RdB) dye degrading and hexavalent chromium (Cr(VI)) reduction, governed by the surface charge near the point of zero charge (pHPZC=8.35). The NiO-SnO2 NCs exhibited excellent reusability across multiple cycles. Beyond, these NCs showed strong photo-luminescence and high colour purity, enabling their application in latent fingerprint detection. This dual functionality illustrates the potential of NiO-SnO2 NCs as eco-friendly, multifunctional materials suitable for both environmental and forensic applications, contributing to sustainable waste management and advanced biometric identification.

Graphical Abstract