Inorganic Chemistry Communications

Noua A. E., Kaya D., Siğircik G., Tüken T., Karadağ F., Ekicibil A.

INORGANIC CHEMISTRY COMMUNICATION, cilt.177, sa.114388, ss.1-11, 2025 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 177 Sayı: 114388
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.inoche.2025.114388
  • Dergi Adı: INORGANIC CHEMISTRY COMMUNICATION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, Chimica, DIALNET
  • Sayfa Sayıları: ss.1-11
  • Çukurova Üniversitesi Adresli: Evet

Özet

In this study, photocatalytic and magnetic Ni (metal)/NiO (metal oxide) nanoparticles (NPs) were synthesized and coated with small amounts of Pt (1, 3, and 5 %) using a modified polyol process. The X-ray diffraction results confirmed that the Ni/NiO NPs exhibited a mixed cubic phase of Ni and NiO after calcination at 600 °C for 1 h. After loading 1 %, 3 %, and 5 % Pt onto the Ni/NiO surface, broad Pt peaks became visible in the XRD for the 5 % Pt sample, indicating the formation of a separate crystalline Pt phase. Scanning electron microscopy and energy-dispersive X-ray spectroscopy analyses revealed an average particle size of approximately 30 nm, confirming impurity-free synthesis. All samples demonstrated enhanced adsorption capabilities, with the 3 % Pt-loaded Ni/NiO sample removing up to 60 % of methylene blue within 1 h under sunlight. The 5 % Pt-loaded Ni/NiO exhibited the highest photocatalytic performance, achieving a rate constant of 0.01779 min−1 and a degradation efficiency of approximately 91 %. This improvement is attributed to the role of Pt in facilitating charge separation and acting as an electron sink, which suppresses charge carrier recombination. Additionally, Pt increases the number of active sites, further improving photocatalytic efficiency. Magnetization vs. temperature measurements indicated that increasing the Pt content from 1 % to 5 % reduced the total magnetization owing to the paramagnetic contribution of Pt in the Ni/NiO structure. The highest coercivity, exchange bias, saturation magnetization, and remanent magnetization values for Ni/NiO sample were determined from hysteresis loops at 5 K, measuring 389.6 Oe, 28.1 Oe, 4.91 emu/g and 1.58 emu/g, respectively. These results highlight the potential of Pt-deposited Ni/NiO NPs to improve adsorption and photocatalytic activity, offering valuable insights for pollutant degradation and magnetically recoverable nanocatalysis of environmental remediation applications.