Akademik Veri Yönetim Sistemi
Solid State Communications, cilt.409, 2026 (SCI-Expanded, Scopus)
In this work, nickel-based spinel oxides with the general formula NiB2O4 (B = Co, Fe, and Al) were synthesized via a facile combustion method to explore the role of B-site cations in tuning their physical and photocatalytic behavior. The main properties and oxidation states of the samples were comprehensively examined using various characterization tools, including X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), UV–visible spectroscopy, and X-ray photoelectron spectroscopy (XPS). The structural study by XRD affirmed the formation of crystal spinel phases for NiCo2O4, NiFe2O4 and NiAl2O4 with a mean crystallite size between 22 and 44 nm. Morphological SEM images well defined the spherical and nanosized grain crystals for all the samples. BET analysis further indicated that NiFe2O4 possesses a high specific surface area of 78 m2 g−1 and a pore width of 11.5 nm. The optical results showed that the obtained samples have an energy bandgap (Eg) value of 2.25, 1.73, and 2.24 eV for NiCo2O4, NiFe2O4, and NiAl2O4, respectively. The synthesized spinel oxides were evaluated as photocatalysts under UV light for the degradation of methylene blue dye (MB) and 4-nitrophenol(4-NP). The photodegradation results show that NiFe2O4 spinel exhibits the high rates with an efficiency of 86.65 % for MB within 80 min and a conversion rate of 70 % for 4-NP in only 15 min.