Ternary nanocomposite of ZnFe2O4/α-Fe2O3/ZnO; synthesis via coprecipitation method and physical properties characterization

Abstract

ZnFe2O4/α-Fe2O3/ZnO ternary transition metal oxides nanocomposite powder was successfully synthesized by facile coprecipitation method directly from metalorganic precursors within 4 hours processing time considerably shorter than other reported methods. To study post-synthesis thermal treatment effects on physical properties calcination process was applied at 500 °C, 600 °C and 700 °C individually in furnace for one hour. The structure, phase formation, morphology and optical features of the samples were characterized by means of powder X-ray diffraction, scanning electron microscopy and UV-Visible spectroscopy. The results show formation of pure and homogeneous composites comprised of nanoparticles with good crystallization in narrow range of crystallite size between 25 nm-39 nm. The particle sizes were also estimated to be in the range of 48 nm -93 nm. The optical property was studied by recording the absorbance spectrum in the range of 200 nm -700 nm. The absorption pattern illustrated that the product can be driven by both UV and visible wavelengths with a good efficiency which is more desirable for intended applications like photocatalytic activities compare to the individual components. By using Tauc's method the allowed direct band gap energy and indirect band gap energy of the prepared nanocomposite was estimated to be around 2.28 eV and 2.75 eV, respectively.

Biogenic Punica granatum Flower Extract Assisted ZnFe2O4 and ZnFe2O4-Cu Composites for Excellent Photocatalytic Degradation of RhB Dye

“…The bandgap energy was estimated using the application of the DRS Tauc method, which involves the utilization of the equation ( αhν ) γ = A (hν − Eg) . In this equation, α is the absorption coefficient, h is the Plank’s constant, ν is the frequency of photons, A is a proportionality constant, γ equal to 2 ( direct allowed transitions), and Eg is a band gap energy [ 80 , 81 ]. The bandgap energy is intercepted by extrapolating the horizontal y -axis (photon energy, hv ) against the x -axis, as shown in Figure 4 b–e.…”

A Comparative and Critical Analysis for In Vitro Cytotoxic Evaluation of Magneto-Crystalline Zinc Ferrite Nanoparticles Using MTT, Crystal Violet, LDH, and Apoptosis Assay

“…The evidence suggests optical transitions around 430 and 500 nm that are assigned to ( 6 A 1g → 4 T 2g (D)) and ( 6 A 1g → 4 A 1g (G)) transitions, respectively. The 550 nm band corresponds to O 2− + Fe 3+ → O − + Fe 2+ indirect transition [ 10 ]. Likewise, the obtained dark brown color of ZFO proved the visible light absorption capacity of these NPs [ 8 , 10 ].…”

“…01-089-4926 and 00-022-1012 as well as crystalline planes of (210), (211), (421), and (442), according to JCPDS pattern no. 00-039-1346 that corresponds to iron oxide (Fe 2 O 3 ) + Fe 3+ → O − + Fe 2+ indirect transition [ 10 ]. Likewise, the obtained dark brown color of ZFO proved the visible light absorption capacity of these NPs [ 8 , 10 ].…”

l-Methionine-Zr complex supported on magnetic ZnFe2O4 as a novel, green, and efficient heterogeneous magnetic nanocatalyst for the synthesis of 1H-tetrazole and polyhydroquinoline derivatives

“…As a main member of the ferrite family, ZnFe 2 O 4 is a promising potential for use as a novel catalytic support. 13,28,33,34 In addition, the surface hydroxyl groups of zinc ferrite facilitate its surface modification with a wide variety of organic compounds. 35,36…”

“…As a main member of the ferrite family, ZnFe 2 O 4 is a promising potential for use as a novel catalytic support. 13,28,33,34 In addition, the surface hydroxyl groups of zinc ferrite facilitate its surface modification with a wide variety of organic compounds. 35,36 ''Green chemistry'' has demonstrated how environmental problem-solving strategies can protect human health and the environment in an economically beneficial manner.…”