The Synthesis of α-MoO3 by Ethylene Glycol

Abstract

This study investigated the use of ethylene glycol to form α-MoO3 (molybdenum trioxide) from ammonium molybdate tetrahydrate at various sintering temperatures for 1 h. During the sintering process, the morphologies of the constituents were observed using scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy was used to explain the reaction process. In this work, the results obtained using X-ray photoelectron spectroscopy (XRD) demonstrated that, when the molybdenum trioxide powder was treated thermally at 300 °C, the material exhibited crystallinity. The peaks were indexed to correspond with the (110), (040), (021), (111), and (060) crystallographic planes, and the lattice parameters of a, b, and c were about 3.961, 13.876, and 3.969 Å. Using these observations, we confirmed that orthorhombic α-MoO3 was formed for sintering temperatures from 300 to 700 °C. Pattern images were obtained by the selected area electron diffraction pattern (SAED) technique, and the d distance of the high resolution transmission electron microscopy (HRTEM) images were almost 0.39 and 0.36 nm, and the Mo 3d5/2, Mo 3d3/2, and O 1s of X-ray photoelectron spectroscopy (XPS) were located at 233.76, 237.03, and 532.19 eV, which also demonstrated that α-MoO3 powder had been synthesized.

Enhanced photodegradation activity of methyl orange over Z-scheme type MoO3–g-C3N4 composite under visible light irradiation

“…13 Pure MoO 3 is in its orthorhombic phase (JCPDF 35-0609) and exhibits several strong diffraction peaks at 2q ¼ 12.8 , 23.4 , 25.7 , 27.3 , 33.8 , 39.0 . 40 In the MoO 3 -g-C 3 N 4 composite, although the content of MoO 3 is very low, MoO 3 phase could still be observed due to its strong XRD signal. As MoO 3 concentration increases from 1.0 wt% to 15 wt%, the diffraction peaks of MoO 3 are gradually intensied, whereas the peaks of g-C 3 N 4 are weakened.…”

Effect of Calcination Temperature on the Structural, Thermodynamic, and Optical Properties of MoO3 Nanoparticles

“…Formation of the nanoparticles was evaluated by recording the FTIR spectrum in the range 400–4000 cm −1 (Figure ). The peaks at 811 and 974 cm −1 are associated with the stretching mode of oxygen linked with metal atom Mo–Mo and Mo=O, respectively . The peak at 1434 cm −1 is associated with the vibrational mode of the Mo–OH bond of adsorbed water.…”

“…The feed rate of Concentrated nitric acid (HNO 3 , Merck) at the rate of 0.1 mL every 15 min was added till 0.8 mL acid was added, and then the mixture was centrifuged and washed using distilled water and methanol (Merck) to eliminate impurities (like NH 3 ). The resulting product was dried in an oven at 80°C for 24 h and further calcined at 250, 350, and 450°C for 01 h and 30 min The reactions are follows: …”

“…Among the many intriguing oxides of nanometer‐sized transition metals, molybdenum oxides are of unique importance because of their characteristic structural and optical properties . Molybdenum oxides have variable oxidation states (from +2 to +6), which make them highly desirable for the synthesis of a variety of smart materials because of their dependence on temperature .…”

INFLUENCE OF ULTRASONIC TREATMENT ON PROPERTIES OF ZnO-MoO3 OXIDE SYSTEM

“…In the spectrum of initial samples (Fig. 2, curve 1 [28,29] and Zn-O bond at 500 cm -1 are observed [30,31]. Due to the samples ultrasonic processing there are some shifts of the absorption bands and the appearance of new bonds vibrations.…”