One-step hydrothermal synthesis of Sb2WO6 nanoparticle towards excellent LED light driven photocatalytic dye degradation

Abstract

Pristine Antimony tungstate nanoparticles prepared via a simple hydrothermal process showcase interesting photocatalytic efficiency, degrading Methylene Blue (MB) completely in 180 min under visible light. In this study, the impact on crystalline quality and related optical properties as well as photocatalytic efficiency of antimony tungstate due to temperature variation during hydrothermal synthesis are explored. While X-ray diffraction (XRD) shows the polycrystalline nature of all synthesized samples, however a systematic increase in crystallite size is revealed by analysing the XRD peak broadening. XRD spectra are further examined by Rietveld analysis showing a change in unit cell volume. Additionally, the overall changes in the corresponding grain size and micro-strain developed in the crystals are determined using the Williamson-Hall plot. Moreover, significant variations in few Raman modes are observed with increasing synthesis temperature. A notable modification in the optical band gap as determined from the absorbance of the UV-Vis spectra is perceived with the change in synthesis temperature within the range of ~2.38-2.57 eV. Further, the photoluminescence measurement indicates that the synthesized antimony tungstate is weak 2 luminescent material with a band-to-band emission at ~468 nm. Finally, photocatalytic efficiencies of the samples are ascertained to change with the synthesis parameter, estimated by decomposing methylene blue (MB), highest degradation rate constant (k) value is observed as 0.015 min -1 for the sample prepared at 180 o C. While the sample with the highest efficiency is also applied for degrading the Rhodamine B (RhB) and Potassium Dichromate (K2Cr2O7) under visible light irradiation.

Rapid adsorption and simultaneous photocatalytic effect of Ru doped flower like antimony tungstate

“…SWO is a low emissive material. It has a prominent peak near 468 nm corresponding to the band to band transition [13]. A small but distinct diminishing tendency in the emission intensity is observed from figure 9(b) with Ru doping.…”

“…into water bodies without an effective careful water treatment [7]. As a consequence, several methods are used for water treatment including adsorption [8], ozonation [9], membrane filtration [10], bioadsorption [11], photocatalytic degradation [12][13][14], coagulation [15], etc. However, photocatalysis is the most effective from the perspective of permanently destroying the dye by converting the toxic organic molecules into the corresponding innocuous inorganic components via an advanced oxidation process [12,[16][17][18].…”

Design and development of a Sb2WO6/graphene oxide (2D) nanocomposite as novel electrochemical metal-ion sensor and improved photocatalyst for the degradation of tetracycline

“…The diffraction peaks of Sb 2 WO 6 were observed to match with its JCPDS card no. 47.1680, corresponding to the orthorhombic phase 34 with 2 θ values at 20.400°, 27.411°, 29.419°, 33.034°, 36.760°, 47.7°, 50.1°, 53.5°, and 55.7° for the designated diffraction ( hkl ) planes. The diffraction peaks observed for pure Sb 2 WO 6 were broad, indicating an attenuated particle size.…”

Identifying Stable Electrocatalysts Initialized by Data Mining: Sb2WO6 for Oxygen Reduction

“…All calculations were performed using DFT implemented in the Vienna Ab initio Simulation Package (VASP). [ 55 , 56 ] The generalized gradient approximation method with the revised Perdew–Burke–Ernzerhof (RPBE) functionals [ 57 , 58 ] and projector augmented wave (PAW) [ 59 ] method were employed. The energy cutoff and force convergence criteria were set to 400 eV and 0.05 eV Å −1 , respectively.…”