Removal of malachite green dye from contaminated aqueous solutions using WO3/Eu2O3-visible-light-assisted photocatalysis. Issue 10 (9th August 2021)

• Record Type: Journal Article
• Authors: Abd-Rabboh, Hisham S.M.; Marzouki, Riadh; Alassaf, Abdulaziz; Loghbi, Mohamed; Hamdy, Mohamed S.
• Is Part Of: International journal of environmental analytical chemistry. Volume 101:Issue 10(2021)
• Page Start: 1408
• Page End: 1418
• Publication Date: 2021-08-09
• Subjects: Organic dye removal -- contaminated aqueous solutions -- photocatalysis -- tungsten oxide -- europium oxide-doping; Ecology -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental chemistry -- Periodicals; Pollution -- Periodicals; 577.14
• DOI: 10.1080/03067319.2019.1683551
• Languages: English
• ISSNs: 0306-7319

Abstract

ABSTRACT: Aqueous solutions contaminated with malachite green (MG) organic water-soluble dye were treated with a series of novel europium oxide-doped tungsten oxide photocatalysts (WO3 /Eu2 O3 ) under visible light illumination. First, the photocatalyst series was prepared via a simple preparation procedure. Second, the produced photocatalyst series was investigated using different physical characterisation techniques, including: XRD, FTIR, FESEM, EDX and diffuse reflectance (DR). Characterisation results confirmed the successful and homogeneous doping of europium oxide particles within tungsten oxide. As a result, the photocatalytic activity of the synthesised Eu-doped WO3 samples was assessed at 425 nm. Finally, malachite green contaminated aqueous samples were treated with both un-doped- and doped-tungsten oxide photocatalysts under visible light illumination. Results indicate that doping of tungsten oxide with just 1 mole% europium oxide enhanced the photocatalytic activity of the doped-tungsten oxide, compared with the un-doped photocatalyst, by 4 folds, from 10% to 40%, with a slight decrease in the photocatalysts band-gap energies from 2.76 to 2.65 eV. The first-order rate constants for the photocatalysis of malachite green dye using samples W1-W4 were calculated to be 0.13, 0.61, 0.55, and 0.5, respectively.