%D 2021
%R 10.1080/00986445.2019.1674823
%N 4
%O cited By 5
%L scholars16040
%J Chemical Engineering Communications
%X Sigle phase scheelite-monoclinic BiVO4 materials with different morphologies were successfully fabricated via a facile hydrothermal process by controlling pH of the precursor. The photocatalytic properties of the as-prepared materials were assessed via the photodecomposition of crystal violet (CV) solution under a 60 W LED (Cree-L6) visible light irradiation. The Langmuir-Hinshelwood model was utilized to present kinetic behavior. The obtained BiVO4 exhibited a monoclinic crystalline structure and narrow bandgap energy (Eg = 2.3�2.6 eV), which were confirmed by the X-ray diffraction (XRD), Raman and UV-vis diffuse reflectance spectra (UV-vis DRS) results. From the scanning electron microscopy (SEM) results, BiVO4 morphologies could be facilely controlled by turning the pH value of the precursor. When pH = 0.3, the BiVO4 products showed spherical morphologies with particle sizes in the range of 1�5 µm. Rod- and spherical like-BiVO4 products were obtained when the pH of the precursor was adjusted to 3. Moreover, BiVO4 with nanoparticles could be prepared under the pH of 5�7, whereas leaf-like morphologies could be achieved when pH = 9. The photocatalytic test showed that the adsorption equilibrium constant depended on the morphologies of the BiVO4 products and the reaction rate constant was reached the highest level at pH = 3. This outcome indicated that the enhanced performance of BiVO4 significantly depended on the morphologies of the BiVO4 products and the effective suppression of photo-excited electrons and holes. © 2019 Taylor & Francis Group, LLC.
%K Chromium compounds; Crystals; Equilibrium constants; Image enhancement; Irradiation; Light; Nanocrystalline materials; Photocatalysts; Photocatalytic activity; Photodegradation; Rate constants; Scanning electron microscopy; Tungstate minerals, Adsorption equilibrium constants; BiVO4; Crystal violet; Hydrothermal methods; Langmuir-Hinshelwood models; UV-vis diffuse reflectance spectra; Visible light; Visible-light irradiation, Bismuth compounds
%P 530-538
%T Crystal violet degradation over BiVO4 photocatalyst under visible light irradiation
%I Taylor and Francis Ltd.
%A L.X. Nong
%A V.H. Nguyen
%A L.G. Bach
%A T.V. Tran
%A S.S. Hong
%A B. Abdullah
%A N.K. Hien
%A T.D. Nguyen
%V 208