Synthesis and Optimization of Visible Light Active BiVO₄Photocatalysts for the Degradation of RhB

Abstract

Monoclinic BiVO 4 powders were synthesized via a novel route using potassium metavanadate (KVO 3 ) prepared by calcination of K 2 CO 3 and V 2 O 5 as a starting material and followed by hydrothermal treatment and were investigated for the degradation of Rhodamine B (RhB) under visible light irradiation. The synthesized BiVO 4 particles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and UV-Visible (UV-Vis) light diffuse reflectance spectrophotometry. The synthesis produced pure monoclinic BiVO 4 particles with multimorphological features containing flowerlike, flake-ball, flake, cuboid-like, and plate-like shapes and exhibited strong absorption in the visible light range. The BiVO 4 prepared via KVO 3 possessed excellent photocatalytic activity for the degradation of RhB under visible light. The performance of this catalyst was found to be superior to other BiVO 4 photocatalysts prepared via ammonium metavanadate (NH 4 VO 3 ) using coprecipitation, combustion, and calcination methods reported in literature, respectively.

Composite polymer particles containing bismuth vanadate particles for self-cleaning fabrics

“…However, the particle size distribution curve was not very broad, with a PDI of 0.32 (Figure 5(a)). Moreover, regarding the XRD patterns of the prepared BiVO 4 (Figure 5(b)), all of the diffraction peaks agreed with the XRD patterns of standard BiVO 4 (JCPDS Card number 01-083-1699) [50]. The major characteristic peaks observed at both 28.8 � and 28.9 � , respectively, evidenced the monoclinic BiVO 4 structure possessing a good photocatalytic property [51,52].…”

Growth of villi-microstructured bismuth vanadate (Vm-BiVO4) for photocatalytic degradation of crystal violet dye

“…7 As photocatalytic activities are increased by increasing the active surface area, for this purposes various morphologies have been reported such as ower-like, ake-ball and plate-like. 8 Nevertheless, various factors like; photoinduced charge recombination rate, inefficient quantum yield and low visible-light response limit the efficiency of bare BiVO 4 to meet up the practical applications. 9 There are various methods for the synthesis of monoclinic BiVO 4 such as sonochemical method, 10 solid-state reaction, 11,12 sol gel, 13 co-precipitation and electro as well as photo deposition process.…”

“…7 As photocatalytic activities are increased by increasing the active surface area, for this purposes various morphologies have been reported such as flower-like, flake-ball and plate-like. 8 Nevertheless, various factors like; photo-induced charge recombination rate, inefficient quantum yield and low visible-light response limit the efficiency of bare BiVO 4 to meet up the practical applications. 9…”

Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

“…The addition of GO did not alter the crystal phase of the nanoparticles but caused a decrease in the particle size as evident in the broadness of the diffraction peaks. Although low crystallinity has been reported to reduce the photocatalytic activity of particles [35], the reduction in particle size enhances the photocatalytic property of nanomaterials. Furthermore, the incorporation of GO into the photocatalyst is known to increase the surface area and stability of the photocatalyst for wastewater treatment, thus increasing the activity [36].…”