Brilliant Yellow, Transparent Pure, and SiO₂-Coated BiVO₄ Nanoparticles Made in Flames

Abstract

Transparent, yellow bismuth vanadate nanoparticles were made by flame spray pyrolysis. These materials are of special interest as brilliant yellow pigments. The structural properties of the as-prepared powders were characterized by X-ray diffraction, Raman spectroscopy, nitrogen adsorption, transmission electron microscopy, zeta potential measurements, and photospectroscopy. Depending on the particle collection temperature, either pale, amorphous materials or brilliant yellow-green, crystalline BiVO4 with particle size of about 50 nm were formed by direct calcination above 300 °C. The addition of Si during flame synthesis of BiVO4 resulted in smaller such crystals of about 20 nm that were embedded in silica. This prevented sintering of the BiVO4 particles during calcination at 400 °C and resulted in thermally stable, highly transparent, yellow particles.

CTAB-assisted synthesis of monoclinic BiVO4 photocatalyst and its highly efficient degradation of organic dye under visible-light irradiation

“…Among the three crystalline phases of BiVO 4 , tetragonal zircon (z-t), tetragonal scheelite (s-t) and monoclinic scheelite (s-m) structures [12], it is found that the monoclinic scheelite BiVO 4 (m-BiVO 4 ) exhibits much higher photocatalytic activity than the other two tetragonal phases [13,14]. Therefore, many methods have been employed for the synthesis of m-BiVO 4 , such as solid-state reaction [15,16], hydrothermal or solvothermal method [17][18][19][20][21], aqueous method [22][23][24], ultrasound-or microwave-assisted route [25,26], metalorganic decomposition [27,28], flame spray pyrolysis [29], and solution combustion method [30]. Compared with other methods, aqueous method provides a milder environment for the synthesis of monoclinic BiVO 4 and the reaction parameters as well as the properties of the products could be easily tuned.…”

Nanosized BiVO4 with high visible-light-induced photocatalytic activity: Ultrasonic-assisted synthesis and protective effect of surfactant

“…Various methods have been used to synthesize BiVO 4 crystallites, such as aqueous process [10,[19][20][21][22], hydrothermal process [23][24][25], organic decomposition method [26], chemical bath deposition [27], solution combustion synthesis method [28], flame spray pyrolysis [29], and solid-state reaction (SSR) method [30]. Recently, our group has reported a sonochemical route to synthesize BiVO 4 photocatalyst with relative high photocatalytic activity [31].…”

Review of Bi2O3 based glasses for electronics and related applications

“…499,513 Bismuth vanadate (BiVO 4 ) is a relatively new yellow pigment that provides an alternative to toxic Pb and Cd based pigments, 514 and crystalline bismuth borates have interesting optical properties, 351 akin to the corresponding glasses (see the section on 'Optics'). A quite extensive list of Bi 2 O 3 based compounds and corresponding applications is given in recent work, 403,515 together with an extensive discussion on their structural features (some of which are also discussed in the section on 'Coordination of bismuth in crystalline oxides' in Supplementary Material 1 http://dx.doi.org/10.1179/ 1743280412Y.0000000010.S1, as they yield insight into the structure of the corresponding glasses).…”