Precursor method—A nonconventional route for the synthesis of ZnCr2O4 spinel

Synthesis, Characterization of Nanosized ZnCr2O4 and Its Photocatalytic Performance in the Degradation of Humic Acid from Drinking Water

“…The diffraction peaks of ZnCr 2 O 4 become sharper as the calcination temperature increases (Figure 3). This evolution is very similar to that reported by Gingasu et al for their zinc chromite powders, synthesized by using the precursor method via thermal decomposition of tartarte/gluconate compounds [24].…”

“…The diffraction peaks of ZnCr2O4 become sharper as the calcination temperature increases (Figure 3). This evolution is very similar to that reported by Gingasu et al for their zinc chromite powders, synthesized by using the precursor method via thermal decomposition of tartarte/gluconate compounds [24]. From the structural point of view, an obvious increase of lattice parameter a and unit cell volume V takes place with the increase of the thermal treatment temperature from 450 to 600 °C, when the crystallization process is still in progress.…”

“…Various synthesis methods, such as co-precipitation [16,17], sol-gel [6,18], thermolysis of polymer-metal complex [19], microwave [14,20], and hydrothermal methods [15,21,22] have been investigated in order to obtain spinel powders with higher specific surface areas. Among all these methods, the most efficient one, which considers the lack of stoichiometry control and allows the formation of homogeneous nanoparticles with very good properties for catalytic and photocatalytic usage, is considered to be synthesis at a low temperature, starting from different precursors [23][24][25].…”

Effect of the Fuels Glycine, Urea and Citric Acid on Synthesis of the Ceramic Pigment ZnCr2O4 by Solution Combustion

“…Figure 4 shows the diffuse reflectance factor spectrums in the range of 400-700 nm of the powders ZnCr 2 O 4 synthesized by solution combustion which were annealing at 700 °C and 2h. The minima reflectance peaks between 420-430 nm and 22,23 . The most important effect of the fuel in the synthesis of ZnCr 2 O 4 can be appreciated in the diffuse reflectance percentages, when the glycine is used, the reflectance percentages in the visible spectrum are higher than urea and citric acid, for example with wavelength of 550 nm, the reflectance percentages are: 50% (glycine), 42,5% (urea), and 25% (citric acid), these results are a consequence of the presence of volumetric defects, because at the microscopic level the loss due to bulk scattering is a result of the interaction of the electromagnetic wave with the microstructure of the sample.…”

In situ synthesis of Al2O3‐supported ZnCr2O4 nanoparticles for application as an activated photocatalyst

“…Since the photocatalytic and catalytic behaviors of the synthesized ZnCr 2 O 4 are important factors determining its applications, the researchers focus on the special methods enhancing these properties by decreasing the particle size and/or increasing the a s. [19][20][21] It is very important to choose the best preparation method and materials to obtain a pure and highly active product with high a s . 22 Mousavi et al have been recently reported a facile co-precipitation method to achieve ZnCr 2 O 4 NPs from Zn(NO 3 ) 2 Á6H 2 O and CrCl 3 Á6H 2 O. 12 Gingasu et al have been synthesized ZnCr 2 O 4 NPs using precursor method via thermal decomposition of tartarate compound and gluconate compound.…”