Fabrication of nanospinel ZnCr2O4 using sol–gel method and its application on removal of azo dye from aqueous solution

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

“…Many applications of the nanocrystalline ZnCr 2 O 4 spinel have been reported, e.g., as catalytic material for a variety of reactions [1][2][3], a photocatalyst [4][5][6][7], a sensor for toxic gases [8], and for humidity [9,10].…”

“…A higher temperature of calcination (>1000 • C) is needed for the reactions' completion, which leads to the obtaining of spinel powder with a small surface area [14,15]. 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].…”

“…The most studied research has considered TiO 2 -based materials [26][27][28], and recently, cromite-type materials have raised a high interest due to their certain peculiarities for photocatalysis applications, e.g., small band-gap energy and chemical stability [29,30]. ZnCr 2 O 4 is considered a very important spinel compound, due to its potential application as an efficient catalyst, and its photocatalytic activity has been reported for the removal of organic dyes from wastewaters [6,31].…”

Novel dendrite-like CuCr2O4 photocatalyst prepared by a simple route in order to remove of Azo Dye in textile and dyeing wastewater

“…Various materials such as oxides of transition metal and non-transition metal ions, spinels (CuAl 2 O 4 , ZnCr 2 O 4 ), perovskites (BaTiO 3 , SrTiO 3 ), scheelite-based compounds (BiVO 4 , LaVO 4 ) and mesoporous titanium dioxide have been explored as efficient photocatalysts [11][12][13][14][15][16][17][18][19][20]. Most of these oxides and semiconductors have a wide band gap which is only absorb ultraviolet irradiation and lacks visible light absorption [21].…”

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

“…The nanoparticles ZnCr 2 O 4 have been synthesized by various methods including sol-gel method 9 , mechanical activation 10 , micro-emulsion method 11 , precursor method 12 , microwave processing 13 , and spray pyrolysis 14 . Among the main techniques for generating nanoparticles via the wet chemical route, solution combustion is the one that stands out.…”