Photocatalytic reduction of Cr(VI) on the new hetero-system CuCr2O4/ZnO

Lahmar, H.; Kebir, Mohammed; Nasrallah, Noureddine; Trari, M.

doi:10.1016/j.molcata.2011.10.026

Cited by 63 publications

(19 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Spinel copper chromate (CuCr 2 O 4 ) with a narrow band gap (1.4 eV) has been widely used in H 2 production, solar absorbing pigments, oxidation and decomposition of volatile organic compounds, and also drawn considerable attention in the organic dye degradation due to their excellent properties such as good chemical stability, low cost, easy preparation, and environmental advantages (zero corrosion rate) [19,20]. Accordingly, CuOCuCr 2 O 4 nanocomposites were prepared by reflux condensation method for different Cr 3+ concentration, and their photocatalytic activity was investigated using methyl orange (MO) and methylene blue (MB) dyes as model pollutants under UV light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Novel CuCr2O4 embedded CuO nanocomposites for efficient photodegradation of organic dyes

Mageshwari

Ramakrishnan²,

Lee

et al. 2015

Applied Surface Science

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Novel CuCr2O4 embedded CuO nanocomposites for efficient photodegradation of organic dyes

Mageshwari

Ramakrishnan²,

Lee

et al. 2015

Applied Surface Science

View full text Add to dashboard Cite

“…The oxygen over-voltage is high on the stannates; the level O 2/ H 2 O is located far above the valence band and oxygen does not evolve on Ba 2 SnO 4 . So, the reduction is achieved in presence of oxalic acid as hole scavenger which promotes the charges separation and protects the oxide against photo corrosion (Lahmar et al 2012;Iliev et al 2010). …”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of nano structured Ba2SnO4 as a novel photocatalyst material for the chromate reduction

et al. 2013

Self Cite

View full text Add to dashboard Cite

The photo-electrochemical properties of the layered perovskite Ba 2 SnO 4 , prepared by nitrate route are reported for the first time. The oxide exhibits a direct optical transition at 2.98 eV, attributed to the charge transfer O 2-: 2p ? Sn 4? : 5s and possesses a chemical stability over the whole pH range. The Mott Schottky plot in acidic medium is characteristic of n type conductivity with a flat band potential E fb of -0.84 V SCE and an electron density N D of 1.14 9 10 17 cm -3 . The electrochemical impedance spectroscopy reveals the bulk and grain boundaries contributions. Ba 2 SnO 4 is of interest for the environmental protection. At pH 2.5, its conduction band (CB, -0.86 V SCE ) is below the HCrO 4 -level, yielding a spontaneous reduction to Cr 3? under UV light. The reduction is optimized with respect to the Cr(VI) concentration. The photo reduction follows a pseudo-first-order kinetic and the data fit well the Langmuir-Hinshelwood (L-H) model with an apparent rate constant of 0.18 h -1 for an initial concentration of 50 ppm. The chromate reduction under solar light is studied under optimized conditions. In presence of oxalic acid, 73 % of initial concentration disappears after *2 h of irradiation.

show abstract

“…8b). The obtained Eg value of the as-prepared CuCr 2 O 4 nanoparticles estimated to be 3.35 eV, that has a blue shift compared with the band gap amount of prepared copper chromite in previous literatures [30] which this occurred blue shift is attributed to reduce in the particle size which this particle size reduction brings about variation in particle energy surfaces and enhance the band gap amount. Moreover, the obtained Eg value for as-prepared copper chromite sample The influence of morphology on photocatalytic activity was investigated by monitoring the degradation of eosin Y as water pollutant in an aqueous solution over as-prepared sample nos.…”

Section: Resultsmentioning

confidence: 70%

Preparation and characterization of the CuCr2O4 nanostructures via a new simple route

Beshkar

Zinatloo-Ajabshir

Salavati‐Niasari

2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Pure copper chromite (CuCr 2 O 4 ) nanostructures were prepared via a new simple route. Nanostructures were synthesized by heat treatment in air at 900°C for 5 h, using powder, which was obtained by a solvent-free solidstate reaction (using ball milling) from 1:2 molar ratio of [Cu(en) 2 (H 2 O) 2 ]Cl 2 and [Cr(en) 3 ]Cl 3 Á3H 2 O as novel precursors. The effect of ball milling duration and calcination temperature on the morphology and size of copper chromite was investigated. It was found that these parameters have significant influence on the morphology and size of the CuCr 2 O 4 . The as-synthesized CuCr 2 O 4 nanostructures were characterized by means of several techniques such as X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray microanalysis, transmission electron microscopy and UVVis diffuse reflectance spectroscopy. Furthermore, the photocatalytic degradation of anionic dyes such as eosin Y, erythrosine and phenol red as water pollutants was performed to study the catalytic properties of as-prepared nanostructures.

show abstract

Photocatalytic reduction of Cr(VI) on the new hetero-system CuCr2O4/ZnO

Cited by 63 publications

References 16 publications

Novel CuCr2O4 embedded CuO nanocomposites for efficient photodegradation of organic dyes

Novel CuCr2O4 embedded CuO nanocomposites for efficient photodegradation of organic dyes

Preparation and characterization of nano structured Ba2SnO4 as a novel photocatalyst material for the chromate reduction

Preparation and characterization of the CuCr2O4 nanostructures via a new simple route

Contact Info

Product

Resources

About