Heterogeneous photo-Fenton process for degradation of azo dye: Methyl orange using a local cheap material as a photocatalyst under solar light irradiation

Khennaoui, Badis; Malouki, Moulay Abderrahmane; Canle, Moisés; Zehani, Fouzia; Boutaoui, N.; Salah, Zakaria Redouane; Zertal, Abdennour

doi:10.1016/j.ijleo.2017.02.081

Cited by 24 publications

(1 citation statement)

References 25 publications

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“…If mild oxidationc onditions are used, most of these methods requirec o-catalysts such as N-hydroxyphthalimide [14] and 2,2,6,6-tetramethylpiperidine-1-oxyl, [15] which may constitute seriouseconomic impediments for largescale applications. Photocatalytic oxidation has received enormousa ttention duringr ecent years because of its potential applications in environmental treatment [16][17] and the synthesis of fine chemicals. [18,19] Some important advances have been achieved in the UV or visible-light-triggered catalytic oxygenation of cyclohexane or other organic compoundsb yO 2 and the use of efficient photocatalysts including semiconductor oxides, [20][21][22][23][24][25] NaY zeolite, [26][27][28] transition metal complexes, [29][30][31] iron(III)c hloride, [32][33][34] copper(II) chloride, [35,36] decatungstate, [37][38][39][40][41][42][43] and so on.…”

Section: Introductionmentioning

confidence: 99%

Vanadium‐Substituted Tungstophosphoric Acids as Efficient Catalysts for Visible‐Light‐Driven Oxygenation of Cyclohexane by Dioxygen

Tang

et al. 2015

ChemCatChem

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This paper discloses that the oxygenation of cyclohexane by dioxygen (O2) to cyclohexanol and cyclohexanone over three vanadium‐substituted tungstophosphoric acids (PW11V1, PW10V2, PW9V3) can occur in MeCN under visible‐light irradiation, but provides very low cyclohexane conversion (0.8–2.4 %) with modest cyclohexanone selectivity (51–58.3 %). Importantly, an HCl aqueous solution was found to drastically promote this photooxygenation catalyzed by PW10V2 and especially PW9V3 acids, respectively providing approximately 20.4 and 23.4 % cyclohexane conversion and approximately 82.5 and 87.1 % cyclohexanone selectivity, with a concomitant formation of a small amount of chlorocyclohexane. However, such promoting effect was negligible in the PW11V1‐ photocatalyzed oxygenation and the other acids and the chlorine‐containing salts did not show any promotion effect on the present photocatalysis reaction. Notably, the HCl‐promoted photocatalytic oxygenation was significantly influenced by the amount of water. The cyclohexanone selectivity continuously and significantly increased with water amount, but photooxygenation efficiency drastically decreased if a slight excess amount of water was added. Based on these findings and the UV/Vis spectral and cyclic voltammetric measurements, a free‐radical mechanism initiated by the Cl atoms generated in the present photocatalysis system was proposed.

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Section: Introductionmentioning

confidence: 99%

Vanadium‐Substituted Tungstophosphoric Acids as Efficient Catalysts for Visible‐Light‐Driven Oxygenation of Cyclohexane by Dioxygen

Tang

et al. 2015

ChemCatChem

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Visible‐Light‐Enhanced Photocatalytic Activity of Totally Inorganic Halide‐Based Perovskite

et al. 2018

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The removal of contaminants is an interesting topic in environmental research and for society nowadays. In this sense, perovskite materials have proven to be amazing photocatalysts. In this study, CsSnBr3 perovskite was synthesized and characterized using techniques such as x‐ray diffraction, Raman spectroscopy, x‐ray photoelectron spectroscopy and UV‐vis spectroscopy. A mixture of cubic and tetragonal crystalline phases was found in the sample, and XPS revealed the presence of two oxidation states for Sn, and the formation of surface non‐stoichiometric tin oxide. A good light harvesting in the visible range of the electromagnetic spectrum was also found for the perovskite synthesized, which is also insoluble in water. Furthermore, adsorption and photocatalytic tests were performed. Degradation of crystal violet dye was found after the adsorption tests, but the adsorption rate affected the photocatalytic process. Therefore, CsSnBr3 shows a good photocatalytic activity for degrading dyes and contaminants.

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Combination of adsorption and heterogeneous photo-Fenton processes for the treatment of winery wastewater

Guimarães

Lucas

Peres

2019

Environ Sci Pollut Res

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Heterogeneous photo-Fenton process for degradation of azo dye: Methyl orange using a local cheap material as a photocatalyst under solar light irradiation

Cited by 24 publications

References 25 publications

Vanadium‐Substituted Tungstophosphoric Acids as Efficient Catalysts for Visible‐Light‐Driven Oxygenation of Cyclohexane by Dioxygen

Vanadium‐Substituted Tungstophosphoric Acids as Efficient Catalysts for Visible‐Light‐Driven Oxygenation of Cyclohexane by Dioxygen

Visible‐Light‐Enhanced Photocatalytic Activity of Totally Inorganic Halide‐Based Perovskite

Combination of adsorption and heterogeneous photo-Fenton processes for the treatment of winery wastewater

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