The photocatalytic oxidation of azo dyes on Fe2O3 nanoparticles under oxygen pressure

Исаев, А. Б.; Aliev, Z. M.; Adamadzieva, N. K.; Alieva, Nurizhat Alilovna; Magomedova, G. A.

doi:10.1134/s1995078009070088

Cited by 21 publications

(5 citation statements)

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“…Many discussions about the photocatalytic mechanisms of iron‐bearing minerals have been published in many studies . Iron oxide (Fe 3 O 4 and Fe 2 O 3 ) can be hydroxylated in aqueous solutions .…”

Section: Resultsmentioning

confidence: 99%

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Photocatalytic Degradation of Methyl Orange by Fe₂O₃−Fe₃O₄ Nanoparticles and Fe₂O₃−Fe₃O₄−Montmorillonite Nanocomposites

Wang

Liu

et al. 2017

CLEAN Soil Air Water

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Zero‐valent iron nanoparticles (nZVI) are emerging multifunctional agents for contaminant treatment. However, Fe2O3–Fe3O4 nanoparticles (NIO), which are generated when nZVI is oxidized, can also make a meaningful contribution to the photocatalytic degradation of organics. Taking this into account, NIO and a Fe2O3–Fe3O4–montmorillonite nanocomposite (NIO‐M) were prepared, and their morphology and microstructure were investigated via a series of characterization methods. The presence of montmorillonite is critical to decreasing the aggregation and size of the crystals, which helps improve the thermal stability of the crystals. The photocatalysis performance of NIO and NIO‐M for the degradation of methyl orange was evaluated, and the data indicated that NIO‐M exhibited an excellent optical response and photocatalytic activity in the visible region. The degradation rate of methyl orange was 1.47 times faster within 45 min of irradiation compared with NIO. The results indicate that NIO‐M is a promising type of visible‐light‐driven photocatalyst for the degradation of organics in aqueous solutions.

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Section: Resultsmentioning

confidence: 99%

“…The original color of the solution was dark, and the solution gradually became clear during the photocatalysis process. Many discussions about the photocatalytic mechanisms of ironbearing minerals have been published in many studies [49][50][51]. Iron oxide (Fe 3 O 4 and Fe 2 O 3 ) can be hydroxylated in aqueous solutions [2].…”

Section: Photocatalytic Propertiesmentioning

confidence: 99%

Photocatalytic Degradation of Methyl Orange by Fe₂O₃−Fe₃O₄ Nanoparticles and Fe₂O₃−Fe₃O₄−Montmorillonite Nanocomposites

Wang

Liu

et al. 2017

CLEAN Soil Air Water

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“…A dye solution of a certain concentration was poured into a cell described in [14], a 200-ml fl uoroplastic vessel 1…”

Section: Methodsmentioning

confidence: 99%

Photoelectrochemical oxidation of C.I. Direct Black 22 azo dye under elevated oxygen pressure

2012

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Effect of oxygen pressure on the photoelectrochemical oxidation of C.I. Direct Black 22 azo dye on Ti/TiO 2 /RuO 2 and Ti/TiO 2 electrodes was studied. The degree of solution decoloration in its treatment by various methods: electrochemical, photocatalytic, and photoelectrochemical, was estimated.The photoelectrochemical oxidation of azo dyes has been extensively studied [1][2][3][4][5][6][7][8], which is due to prospects for their use in development of power-saving and energy-independent techniques for detoxication of dye-containing wastewater. In [9], data on photoelectrochemical oxidation of Active Blue 17 dye on Ti/Ru 0.3 Ti 0.7 O 2 electrode were reported. It was shown that treatment for 120 min leads to a 95% solution discoloration and 52% decrease in the total organic carbon (TOC).In [10], the role of a photoanode in photoelectrochemical oxidation of Active Blue 4 in a 0.1 M Na 2 SO 4 solution at pH 12 was played by titanium coated with titanium dioxide. A 1-h exposure of a dye solution to UV light leads to full discoloration of the solution and 37% mineralization of dye molecules to give CO 2 and H 2 O. It has been shown that the discoloration effi ciency increases and the TOC decreases in photoelectrochemical oxidation on a Ti/Ru 0.3 Ti 0.7 O 2 electrode for Active Brilliant Orange dye in a 0.05 M NaCl solution [11].The possibility of photoelectrochemical discoloration of Active Orange 16 (AO) textile azo dye in an aqueous solution on a TiO 2 fi lm produced by the sol-gel technique was considered in [12]. The optimal parameters for maximum destruction of AO are pH > 10 and pH < 6 for Na 2 SO 4 and NaCl solutions, respectively. In both cases, a low dye concentration and a +1.0-V electrode potential are recommended for full discoloration of a solution during 20 min of photoelectrolysis. Oxalic acid was identifi ed by high-performance liquid chromatography and UV spectroscopy as the main product formed in dye oxidation.A solution of C.I. Direct Black 22 azo dye (DB) is discolored under photoirradiation and electrochemical and photoelectrochemical treatments as a result of destruction of azo dye molecules both at conjugated bonds and aromatic moieties, with the highest degree of destruction obtained under a photoelectrochemical treatment [13]. However, spectrophotometric data indicate that the aromatic moieties of the molecule are partly preserved in solution.In the present study, we examined, in order to intensify the process, the effect of the oxygen pressure on the photoelectrochemical discoloration of an aqueous solution of DB, which exhibits sensitizing properties and favors excitation of titanium dioxide, under exposure to daylight in a 0.1 M Na 2 SO 4 solution on Ti/TiO 2 /RuO 2 and Ti/TiO 2 electrodes. EXPERIMENTALThe photoelectrochemical oxidation of the DB dye (see structural formula) was performed as follows. A dye solution of a certain concentration was poured into a cell described in [14], a 200-ml fl uoroplastic vessel 1

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“…Along with the surface morphology, oxygen pressure and amount of the catalyst also play a major role in enhancing the photocatalytic properties. Isaev et al [188] reported an enhancement in the photocatalytic activity with an increase in the quantity of Fe 2 O 3 up to a certain point, after that, the photocatalytic activity is decreased. Similarly, the authors reported an enhancement in dye degradation with increased oxygen content.…”

Section: α-Fe 2 Omentioning

confidence: 99%

Advanced Nanomatericals for Solar Photocatalysis

Li¹,

Wang²

2016

Advanced Catalytic Materials - Photocatalysis and Other Current Trends

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Heterogeneous photocatalysis using semiconductors and renewable solar energy has been regarded as one of the most promising processes to alleviate and even solve both the world crises of energy supply and environmental pollution. Recently, numerous semiconducting materials and its composites have been studied for their photocatalytic applications. In this chapter, we briefly summarize recent progress in the binary oxide system (including TiO 2 and α-Fe 2 O 3), ternary oxide (Bi system), and the semiconducting materials and their composites which have remarkable applications in photocatalytic degradation of toxic pollutants, hydrogen production and as an adsorbent for wastewater treatment. In addition, we highlight the challenges and opportunities when we implement photocatalytic materials to help on the development of energy research and find ways to approach major problems.

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The photocatalytic oxidation of azo dyes on Fe2O3 nanoparticles under oxygen pressure

Cited by 21 publications

References 10 publications

Photocatalytic Degradation of Methyl Orange by Fe₂O₃−Fe₃O₄ Nanoparticles and Fe₂O₃−Fe₃O₄−Montmorillonite Nanocomposites

Photocatalytic Degradation of Methyl Orange by Fe₂O₃−Fe₃O₄ Nanoparticles and Fe₂O₃−Fe₃O₄−Montmorillonite Nanocomposites

Photoelectrochemical oxidation of C.I. Direct Black 22 azo dye under elevated oxygen pressure

Advanced Nanomatericals for Solar Photocatalysis

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The photocatalytic oxidation of azo dyes on Fe2O3 nanoparticles under oxygen pressure

Cited by 21 publications

References 10 publications

Photocatalytic Degradation of Methyl Orange by Fe2O3−Fe3O4 Nanoparticles and Fe2O3−Fe3O4−Montmorillonite Nanocomposites

Photocatalytic Degradation of Methyl Orange by Fe2O3−Fe3O4 Nanoparticles and Fe2O3−Fe3O4−Montmorillonite Nanocomposites

Photoelectrochemical oxidation of C.I. Direct Black 22 azo dye under elevated oxygen pressure

Advanced Nanomatericals for Solar Photocatalysis

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Product

Resources

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Photocatalytic Degradation of Methyl Orange by Fe₂O₃−Fe₃O₄ Nanoparticles and Fe₂O₃−Fe₃O₄−Montmorillonite Nanocomposites

Photocatalytic Degradation of Methyl Orange by Fe₂O₃−Fe₃O₄ Nanoparticles and Fe₂O₃−Fe₃O₄−Montmorillonite Nanocomposites