Fenton Degradation of Organic Compounds Promoted by Dyes under Visible Irradiation

Key Laboratory of Photochemistry, Center for Molecular Science, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080, China.
Environmental Science and Technology (Impact Factor: 5.33). 08/2005; 39(15):5810-5. DOI: 10.1021/es050001x
Source: PubMed


The influence of dyes on the Fenton reaction of organic compounds under visible irradiation (lambda > 450 nm) was examined. It was found that the presence of dyes could accelerate greatly the Fenton reaction of organic compounds such as salicylic acid, sodium benzenesulfonate, benzyltrimethylammonium chloride, and trichloroacetic acid under visible irradiation and that a complete mineralization of those compounds could also be achieved. The dyes such as Alizarin Violet 3B which has an anthraquinone structure unit showed much more significant effect on the reaction than the dyes such as malachite green without the quinone unit. A reaction mechanism of dye AV as a cocatalyst in the photo-Fenton reaction of organic compounds under visible irradiation is proposed based on the cycle of Fe(3+)/Fe(2+) catalyzed by quinone species and an electron transfer from the excited dye molecule to Fe3+.

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Available from: Chuncheng Chen
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    • "The US Food and Drug Administration (FDA) has considered this dye as a priority chemical for carcinogenicity testing[43,44]. The destruction of Malachite Green with fast decolorization by TiO 2 photocatalysis[44], Fenton[45], photo-Fenton[45,46], zero-valent iron[47]and several EAOPs[11,18,19,48]has been described. Guenfoud et al.[11]degraded 1 dm 3 of 20 mg dm À3 MGox by AO in a Diacell 500 flow plant equipped with a BDD/stainless steel (SS) cell and found 91% chemical oxygen demand (COD) reduction after 180 min in the presence of 0.1 mol dm À3 Na 2 SO 4 , at pH 3 and 32 mA cm À2 . "
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    ABSTRACT: The degradation of 100 cm3 of 177 mg dm-3 of the triphenylmethane dye Malachite Green oxalate at pH 3.0 was studied by anodic oxidation with stainless steel cathode (AO-SS), AO with air-diffusion cathode (AO-H2O2), electro-Fenton (EF) and photoelectro-Fenton (PEF) with UVA light. The main oxidizing species were hydroxyl radicals formed from either water oxidation at the anode surface or in the bulk between added Fe2+ and H2O2 generated at the air-diffusion cathode. The use of a Pt anode led to slower decolorization and mineralization than BDD in all treatments because of the higher oxidation power of the latter. The decolorization was much faster for EF and PEF compared to AO-SS and AO-H2O2 due to the contribution of hydroxyl radicals in the bulk. PEF allowed the quickest color removal by the rapid Fe2+ regeneration from the photolysis of Fe(III) complexes with oxalate. The most powerful process was PEF with BDD, which yielded total decolorization in 6 min and 97% mineralization at 240 min operating at 100 mA cm-2, thanks to hydroxyl radicals formed at the anode surface and in the bulk along with the photolytic action of UVA radiation. The evolution of final carboxylic acids like maleic, fumaric, succinic, acetic, oxalic, formic and oxamic was followed by ion-exclusion HPLC. All these acids and their Fe(III) complexes were removed more slowly with Pt anode. The initial N atoms of the dye were pre-eminently accumulated as NH4+ ion, along with small amounts of NO3- ion.
    Full-text · Article · Nov 2015 · Electrochimica Acta
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    • "Classic Fenton reaction (Fe 2+ /H 2 O 2 ) is one of the most widely used AOPs for the degradation of a wide range of refractory organics such as dyes that cannot be oxidation biologically in effluents (Fan et al., 2010; Ma et al., 2005). In Fenton process the generation of hydroxyl radical is based on the electron transfer between hydrogen peroxide (H 2 O 2 ) and a metal catalyst such as (Fe 2+ ) (Ali et al., 1996). "

    Full-text · Article · Jul 2015 · Research Journal of Environmental Sciences
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    • "During the last two decades, the catalytic effects of different redox mediators on the degradation processes of pollutants have been studied, which include anthraquinone dyes, humic acid (HA), fulvic acid (FA) and some aromatic compounds. Ma et al. [13] demonstrated that the presence of dyes could accelerate greatly the Fenton reaction of organic compounds. The dyes such as Alizarin Violet 3B which has an anthraquinone structure unit showed much more significant effect than the dyes such as malachite green without the quinone unit. "
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    ABSTRACT: Polyhydroquinone, an immobilized quinone, was synthesized by oxidative polymerization of hydroquinone. The polymers obtained were characterized by Fourier-transform infrared spectra and cyclic voltammetry. Polyhydroquinone is a redox-active polymer with quinone/hydroquinone redox active units in the main chain. The influence of polyhydroquinone in the Fe3O4/persulfate system was examined. It was found that the addition of polyhydroquinone in Fe3O4/persulfate system increased the oxidation rate of Rhodamine B (RhB), which was ascribed to their role as an electron shuttle. The presence of polyhydroquinone successfully builds up two cycles, one semiquinone/quinone cycle, another cycle of Fe(III)/Fe(II) induced by quinone. The presence of phenolic and quinonoid moieties in the structure of polyhydroquinone provide for their ability to reduce Fe(III), thereby assisting the redox cycling of Fe and increasing degradation of the target substrate.
    Full-text · Article · Mar 2014 · The Chemical Engineering Journal
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