Photochemistry of hydrolytic iron (III) species and photoinduced degradation of organic compounds. A minireview

Wu, Feng; Deng, Nansheng

doi:10.1016/s0045-6535(00)00024-2

Cited by 355 publications

(168 citation statements)

References 64 publications

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“…At high pH, Fe 3þ tends to precipitate and the predominant species, FeðOHÞ þ 2 , is considerably less photoactive. The pH decrease in Milli-Q water could increase the Fe(OH) 2þ complex concentration leading to a higher bacterial rate of inactivation (Pignatello et al, 2006;Hug and Leupin, 2003;Feng and Nansheng, 2000).…”

Section: E Coli Inactivation In Leman Lake Watermentioning

confidence: 99%

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Comparative effect of simulated solar light, UV, UV/H2O2 and photo-Fenton treatment (UV–Vis/H2O2/Fe2+,3+) in the Escherichia coli inactivation in artificial seawater

et al. 2013

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Fe 2þ and 10 mg L À1 of H 2 O 2 , led to the fastest bacterial inactivation kinetics. Using H 2 O 2 / UV 254 high disinfection rates were obtained similar to those obtained with photo-Fenton under UV 254 light. In Milli-Q water, the rate of inactivation for Escherichia coli was higher than in Leman Lake water and seawater due to the lack of inorganic ions affecting negatively bacteria inactivation. The presence of bicarbonate showed scavenging of the OH radicals generated in the treatment of photo-Fenton and H 2 O 2 /UV 254 . Despite the negative effect of inorganic ions, especially HCO 3 -, the disinfection treatments with AOPs in lake water and seawater improved significantly the disinfection compared to light alone (simulated sunlight and UV 254 ). In the treatment of photo-Fenton with simulated sunlight, dissolved organic matter had a beneficial effect by increasing the rate of inactivation. This is associated with the formation of Fe 3þ -organo photosensitive complexes leading to the formation of ROS able to inactivate bacteria. This effect was not observed in the photo-

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Section: E Coli Inactivation In Leman Lake Watermentioning

confidence: 99%

“…Some of these complexes with iron species in high oxidation state may be involved in the formation of radicals within the photo-Fenton system (Pignatello et al, 2006;Hug and Leupin, 2003;Feng and Nansheng, 2000).…”

Section: Introductionmentioning

confidence: 99%

Comparative effect of simulated solar light, UV, UV/H2O2 and photo-Fenton treatment (UV–Vis/H2O2/Fe2+,3+) in the Escherichia coli inactivation in artificial seawater

et al. 2013

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“…Part of the H 2 O 2 is already formed in the dark before the experiment begins, but its formation is enhanced under illumination. The production of hydrogen peroxide reveals that the Haber-Weiss mechanism occurs (Santana-Casiano et al 2005) (reactions 1-6), with the consequent production of hydroxyl radicals able to promote the phenol disappearance according to reaction 8 (Buxton et al 1988 (Joseph et al 2001, Baxendale et al, 1955 and the ·OH radical formation can be realized accordingly to the reaction 11 (Feng and Nansheng, 2000):…”

Section: Fe(ii)/fe(iii)mentioning

confidence: 99%

“…Particulate Fe(III) oxyhydroxides are formed by oxidation of Fe(II) at the oxic/anoxic boundary in coastal marine waters (Yao andMillero, 1995, Kuma et al 1998). Possible semiconduction properties of many Fe(III) oxides, oxy-hydroxydes and hydroxides have drawn attention for their role in the natural abiotic transformation of the organic matter (Feng and Nansheng, 2000;Leland and Bard, 1987). In the surficial layer iron oxides could be in the form of goethite (α-FeOOH ), hematite (α-Fe 2 O 3 ) and akaganeite (β-FeOOH).…”

Section: Introductionmentioning

confidence: 99%

Role of iron species in the photo-transformation of phenol in artificial and natural seawater

Calza

Massolino

Pelizzetti

et al. 2012

Science of The Total Environment

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The role played by iron oxides (goethite and akaganeite) and iron(II)/(III) species as photosensitizers toward the transformation of organic matter was examined in saline water using phenol as a model molecule. The study was carried out in NaCl 0.7 M solution at pH 8, artificial (ASW) and natural (NSW) seawater, in a device simulating solar light spectrum and intensity. Under When NSW is spiked with phenol and iron oxides, Fe(II) or Fe(III), halophenols production is enhanced. A close analogy exists between Fe(III), Fe(II)/goethite in ASW and NSW products. Different halophenols production in the natural seawater samples depends on Fe(II)/goethite (above all for 3-chlorophenol, 2,3-dichlorophenol and 4-bromophenol formation) and on Fe(III) colloidal species (3-chlorophenol).3

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“…Nas condições em que o processo é aplicado (solução aquosa e pH 3), os íons férricos (Fe 3+ ) encontram-se predominantemente na forma Fe(OH) 2+ 30 , espécie que absorve notavelmente radiação de comprimento de onda maior que 300 nm 32 . A absorção de radiação leva à fotorredução dos íons férricos, com formação de íons ferrosos e geração de mais um equivalente de radical hidroxila (Equação 3).…”

Section: Degradação Fotoquímica De Btxsunclassified

Degradação de BTXs via processos oxidativos avançados

Tiburtius¹,

Peralta‐Zamora²,

Emmel³

et al. 2005

Quím. Nova

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Recebido em 26/2/04; aceito em 30/7/04; publicado na web em 12/11/04 DEGRADATION OF BTXs BY ADVANCED OXIDATIVE PROCESSES. In this study the efficiency of advanced oxidative processes (AOPs) were investigated toward the degradation of aqueous solutions containing benzene, toluene and xylenes (BTX). The results indicated that BTX can be effectively oxidized by the UV-A-assisted photo-Fenton process. The treatment permits almost total degradation of BTX and removal of more than 80% of the phenolyc intermediates at reaction times of about 30 min. Preliminary investigations using solar light suggest a good potentiality of the process for the treatment of large volumes of aqueous samples containing these polluting species.Keywords: BTXs; advanced oxidation processes; remediation. INTRODUÇÃOA contaminação de solos e águas subterrâneas por compostos orgânicos voláteis tem sido destaque nas últimas décadas, principalmente em função da freqüência com que episódios de contaminação são verificados e da gravidade com que o meio ambiente é afetado. Embora os grandes vazamentos acidentais de petróleo sejam preocupantes e ocupem grande espaço na mídia, estima-se que a principal fonte de contaminação por estas espécies seja devida a pequenos e contínuos vazamentos de combustível em postos de distribuição 1 , favorecidos pelo envelhecimento dos taques de estocagem.No Brasil existem cerca de 27.000 postos de combustíveis, muitos dos quais operando em condições de risco. Em razão deste fato, o potencial poluente desta atividade mostra-se bastante elevado, o que faz com que a contaminação de aqüíferos seja apenas uma questão de tempo 2 . A preocupação relacionada com o potencial de contaminação de águas subterrâneas vem crescendo em diversas cidades, principalmente São Paulo, Curitiba e Joinville. Estudos realizados pela prefeitura de Joinville em 65 postos da cidade revelaram que somente um dos postos examinados não apresentava problemas de vazamento que redundasse em contaminação do lençol freático 3 .O potencial poluente da gasolina está diretamente relacionado com os hidrocarbonetos aromáticos de maior solubilidade em água, isto é, benzeno, tolueno e xilenos (BTXs). Dentre estes, o benzeno mostrase especialmente tóxico, podendo provocar câncer quando em condições de exposição crônica, principalmente devido à absorção por via respiratória 4 . Além disso, a gasolina comercializada em nosso país é aditivada com cerca de 20 a 25% de etanol, fator que aumenta consideravelmente a solubilidade destes poluentes e, conseqüentemente, a sua migração em corpos d'água 5 . Adicionalmente, estudos recentes têm demonstrado que a biodegradação do etanol consome rapidamente todos os aceptores de elétrons disponíveis no meio, o que faz com que a biodegradação dos BTXs seja drasticamente afetada 6 . Em função destes antecedentes, a busca de novas alternativas para a remediação de águas contaminadas mostra-se absolutamente essencial.Nos últimos anos, os processos oxidativos avançados (POAs) têm aparecido como uma excelente alternativa para o tratame...

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Photochemistry of hydrolytic iron (III) species and photoinduced degradation of organic compounds. A minireview

Cited by 355 publications

References 64 publications

Comparative effect of simulated solar light, UV, UV/H2O2 and photo-Fenton treatment (UV–Vis/H2O2/Fe2+,3+) in the Escherichia coli inactivation in artificial seawater

Comparative effect of simulated solar light, UV, UV/H2O2 and photo-Fenton treatment (UV–Vis/H2O2/Fe2+,3+) in the Escherichia coli inactivation in artificial seawater

Role of iron species in the photo-transformation of phenol in artificial and natural seawater

Degradação de BTXs via processos oxidativos avançados

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