Modified goethites as catalyst for oxidation of quinoline: Evidence of heterogeneous Fenton process

Guimarães, Iara do Rosário; Oliveira, Luiz C.A.; Queiroz, Paulo F.; Ramalho, Teodorico C.; Pereira, Márcio C.; Fabris, José Domingos; Ardisson, José D.

doi:10.1016/j.apcata.2008.06.001

Cited by 61 publications

(30 citation statements)

References 15 publications

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“…1,2) in homogeneous and heterogeneous systems [4][5][6]. However, the homogeneous system has been gradually replaced by active heterogeneous processes in catalysis research due to the generation of large amounts of sludge caused by precipitation of ferric hydroxide, the necessity of operating at pH & 3, and the difficulty of catalyst recovery [1].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen Treatment on the Catalytic Activity of Iron Oxide Based Materials Dispersed Over Activated Carbon: Investigations Toward Hydrogen Peroxide Decomposition

2009

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The effect of hydrogen treatment (400°C/1 h) on the catalytic properties toward H 2 O 2 decomposition of iron oxide based materials dispersed over activated carbon were investigated. Two different supports were evaluated: a commercial activated carbon (ACM) and an activated carbon produced from spent coffee grounds (ACR). The catalysts were characterized using XRD, SEM, N 2 -sorption, XPS and TPR analysis. The main results suggest the formation of composites with high surface area ([800 m 2 g -1 ) and the hydrogen treatment resulted in a great increase in the catalytic activity, probably as a function of the reduced iron species (Fe 2? and Fe 0 ) formed with the treatment. Moreover, the catalyst prepared with ACR showed to be more active than that prepared from ACM.

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Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen Treatment on the Catalytic Activity of Iron Oxide Based Materials Dispersed Over Activated Carbon: Investigations Toward Hydrogen Peroxide Decomposition

2009

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“…Besides the traditional treatments of humic acids [5][6][7][8], studies of the degradation of HA have been carried out with advanced oxidation processes (AOPs) [9][10][11][12][13], among which the heterogeneous Fenton system has attracted great attention due to its formation of highly potent chemical species, • OH, for non-selective oxidation [14,15]. Zero valent iron has been widely used in different environmental treatment processes [16,17] and the direct electron transfer from Fe 0 to H 2 O 2 during a Fenton reaction is a very slow process at neutral pH [18].…”

Section: Introductionmentioning

confidence: 99%

Degradation characteristics of humic acid over iron oxides/Fe0 core–shell nanoparticles with UVA/H2O2

Nie

Zhou

et al. 2010

Journal of Hazardous Materials

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a b s t r a c tIron oxides coated on Fe 0 core-shell nanospheres (nIOCI) were synthesized through the reduction of ferrous sulfate aqueous solution by sodium borohydride at ambient atmosphere. The catalyst was highly effective for the degradation of humic acid (HA) in the presence of H 2 O 2 and UVA at neutral pH. Under deoxygenated conditions in the dark, the generation of hydroxyl radicals in aqueous nIOCI dispersion verified its galvanic cell-like performance, which enhanced the interfacial electron transfer and led to its higher reactivity. By the total organic carbon, the absorbance of UV 254 , FTIR, the molecular weight distribution and the chemical fractional character analysis, the degradation process of HA was shown to proceed by the disappearance of aromaticity, the increase of hydrophilic fraction and aromatic ring openings into CO 2 and small organic acid. The treated HA showed much lower reactivity toward chlorine and the disinfection byproduct (DBP) formation potential was also greatly reduced. Moreover, it was found that the DBP formation potential more depended on the structure of the intermediates of HA degradation than TOC removal.Crown

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“…Quase todas as rochas e solos contêm ao menos traços de ferro. 2 A maior parte do ferro da crosta terrestre está presente na forma de Fe 2+ , mas é rapidamente oxidada na superfície a Fe 3+ . Os principais minérios de ferro de ocorrência natural são hematita (aFe 2 O 3 ), 70% em massa de ferro, goethita (aFeOOH), 63% em massa de ferro, e magnetita que também apresenta altos teores de ferro, 72% em massa.…”

Section: Introductionunclassified

“…Os principais minérios de ferro de ocorrência natural são hematita (aFe 2 O 3 ), 70% em massa de ferro, goethita (aFeOOH), 63% em massa de ferro, e magnetita que também apresenta altos teores de ferro, 72% em massa. 2 Esses óxidos representam uma família de materiais com notável diversidade de propriedades e uma química muito interessante devido às suas propriedades magnéticas, elétricas, físico-químicas e morfológicas, que os tornam muito importantes do ponto de vista científico e tecnológico. Dentre os diversos campos em que os óxidos de ferro são aplicados destacam-se os processos envolvendo adsorção e catálise, que têm atraído grande interesse, devido, principalmente, às suas propriedades redoxes e texturais.…”

Section: Introductionunclassified

Óxidos de ferro e suas aplicações em processos catalíticos: uma revisão

Oliveira¹,

Fabris²,

Pereira³

2013

Quím. Nova

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Modified goethites as catalyst for oxidation of quinoline: Evidence of heterogeneous Fenton process

Cited by 61 publications

References 15 publications

Effect of Hydrogen Treatment on the Catalytic Activity of Iron Oxide Based Materials Dispersed Over Activated Carbon: Investigations Toward Hydrogen Peroxide Decomposition

Effect of Hydrogen Treatment on the Catalytic Activity of Iron Oxide Based Materials Dispersed Over Activated Carbon: Investigations Toward Hydrogen Peroxide Decomposition

Degradation characteristics of humic acid over iron oxides/Fe0 core–shell nanoparticles with UVA/H2O2

Óxidos de ferro e suas aplicações em processos catalíticos: uma revisão

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