Degradation of 4-chlorophenol from wastewater through heterogeneous Fenton and photo-Fenton process, catalyzed by Al–Fe PILC

Catrinescu, Cezar; Arsene, Daniela; Apopei, Petru; Teodosiu, Carmen

doi:10.1016/j.clay.2012.01.019

Cited by 82 publications

(40 citation statements)

References 20 publications

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“…The main reasons are related to poisoning, reduction of the catalyst surface and, overall, leaching of iron [28][29][30][31][32]. Thus, the development of more active and stable catalysts represents nowadays one of the most important challenges in CWPO.…”

Section: Heterogeneous Fenton Processmentioning

confidence: 99%

Preparation of magnetite-based catalysts and their application in heterogeneous Fenton oxidation – A review

Muñoz

Pedro

Casas

et al. 2015

Applied Catalysis B: Environmental

666

274

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Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: AbstractThis study presents a critical review on the application of magnetite-based catalysts to industrial wastewater decontamination by heterogeneous Fenton oxidation. The use of magnetic materials in this field started only around 2008 and continues growing increasingly year by year. The potential of these materials derives from their higher ability for degradation of recalcitrant pollutants compared to the conventional iron-supported catalysts due to the presence of both Fe(II) and Fe(III) species. In addition, their magnetic properties allow their easy, fast and inexpensive separation from the reaction medium. The magnetic materials applied up to now can be classified in three general groups: magnetic natural minerals, in-situ-produced magnetic materials and ferromagnetic nanoparticles. A survey of the catalysts investigated so far is presented paying attention to their nature and competitive features in terms of activity and durability.2

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Section: Heterogeneous Fenton Processmentioning

confidence: 99%

Preparation of magnetite-based catalysts and their application in heterogeneous Fenton oxidation – A review

Muñoz

Pedro

Casas

et al. 2015

Applied Catalysis B: Environmental

666

274

View full text Add to dashboard Cite

show abstract

“…Ultimamente diversos estudos estão sendo realizados com esses materiais, como por exemplo: Zr-Fe-PILC (Molina et al, 2006) e Fe-Cr-PILC (Tomul, 2012) na oxidação catalítica de fenol, Al-Cu-PILC na oxidação de alaranjado de metila (Galeano et al, 2010), Al-Fe-PILC para oxidação catalítica de 4-clorofenol (Catrinescu et al, 2012) e Cr-Al-PILC na desidrogenação oxidativa de propano (León et al, 2014).…”

Section: Introductionunclassified

SÍNTESE E CARACTERIZAÇÃO DE UMA ARGILA BENTONÍTICA PILARIZADA COM PILARES MISTOS DE Al/Fe E IMPREGNADA COM Pd

Silva¹,

Torres²,

Ferreira³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -Bentonitas pilarizadas com pilares mistos de Al/Fe são excelentes catalisadores de reações de oxidação. Quando o Pd é impregnado, esses materiais se tornam catalisadores de reações de hidrodescloração e oxidação ao mesmo tempo, por exemplo. Neste trabalho, uma bentonita norte-americana foi pilarizada com polihidroxicátions de Al e Fe, gerando a Al-Fe-PILC. Em seguida o Pd foi impregnado ao material, gerando a Pd-Al-Fe-PILC. As amostras foram caracterizadas por DRX, ATD/TG e pela análise de área superficial específica (ASE) pelo método BET. Houve um aumento do espaçamento basal da bentonita de 12,4 A° na amostra original para 17,81 A° na Al-Fe-PILC e 17,05 A° na PdAl-Fe-PILC. A ASE aumentou de 19,05 m 2 /g na amostra original para 173,49 m 2 /g na Al-Fe-PILC e 92 m 2 /g na Pd-Al-Fe-PILC. As estabilidades térmicas dos materiais foram bastante elevadas, com a desidroxilação (colapso parcial da estrutura) ocorrendo em torno de 678°C. O processo de pilarização ocorreu com sucesso e os materiais sintetizados possuem grande potencial para serem utilizados como catalisadores. INTRODUÇÃOArgilas pilarizadas são materiais que possuem porosidade permanente, obtida através da introdução de compostos químicos que funcionam como pilares de dimensão molecular entre as lamelas da argila, mantendo-as afastadas e dando origem aos microporos. Os compostos químicos que funcionam como suportes ou pilares moleculares entre as lamelas da argila são denominados agentes pilarizantes. A simples introdução do agente pilarizante por troca iônica dá origem às argilas intercaladas. O processo de calcinação que se segue elimina a água presente entre as lamelas produzindo a microporosidade característica das argilas pilarizadas (Luna e Schuchardt, 1999).O processo de preparação de uma argila pilarizada está resumido nos seguintes passos: inchamento da esmectita com água; troca dos cátions interlamelares por complexos metálicos oligoméricos ou poliméricos parcialmente hidratados; secagem e calcinação para transformação dos precursores polioxocátions em pilares de óxido metálico. Nessa última Área temática: Engenharia de Materiais e Nanotecnologia 1

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“…In fact, during the catalytic reaction the induction period was often observed (Belaroui and Bengueddach, 2012;Carriazo et al, 2003;Catrinescu et al, 2012;Kurian and Sugunan, 2006;Luo et al, 2009;Park and Baker, 2002;Timofeeva et al, 2005;Velegraki et al, 2011), but its cause was unclear due to little discussion on the intricate reaction involving catalyst, H 2 O 2 and pollutants (Luo et al, 2009;Velegraki et al, 2011). Some study attributed it to the adsorption of phenol and corresponding to the formation of phenoxy radicals on catalytic surface (Carriazo et al, 2003;Kurian and Sugunan, 2006); some considered it as the result of the dissolution of a portion of ferric ions (Belaroui and Bengueddach, 2012;Catrinescu et al, 2012); while Luo et al (2009) put it down to the protonation of surface iron species since a lower pH shortened the induction period. In short, the detailed investigation to the induction period would be helpful to elucidating the mechanism of heterogeneous catalytic oxidation.…”

Section: Kinetics Of the Oxidation Of 4-cp By H 2 O 2 Over Pilcsmentioning

confidence: 99%

“…So, the development of efficient methods for CP removal was becoming an important field of study. In the last few years, the CWPO technology for the abatement of CP-bearing wastewater using Al-Fe-and Al-Cu-PILCs at room temperature and atmospheric pressure has been shown to be successful (Catrinescu et al, 2011(Catrinescu et al, , 2012Khanikar and Bhattacharyya, 2013;Khankhasaeva et al, 2008;Molina et al, 2010;Zhou et al, 2011a). However, there were still significant knowledge gaps on understanding the kinetic process and interaction mechanism of this complicated Fenton-like reaction.…”

Section: Introductionmentioning

confidence: 99%

“…Little information in literature was available and somewhat conflictive. For example, some researchers considered the dissolution of a portion of iron ions for the homogeneous Fenton reaction to take place (Belaroui and Bengueddach, 2012); others evidenced CPs reacted HO • produced mainly by surface-catalyzed decomposition of H 2 O 2 (Khankhasaeva et al, 2008;Molina et al, 2010);Catrinescu et al (2011Catrinescu et al ( , 2012 showed the presence of two iron species in Al-Fe-PILCs: low-nuclearity ferric oxides and well-ordered hematitelike nanoparticles, and the former seemed to be responsible for the iron leaching and for the differences in the catalytic activity. Further, they suggested a combined heterogeneous-homogeneous mechanism could be envisaged for the reaction system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Catalytic wet peroxide oxidation of 4-chlorophenol over Al-Fe-, Al-Cu-, and Al-Fe-Cu-pillared clays: Sensitivity, kinetics and mechanism

Zhou

Zhang

et al. 2014

Applied Clay Science

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Al-Fe-, Al-Cu-, and Al-Fe-Cu-PILCs were synthesized, characterized and tested in the catalytic wet peroxide oxidation of 4-chlorophenol (4-CP). An apparent induction period followed by a rapid oxidation was observed during the Fenton-like reaction, and the whole reaction could be modeled well using a Fermi's kinetic equation (R 2 = 0.9938~0.9993). The generation of hydroxyl radicals (HO • ) from surface-catalyzed decomposition of H 2 O 2 was the oxidation cause whereas the dissolution of active metals was its result. Accordingly, induction period was the cause of heterogeneous surface activation (catalysis or modification) for more HO • formed by decreasing pH. 4-CP oxidation proceeded via 4-chlorocatechol (major) and hydroquinone (minor) pathways, along the formation of main intermediate (5-chloro-1,2,4-benzentriol). Finally besides CO 2 , H 2 O and Cl − two main compounds (I and II) formed, where the former was identified as 2,4-dioxopentanedioic acid whereas the latter as ferric-oxalate complex. There were marked structural and active differences between Al-Fe-PILC and Al-Cu-PILC in which compared to the latter, the former possessed higher SSA and activity but its optimal calcination temperature was lower and the induction time was also longer. In addition, compound II accounted for a considerable proportion in Al-Fe-PILC system whereas compound I was almost only component in Al-Cu-PILC system.

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Degradation of 4-chlorophenol from wastewater through heterogeneous Fenton and photo-Fenton process, catalyzed by Al–Fe PILC

Cited by 82 publications

References 20 publications

Preparation of magnetite-based catalysts and their application in heterogeneous Fenton oxidation – A review

Preparation of magnetite-based catalysts and their application in heterogeneous Fenton oxidation – A review

SÍNTESE E CARACTERIZAÇÃO DE UMA ARGILA BENTONÍTICA PILARIZADA COM PILARES MISTOS DE Al/Fe E IMPREGNADA COM Pd

Catalytic wet peroxide oxidation of 4-chlorophenol over Al-Fe-, Al-Cu-, and Al-Fe-Cu-pillared clays: Sensitivity, kinetics and mechanism

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