Catalytic activity of an iron-pillared montmorillonitic clay mineral in heterogeneous photo-Fenton process

León, María Andrea De; Castiglioni, Jorge; Bussi, Juan; Sergio, Marta

doi:10.1016/j.cattod.2007.12.130

Cited by 84 publications

(33 citation statements)

References 22 publications

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“…In particular, many researchers showed that when using bentonite and montmorillonite clays, the Fe-PILC has basal spacings of up to 10-20 Å and BET surface area reaching up to 300 m 2 /g [16]. Montmorillonites in particular constitute one of the most abundant smectitic clays in nature [23]. They are characterized by the substitution of Al 3+ by Mg 2+ in the octahedral sheet, resulting in a negative layer charge that is compensated by hydrated cations adsorbed in the interlamellar space.…”

Section: The Use Of Pillared Clays In Heterogeneous Fenton-based Procmentioning

confidence: 99%

Use of Pillared Clay-Based Catalysts for Wastewater Treatment Through Fenton-Like Processes

Herney-Ramírez

Madeira

2010

Pillared Clays and Related Catalysts

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Clays, both natural and physical-chemically modified, are attractive materials for the preparation of supported catalysts. In this chapter, a review is made regarding the use of pillared interlayered clays (PILCs) in heterogeneous Fentonlike advanced oxidation processes. Their applications in pollutants degradation is summarized, with particular emphasis on the effect of the main operating conditions (e.g., initial H 2 O 2 or parent compound concentration, catalyst load, pH, or temperature) on oxidation efficiency. Special attention is also given to the type of catalyst or precursor used, to the importance and advantages of the heterogeneous versus homogeneous process, and to significant aspects like catalyst stability. Among the technological issues that are of concern, the importance of using continuous flow reactors (e.g., fixed-bed) is discussed. Finally, some mechanistic studies are reviewed as well as modeling works, based on phenomenological or semi-empiric models (e.g., using statistic tools like design of experiments).

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Section: The Use Of Pillared Clays In Heterogeneous Fenton-based Procmentioning

confidence: 99%

Use of Pillared Clay-Based Catalysts for Wastewater Treatment Through Fenton-Like Processes

Herney-Ramírez

Madeira

2010

Pillared Clays and Related Catalysts

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“…This disadvantage can be eliminated by utilizing solid materials to support the iron species, maintaining at the same time, a reasonable efficiency of the process. Using this approach, different materials have been studied in photochemical reactors and among these, zeolitic materials [13][14][15][16], pillared clays [11,[17][18][19], alumina [20], Nafion membranes [21][22][23], ionexchange resins [6,[24][25][26], silice [27], silica [28,29] alginate [30] and ashes [31] stand out. On the other hand, there are some studies that evaluate the effects of supported iron species in Fenton processes [32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous photo-electro-Fenton process using different iron supporting materials

Ramirez¹,

Godı́nez²,

Méndez³

et al. 2010

J Appl Electrochem

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In this work, the application of heterogeneous photo-electro-Fenton processes using iron supported on Nafion membranes and ion exchange amberlite and purolite resins is studied. Spectroscopic and TOC results using as a model pollutant an aqueous Orange II dye solution indicate that the process can be carried out with any of the iron supporting materials under study. While the resins can incorporate between 59 and 65 mg Fe/g of substrate, a Nafion membrane can fix 45 mg Fe/g of supporting material. Iron desorption analysis after a photo-electroFenton degradation test on the other hand, indicates that the ion exchange resins and the Nafion membrane hold more than 90% of iron. An alkaline rinse after the activation exchange process for the amberlite resin and the Nafion membrane, results in a larger stability of the fixed iron species.

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“…This result was different from that in the homogeneous Fenton system. In homogeneous Fenton reaction, less photoactive materials Fe 3+ (H 2 O) 6 would be generated at lower pH and Fe(OH) 3 at higher pH, [18,28] and the optimal pH in the homogeneous Fenton reaction was around 3. [41] However, the Fe-Y molecular sieve can be effective in the broad pH from 2.2 to 7.2 in this study.…”

Section: Effect Of Phmentioning

confidence: 99%

“…These results can be explained by the fact that the presence of UV radiation increased the amount of the hydroxyl radical produced by the photoreduction reaction of Fe(III) (Reaction (1)) [37][38][39] and the decomposition of hydrogen peroxide (Reaction(2)). [28,40] Fe…”

Section: Characterization Of Fe-y Molecular Sieve Catalystmentioning

confidence: 99%

“…[19] One of the most practical ways to overcome these limitations is to use Fenton heterogeneous catalysts and introduce ultraviolet (UV) irradiation. The porous-activated carbon, [20][21][22][23] zeolites, [24][25][26] resin, [27] clays, [28,29] and mesoporous silica [30][31][32][33] were used as supporters more often. However, these researchers indicated that there were still some drawbacks, such as low iron loading (only 0.1-5%), pH range extending not obvious, week stability, iron leached phenomenon, and so on.…”

Section: Introductionmentioning

confidence: 99%

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Degradation of bisphenol A in water by the heterogeneous photo-Fenton

Jiang

Guo

et al. 2013

Environmental Technology

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Bisphenol A (BPA) is a kind of a controversial endocrine disruptor, and is ubiquitous in environment. The degradation of BPA with the heterogeneous photo-Fenton system was demonstrated in this study. The Fe-Y molecular sieve catalyst was prepared with the ion exchange method, and it was characterized by X-ray radiation diffraction (XRD). The effects of pH, initial concentration of H 2 O 2 , initial BPA concentration, and irradiation intensity on the degradation of BPA were investigated. The service life and iron solubility of catalyst were also tested. XRD test shows that the major phase of the Fe-Y catalyst was Fe 2 O 3 . The method of heterogeneous photo-Fenton with Fe-Y catalyst was superior to photolysis, photo-oxidation with only hydrogen, heterogeneous Fenton, and homogeneous photo-Fenton approaches. pH value had no obvious effects on BPA degradation over the range of 2.2-7.2. The initial concentration of H 2 O 2 had an optimal value of 20 × 10 −4 mol/L. The decrease in initial concentration of BPA was favourable for degradation. The intensity of ultraviolet irradiation has no obvious effect on the BPA removal. The stability tests indicated that the Fe-Y catalyst can be reused and iron solubility concentration ranged from NA to 0.0062 mg/L. Based on the results, the heterogeneous photo-Fenton treatment is the available method for the degradation of BPA.

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Catalytic activity of an iron-pillared montmorillonitic clay mineral in heterogeneous photo-Fenton process

Cited by 84 publications

References 22 publications

Use of Pillared Clay-Based Catalysts for Wastewater Treatment Through Fenton-Like Processes

Use of Pillared Clay-Based Catalysts for Wastewater Treatment Through Fenton-Like Processes

Heterogeneous photo-electro-Fenton process using different iron supporting materials

Degradation of bisphenol A in water by the heterogeneous photo-Fenton

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