Heterogeneous Fenton’s oxidation using Fe/ZSM-5 as catalyst in a continuous stirred tank reactor

Queirós, Sónia Isabel; Morais, V. S.; Rodrigues, Carmen S.D.; Maldonado-Hódar, Francisco J.; Madeira, Luís M.

doi:10.1016/j.seppur.2014.11.046

Cited by 44 publications

(22 citation statements)

References 42 publications

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“…Several works have demonstrated that the use of different supports to disperse iron oxides lead to greater efficiency in catalytic oxidation processes [5][6][7] . Among the various available supports, ZSM-5 zeolite has been widely used as catalyst support in Fenton oxidation systems due to their intrinsic properties such as thermal stability, high surface area, and uniform pores and channels [8][9][10] . However, the catalytic efficiency of ZSM-5 zeolite may be severely limited due to their microporous nature, which restricts the access of reactant molecules to active catalyst sites located inside of the zeolite crystals 11,12 .…”

Section: Introductionmentioning

confidence: 99%

Preparation of Mesoporous Fe2O3-Supported ZSM-5 Zeolites by Carbon-Templating and their Evaluation as Photo-Fenton Catalysts to Degrade Organic Pollutant

et al. 2016

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Mesoporous Fe 2 O 3 -supported ZSM-5 zeolites were prepared by carbon-templating and subsequently evaluated as photo-Fenton catalysts to degrade a dye used as a model heavy organic pollutant. The synthesis procedure of the mesoporous ZSM-5 zeolites was performed employing a nucleating gel and carbon particles as mesopores template. Thereafter, the precursor salt of the iron oxide (Fe 2 O 3 ) was impregnated and then calcined to obtain the final catalyst. For comparison purposes, a conventional Fe 2 O 3 -supported ZSM-5 zeolite was also prepared. The results showed that the amount of intracrystalline mesopores formed in the ZSM-5 crystals was influenced by the amount of carbon added into the synthesis mixture. In comparison to the conventional prepared catalyst, the mesoporous Fe 2 O 3 /ZSM-5 ones showed an improved performance in the degradation of the target organic pollutant by the photo-Fenton reaction, which was attributed to the improvement of their textural properties as consequence of the mesopores generation.

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Section: Introductionmentioning

confidence: 99%

Preparation of Mesoporous Fe2O3-Supported ZSM-5 Zeolites by Carbon-Templating and their Evaluation as Photo-Fenton Catalysts to Degrade Organic Pollutant

et al. 2016

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“…Therefore, one of the main topics of these studies focused on increasing the reaction rate by optimizing the components, morphology, supports, preparation methods and reaction parameters. Among the rapid growth of literatures reported, iron-based heterogeneous Fenton-like catalysts, which is mainly composed of environmental friendly element and low cost, are intensively studied [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Fe Oxides Loaded on Carbon Cloth by Hydrothermal Process as an Effective and Reusable Heterogenous Fenton Catalyst

2018

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Iron based heterogeneous Fenton catalysts are attracting much attention for its economic and environmental friendly characteristics. In this study, iron oxides loaded carbon cloth (assigned as Fe@CC) was prepared using hydrothermal hydrolysis of Fe(NO 3 ) 3 . The specific surface area of Fe@CC determined by N 2 adsorption-desorption Brunauer-Emmett-Teller method was up to 1325.5 m 2 /g, which increased by 81.8% compared with that of native carbon cloth mainly due to the loading of iron oxide. XPS (X-ray photoelectron spectroscopy) spectra confirmed that the iron oxide on the carbon surface included mainly FeOOH. Its heterogeneous Fenton-like activity was determined using Acid Red G as a model substrate for degradation. Fe@CC maintained high and relatively stable activity during 11 tests, and it showed high COD (Chemical Oxygen Demand) removal efficiency and high apparent H 2 O 2 utilization efficiency. The homogeneous Fenton reaction using the amount of leached Fe(III) suggested that the surficial reaction on Fe@CC was dominant. The stability and the mechanism for gradual decrease of activity during the first 4 tests were also discussed.

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“…It utilizes H 2 O 2 and iron-based catalysts (Eq. Iron oxides supported on the ZSM-5 zeolites have shown high surface area, extraordinary stability, and remarkable porosity [21][22][23] . To overcome these difficulties, heterogeneous processes were considered as viable and attractive alternatives.…”

Section: Introductionmentioning

confidence: 99%

Treatment of textile effluent containing recalcitrant dyes using MOF derived Fe-ZSM-5 heterogeneous catalyst

et al. 2016

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Iron based heterogeneous catalysts are widely used in many industrial applications includingFenton Oxidation Processes (FOPs) to treat the effluents containing recalcitrant contaminants such as dyes. In this work, Metal Organic Framework (MOF) derived iron nano oxide particles supported on ZSM-5 Zeolite were synthesized under the optimized experimental conditions. Central Composite Design (CCD) method was employed to optimize the yield of the catalyst. The catalyst was then characterized using EDX, SEM, HRTEM, FTIR, STA and BET. Subsequently, the catalytic activity of the catalyst in Fenton Oxidation process was evaluated based on the degradation of the model azo dyes, Acid Blue 113, Methyl Orange, and Reactive Black. The optimized experimental yield was 81.5%, which was in agreement with the CCD predicted. Apart from high catalyst's yield, excellent mineralization efficiency was obtained where 77%, 71 % and 68% of Total Organic Carbon (TOC) removal were achieved for Acid Blue 113, Methyl Orange, and Reactive Black 5, respectively. Based on the yield and activity, it was concluded that the synthesized Fe-ZSM-5 is a promising catalyst for Fenton oxidation process.The specific surface area of the support and catalyst (in m2/g) was determined by measuring the volume of N 2 gas, using the BET (Brunauer-Emmett-Teller) method. Table S3 shows the specific surface areas, pore width, and pore volume. Presence of nano sized iron particles reduced the specific surface area of ZSM-5 from 297 to 241m 2 /g. Similarly, the pore volume was also changed from 0.17 to 0.11cm 3 /g. BET analysis confirmed the filling of iron oxide particles in the pores of ZSM-5 matrix 28 . Synthesized Fe-ZSM-5 had greater pore size (2.66 nm) than the parent ZSM-5 (2.45 nm).This may be attributed to multilayer formation of nano sized particles on ZSM-5 support, which can be seen FESEM images (Fig. 2). Changes in the pore size, and surface area were well supported by the literature 7, 28, 42 .Comparison Plot for Fe-MOFs.The optimization of the results obtained through experiments was carried out using Response Surface Methodology (RSM). Responses were kept within the desired ranges while the maximum yield was targeted. The suggested optimized values of temperature (33 o C), time (4 h) and stirrer speed (245 rpm) were validated through the experiment. The approximate yield of the Fe-complexes was 81.5%. There was a good agreement between the predicted and experimental results under optimized environment.Furthermore, in the impregnation step, 82-84% yield of Fe-ZSM-5 was observed. The yield can be further increased up to 90% with an efficient filtration system. Efficiency and Stability Evaluation of the Fe-ZSM-5 catalystExperiments exhibiting Fenton oxidation were carried out to degrade and decolorize three selected dyes. In order to examine the adsorption, the preliminary study was conducted with 100 mg/L of dye concentration. After four hours, percentage of adsorbed Acid Blue 113,

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Heterogeneous Fenton’s oxidation using Fe/ZSM-5 as catalyst in a continuous stirred tank reactor

Cited by 44 publications

References 42 publications

Preparation of Mesoporous Fe2O3-Supported ZSM-5 Zeolites by Carbon-Templating and their Evaluation as Photo-Fenton Catalysts to Degrade Organic Pollutant

Preparation of Mesoporous Fe2O3-Supported ZSM-5 Zeolites by Carbon-Templating and their Evaluation as Photo-Fenton Catalysts to Degrade Organic Pollutant

Fe Oxides Loaded on Carbon Cloth by Hydrothermal Process as an Effective and Reusable Heterogenous Fenton Catalyst

Treatment of textile effluent containing recalcitrant dyes using MOF derived Fe-ZSM-5 heterogeneous catalyst

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