Effects of niobium and molybdenum impregnation on adsorption capacity and Fenton catalytic activity of magnetite

Aziz, Abdul; Daud, Wan Mohd Ashri Wan; Shafeeyan, Mohammad Saleh

doi:10.1039/c5ra15660b

Cited by 30 publications

(4 citation statements)

References 34 publications

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“…The current scientific literature indicates the wide use of many techniques for the treatment of wastewater against common pollutants. They include membrane techniques (Szczygielda and Prochaska 2018), adsorption (Bartczak et al 2015), biocatalysis (Antecka et al 2018) and photocatalysis (Rahim Pouran et al 2015. Methods such as membrane techniques or biocatalysis are classed as high-cost processes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

et al. 2019

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A TiO 2 -ZnO binary oxide system (with molar ratio TiO 2 :ZnO = 8:2) was synthesized by a hydrothermal method, assisted by calcination at temperatures of 500, 600 and 700 °C, using zinc citrate as the precursor of ZnO. The morphology (SEM, TEM), crystalline structure (XRD, Raman spectroscopy), diffuse reflectance spectra (DRS), chemical surface composition (EDXRF), porous structure parameters (low-temperature N 2 sorption) and characteristic functional groups (FT-IR) of the TiO 2 -ZnO oxide materials were comprehensively analyzed. The novelty of this work is the observation of the coexistence of the crystalline structures of anatase and ZnTiO 3 in TiO 2 -ZnO oxide materials. Moreover, it is shown that the obtained materials absorb visible radiation. The key stage of the study was the evaluation of the photocatalytic activity of the TiO 2 -ZnO binary oxide systems in the degradation of model organic pollutants: C.I. Basic Red 1, C.I. Basic Violet 10, C.I. Basic Blue 3 and 4-nitrophenol. For all synthesized materials, a high efficiency of degradation of the model organic impurities was demonstrated. The results show that the synthesized products may be materials of interest for use in the degradation of organic pollutants. Moreover, the kinetics of the photocatalytic degradation of selected organic compounds were determined based on the Langmuir-Hinshelwood equation, assuming a pseudo-first-order (PFO) reaction.

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Section: Introductionmentioning

confidence: 99%

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

et al. 2019

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“…Conventional treatment methods such as homogenous advanced oxidation treatments using iron based catalysts are used to degrade and decolorize recalcitrant contaminants 2 . A variety of catalytic materials such as Fe, Cu, MnO 2 , Ni 2 O 3 , ZnO, Pt, and TiO 2 supported on pillared clay, zeolites or activated carbons have been used as heterogeneous catalysts 3,[12][13][14][15][16][17] . It utilizes H 2 O 2 and iron-based catalysts (Eq.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11] A variety of catalytic materials such as Fe, Cu, MnO 2 , Ni 2 O 3 , ZnO, Pt, and TiO 2 supported on pillared clay, zeolites or activated carbons have been used as heterogeneous catalysts. 3,[12][13][14][15][16][17] Iron based catalysts supported on zeolites supports have been found more efficient compared to the other supported iron catalysts. 15,[18][19][20][21] Iron oxides supported on the ZSM-5 zeolites have shown high surface area, extraordinary stability, and remarkable porosity.…”

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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“…Moreover, the catalyst is not recoverable. 30 In contrast, in heterogeneous reaction, the iron oxides could be simply separated from the solution by magnet and reused for several runs with inconsiderable decrease in their efficiency. 31 In light of this, future studies should focus on production of new heterogeneous catalysts that not only overcome homogeneous Fenton shortcomings but activate Fenton reaction effectively.…”

Section: Comparison Between Homogeneous and Heterogeneous Processesmentioning

confidence: 99%

A Comparative Study on a Cationic Dye Removal through Homogeneous and Heterogeneous Fenton Oxidation Systems

Bayrami

Shafeeyan

Raman

et al. 2018

ACSi

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Oxidative treatment of a cationic dye solution, methylene blue, was investigated using magnetite nanoparticles and goethite in heterogeneous Fenton-like reaction, and ferrous ions in homogeneous Fenton-reaction. The aim was to compare the degradation efficiencies of the studied catalysts for decolorization of methylene blue solution as the model organic pollutant. Response surface methodology (RSM) was applied to determine the optimal operational conditions for magnetite/H 2 O 2 and goethite/H 2 O 2 systems. The [H 2 O 2 ] of 0.2 M, catalyst dosage of 1 g/L, pH 9.0 and reaction time of 5h were chosen by RSM. The pH value of 3.0 was used in the case of Fe +2 /H 2 O 2 system. The experimental results showed that homogeneous Fenton oxidation system was the most effective system under both acidic and neutral conditions but decreased at pH value of 9.0 due to the decrease in available Fe 2+ ions in the solution and generation of ferric hydroxide sludge. Fe 3 O 4 /H 2 O 2 system represented better removal efficiency than FeO(OH)/H 2 O 2 system that could be attributed to the presence of Fe II cations in magnetite structure and its larger surface area.

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Effects of niobium and molybdenum impregnation on adsorption capacity and Fenton catalytic activity of magnetite

Cited by 30 publications

References 34 publications

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

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

A Comparative Study on a Cationic Dye Removal through Homogeneous and Heterogeneous Fenton Oxidation Systems

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