New insights into the mechanism of heterogeneous activation of nano–magnetite by microwave irradiation for use as Fenton catalyst

Vieira, Yasmin; Silvestri, Siara; Leichtweis, Jandira; Jahn, Sérgío Luiz; Flores, Érico Marlon de Moraes; Dotto, Guilherme L.; Foletto, Edson Luiz

doi:10.1016/j.jece.2020.103787

Cited by 30 publications

(9 citation statements)

References 41 publications

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“…The H 2 O 2 treatment can easily remove the cyanide, thiocyanate, nitrite, chloride, hypochlorite, and organic matter (Chidambara Raj and Quen, 2005). It can also be used in an advanced oxidation process involving more complex reactions as a source of hydroxyl radicals (Chidambara Raj and Quen, 2005;Vieira et al 2020aVieira et al , 2020b. H 2 O 2 is used in the bulk sludge biological treatment as a source of oxygen and to prevent denitrification in the settling tanks.…”

Section: Role Of Oxidizing Agentmentioning

confidence: 99%

Progress and prospective of heterogeneous catalysts for H2O2 production via anthraquinone process

Ingle

Ansari

Shende

et al. 2022

Environ Sci Pollut Res

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This paper reviews the improvement in the field of catalytic hydrogenation of 2-ethylanthraquinone to 2-ethylanthrahydroquinone for the successful production of hydrogen peroxide. Hydrogen peroxide is being used in almost all industrial areas, particularly in the chemical industry and in environmental protection, as the most promising oxidant for cleaner and environmentally safer processes. A variety of hydrogenation catalysts have been introduced for hydrogenation of 2-ethylanthraquinone in the production of hydrogen peroxide via anthraquinone (AQ) process. The aim of the present study is to describe the catalysts used in the hydrogenation of 2-ethylanthraquinone and the reaction mechanism involved with different catalytic systems. The hydrogenation of 2-ethylanthraquinone using metals, alloy, bimetallic composite, and supported metal catalyst with the structural modifications has been incorporated for the production of hydrogen peroxide. The comprehensive comparison reveals that the supported metal catalysts required lesser catalyst amount, produced lower AQ decay, and provided higher catalyst activity and selectivity. Furthermore, the replacement of conventional catalysts by metal and metal alloy-supported catalyst rises as a hydrogenation trend, enhancing by several times the catalytic performance.

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Section: Role Of Oxidizing Agentmentioning

confidence: 99%

Progress and prospective of heterogeneous catalysts for H2O2 production via anthraquinone process

Ingle

Ansari

Shende

et al. 2022

Environ Sci Pollut Res

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“…Pore radius of NM, KC, and NC is 4.55, 3.14, and 3.64 nm, respectively, confirming that all samples are mesoporous. The pore size of NC is less than NM by about 20% owing to the effect of polymer inserted into the structure of NM during composite formation [50,51].…”

Section: Characterization Of Nanoadsorbents and Photocatalystsmentioning

confidence: 99%

Adsorption and Photo-Fenton Degradation of Methylene Blue Using Nanomagnetite/Potassium Carrageenan Bio-Composite Beads

et al. 2022

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The present study deals with the preparation of nanomagnetite (NM), potassium carrageenan (KC), and nanomagnetite/potassium carrageenan bio-composite beads (NC). Characterization of the prepared solid materials using different physicochemical techniques such as X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscope (TEM), energy-disperse X-ray spectroscopy (EDX), diffuse reflectance spectrophotometer (DRS), swelling ratio (SR%), N2 adsorption, pH of point of zero charges (pHPZC), and Fourier transform infrared spectroscopy (FTIR). Comparing between adsorption and photo-Fenton degradation process for methylene blue (MB) on the surface of the prepared solid materials. Nanomagnetite/potassium carrageenan bio-composite (NC) exhibited high specific surface area (406 m2/g), mesoporosity (pore radius, 3.64 nm), point of zero charge around pH6.0, and the occurrence of abundant oxygen-containing functional groups. Comparison between adsorption and photo-Fenton oxidation process for methylene blue (MB) was carried out under different application conditions. NC exhibited the maximum adsorption capacity with 374.50 mg/g at 40 °C after 24 h of shaking time while 96.9% of MB was completely degraded after 20 min of photo-Fenton process. Langmuir's adsorption model for MB onto the investigated solid materials is the best-fitted adsorption model based on the higher correlation coefficient values (0.9771–0.9999). Kinetic and thermodynamic measurements prove that adsorption follows PSO, endothermic, and spontaneous process, while photo-Fenton degradation of MB achieves PFO, nonspontaneous, and endothermic process. Photo-Fenton degradation is a fast and simple technique at a lower concentration of dye (< 40 mg/L) while at higher dye concentration, the adsorption process is preferred in the removal of that dye.

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“…In view of this, researchers have focused on developing more ecological and cost-effective catalytic processes which has largely impacted the concept and design of catalytic materials. One approach that has begun to emerge as a greener alternative for the fabrication of nanosctructured catalytic architectures is the use of biological substrates (BS) as both the reducing and stabilizing agents normally required in the synthesis of nanomaterials as substitutes for harmful precursors including surfactants, organometallic compounds, metal hydrides and so forth (Camargo et al, 2009;Ma et al, 2019;Vieira et al, 2020). In heterogeneous solid-liquid catalytic systems, the use of magnetic nanocomposites as support allows an easy dispersion in the reaction medium and a quick recovery and recycling of the catalyst when compared to the commonly used centrifugation or filtration processes (Miceli et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Magnetite (Fe3O4) is an example of iron oxide that shows a considerate enhanced magnetism, defined as superparamagnetism, when one of its dimensions are reduced to the nanoscale. Thus, Fe3O4 nanoparticles have been utilized as catalyst/support and co-catalyst in a variety of reactions including Fenton-type oxidations, Hydrogenation of arenes and olefins, Oxidation of alcohols/olefins and nitro compound reduction (Ma et al, 2019;Vieira et al, 2020). In the past decade, the use of zinc oxide in the fabrication of magnetic core@shell structures has increased remarkably (Ammar et al, 2020;Wang et al, 2016;Wu et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of Fe3O4@ZnO-supported Pd nanoparticles for oxidation and hydrogenation reactions in liquid systems

Souto

Razini²,

Kauffmann³

et al. 2022

RSD

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In this work Pd nanoparticles immobilized on a hybrid solid support comprised of Fe3O4 coated by a ZnO layer were synthesized by a green method which makes use of water, a biological substrate from a local plant (Rhamnidium elaeocarpum) and inexpensive Fe3+ and Zn2+ salts. 1H-NMR and 13C-NM revealed β-sitosterol as the main component of the biological substrate. The catalytic support containing Pd nanoparticles was applied in three model solid-liquid catalytic systems, namely: alcohol oxidation, nitrocompound reduction and olefin hydrogenation. For the alcohol oxidation, benzyl alcohol was used as the substrate in a solvent-free condition with high selectivity towards benzaldehyde, and a single sample of the catalyst could be recycled up to 11 times before any loss of activity could be detected. TOF (turnover frequency) as high as 13,686 h-1 for the substrate oxidation was achieved with an average yield rate of 45.4% for formation of benzaldehyde and 81.6% of average substrate conversion after 6 catalytic cycles. For the hydrogenation experiments using cyclohexene and 4-nitrophenol as model substrates, conversion as high as 96% to 4-aminophenol and cyclohexane, respectively, was achieved after 30 minutes of reaction. Furthermore, a single sample of the catalyst could be recycled for up to 17 times for the reduction of 4-nitrophenol, and 21 times in the hydrogenation of cyclohexene. Catalytic recycling for all studied reactions was straightforward after due to the superparamagnetic property of the material, and catalyst isolation after each batch could be rapidly carried out using a Nd magnet. These results suggests that a highly active and stable catalytic system based on Pd nanoparticles supported on a multifunctional solid could be fabricated using green and inexpensive biomass under operationally simple synthesis conditions.

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New insights into the mechanism of heterogeneous activation of nano–magnetite by microwave irradiation for use as Fenton catalyst

Cited by 30 publications

References 41 publications

Progress and prospective of heterogeneous catalysts for H2O2 production via anthraquinone process

Progress and prospective of heterogeneous catalysts for H2O2 production via anthraquinone process

Adsorption and Photo-Fenton Degradation of Methylene Blue Using Nanomagnetite/Potassium Carrageenan Bio-Composite Beads

Green synthesis of Fe3O4@ZnO-supported Pd nanoparticles for oxidation and hydrogenation reactions in liquid systems

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