Continuous‐Flow Synthesis of Supported Magnetic Iron Oxide Nanoparticles for Efficient Isoeugenol Conversion into Vanillin

Marquez-Medina, M. Dolores; Prinsen, Pepijn; Li, Hangkong; Shih, Kaimin; Romero, Antonio A.; Luque, Rafael

doi:10.1002/cssc.201701884

Cited by 41 publications

(35 citation statements)

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“…Table S1 (Supplementary Materials) summarizes the materials synthesized. In particular, the employment of biomass residue as a carbon source presents outstanding advantages, since it allows the formation of a magnetic phase without employing other chemicals, such as propionic acid, commonly used for the synthesis of magnetic iron oxide [17]. Nanomaterials synthesized employing iron perchlorate and iron chloride did not show magnetic susceptibility.…”

Section: Resultsmentioning

confidence: 99%

Mechanochemically Synthesized Supported Magnetic Fe-Nanoparticles as Catalysts for Efficient Vanillin Production

et al. 2019

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Magnetically separable nanocatalysts were synthesized by incorporating ironnanoparticles on a mesoporous aluminosilicate (Al-SBA-15) through a mechanochemical grindingpathway in a single step. Noticeably, magnetic features were achieved by employing biomass wasteas a carbon source, which additionally may confer high oxygen functionalities to the resultingmaterial. The resulting catalysts were characterized using X-ray diffraction, X-ray photoelectronspectroscopy, transmission electron microscopy, scanning electron microscopy, porosimetry, andmagnetic susceptibility. The magnetic nanocatalysts were tested in the selective oxidative cleavagereaction of isoeugenol and vanillyl alcohol to vanillin. As a result, the magnetic nanocatalystsdemonstrated high catalytic activity, chemical stability, and enormous separation/reusabilityqualities. The origin of catalytic properties and its relationship with the iron oxide precursor wereanalyzed in terms of the chemical, morphological, and structural properties of the samples. Suchanalysis allows, thus, to highlight the superficial concentration of the iron entities and the interactionwith Al as key factors to obtain a good catalytic response.

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Section: Resultsmentioning

confidence: 99%

Mechanochemically Synthesized Supported Magnetic Fe-Nanoparticles as Catalysts for Efficient Vanillin Production

et al. 2019

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“…9B, absorption bands characteristic of stretching vibration from 1430 to 1520 cm −1 are attributable to absorption of the benzene ring. 72 It can be concluded that the observed deactivation in NM-SCM catalytic activity might be due to adsorption of aromatics including benzene and other high-molecular-weight compounds as side products on the catalyst surface.…”

Section: Identification Of Intermediatesmentioning

confidence: 99%

Heterogeneous catalytic degradation of methylparaben using persulfate activated by natural magnetite; optimization and modeling by response surface methodology

Rostamifasih

Pasalari

Mohammadi

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND In this study, a naturally magnetic semiconductor mineral (NM‐SCM) was used as a highly active, easily separable and green catalyst to activate persulfate (SPS) for the degradation of methylparaben (MeP) in aqueous solution by a heterogeneous catalyst system (SPS/NM‐SCM). NM‐SCM properties were characterized using field emission scanning electron microscope (FESEM), Brunauer–Emmett–Teller (BET), X‐ray diffraction (XRD), energy‐dispersive X‐ray (EDX) and vibrating sample magnetometer (VSM) analyses. The effects of contributing factors such as solution pH, NM‐SCM loading, SPS dosage and initial MeP concentration on MeP degradation were analyzed using response surface methodology (RSM) and Box–Behnken design (BBD). RESULTS The RSM model obtained from the present study (R2 > 0.99) showed a suitable correlation between the predicted values and experimental results of MeP degradation. Under optimized conditions (pH 6.5, SPS 5 mmol L−1, NM‐SCM 0.3 g L−1 and MeP 10 µmol L−1), a removal efficiency of 99.5% and a mineralization degree of 37% were achieved. The removal efficiency of MeP was reduced in the presence of inorganic ions as follows: chloride > nitrate > carbonate > phosphate. After five successive catalyst reuses, the degradation efficiency was >90%, indicating the excellent potential reusability of NM‐SCM catalyst. CONCLUSION Owing to the generation of highly reactive oxidizing species (SO4•−) and easy separation of the catalyst, the integration of NM‐SCM and SPS has great potential for the degradation of MeP from water and wastewater matrices. © 2019 Society of Chemical Industry

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“…Compounds such as eugenol, diphenylether and oligomers (calamenene) are generated avoiding the 100% conversion. This may due to the low acidity presented by the catalysts compared to traditional acid catalysts used in the same reaction [22].…”

Section: Catalytic Activitymentioning

confidence: 99%

“…These characteristics make mechanochemical milling a very attractive nanocatalysts synthesis technique. In addition, the required synthesis time is much shorter than in other synthesis techniques such as hydrothermal treatment [22]. There are several examples that have demonstrated the great potential of these mechanochemically synthesized NP.…”

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confidence: 99%

Mechanochemical Preparation of Novel Polysaccharide-Supported Nb2O5 Catalysts

et al. 2019

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Polysaccharides extracted from natural sources can be used as starting material for the preparation of nanoparticle supported composites. A novel family of bio-nanocomposites was mechanochemically synthesized by using niobium oxide and enzymatically produced polysaccharides. The structural, textural and surface properties of nanomaterials, were determined by X-Ray diffraction (XRD), nitrogen adsorption-desorption (N_2 porosimetry), pulse chromatography, infrared spectroscopy (ATR-IR) and dynamic light scattering (DLS). Selective oxidation of isoeugenol to vanillin was carried out to demonstrate the catalytic activity of the Nb-polysaccharides nanocomposites. Interestingly, most of our material showed high conversion of isoeugenol (60-70%) with selectivity to vanillin over 40%. The optimum conversion and selectivity were achieved with a reaction time between 8 and 24 h.Catalysts 2019, 9, 38 2 of 12 activity and selectivity of the catalysts [3,[6][7][8]. Heterogeneous catalysis can therefore be considered a key and priority activity for a Sustainable Chemistry [9].On the other hand, nanotechnology has generated a great scientific interest since allows discovering a multitude of new materials. But also evaluating already known materials from a new point of view. This is the case of metallic nanoparticles. They have been known since antiquity and from which, as early as 1857, Faraday [10] performed a first systematic study, based on the synthesis and properties of colloidal suspensions in catalysis [11]. However, it has been in recent years that most progress has been made in this regard.Nanoparticles (NP) have been studied in recent years due to their high activity, interaction specificity and interesting properties compared to metals (high surface/volume ratio combined with their small sizes) [12][13][14]. The specific properties of NP are directly related to their morphology and size, the dispersion of the metal or metal oxide on the support, the metal loading and the electronic properties of the NP in the material. In addition, NP have the additional advantage of their recyclability and reuse. These are essential and desired properties in many applications of these nanomaterials in catalysis [12,15], sensors [15,16] and even in the field of medicine [12]. There are several methods for the preparation of NP. Some of them include conventional physic-chemical methodologies of impregnation/reduction and coprecipitation [13,15,17], precipitation/deposition [13,15,17,18]. Nowadays more innovating methods have appeared such as photochemical deposition [13,15,17], ultrasonic deposition [13,15,17,18], use of laser treatment [13,15,17], supercritical fluids [13,15,17,19], plasma [13,15,17] or microwave irradiation [13,15,17,20,21].The mechanochemistry is a novel procedure for the production of NP. It consists on the melting, deformation and fracture of a mixture of reactants, normally solid, in a repetitive way during grinding. This reaction takes place at the interface of nanosized particles, those which are being continu...

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Continuous‐Flow Synthesis of Supported Magnetic Iron Oxide Nanoparticles for Efficient Isoeugenol Conversion into Vanillin

Cited by 41 publications

References 39 publications

Mechanochemically Synthesized Supported Magnetic Fe-Nanoparticles as Catalysts for Efficient Vanillin Production

Mechanochemically Synthesized Supported Magnetic Fe-Nanoparticles as Catalysts for Efficient Vanillin Production

Heterogeneous catalytic degradation of methylparaben using persulfate activated by natural magnetite; optimization and modeling by response surface methodology

Mechanochemical Preparation of Novel Polysaccharide-Supported Nb2O5 Catalysts

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