Green Fenton-like magnetic nanocatalysts: Synthesis, characterization and catalytic application

Nădejde, Claudia; Neamţu, Mariana; Hodoroabă, Vasile-Dan; Schneider, R.; Paul, Andrea; Ababei, G.; Panne, Ulrich

doi:10.1016/j.apcatb.2015.04.050

Cited by 37 publications

(13 citation statements)

References 54 publications

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“…Therefore, the 1.0 g L −1 catalyst concentration was maintained in the following experiments. These results suggest that a molecular oxygen activation process may occur in solution generating Reactive Oxygen Species (ROSs) in the presence of iron and further triggering the BPA oxidation and break-down over the catalysts in the absence of hydrogen peroxide and/or UV irradiation 38 , 52 , 53 . Similar results were reported by Xu and Wang (2012) 49 when using the same concentrations of uncoated MNPs for the degradation of 2,4-dichlorophenol.…”

Section: Resultsmentioning

confidence: 98%

“…Magnetite (Fe 3 O 4 ) is commonly used in the composition of Fenton-like heterogeneous catalysts 17 , 22 , 26 – 30 , 32 – 34 , 38 – 41 . One strategy for the preparation of magnetically recoverable catalysts is the immobilization of metal ions onto MNPs by modifying their surface with organic molecules (ligands) such as eco-friendly polymers 27 , 42 .…”

Section: Introductionmentioning

confidence: 99%

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Functionalized magnetic nanoparticles: Synthesis, characterization, catalytic application and assessment of toxicity

Neamţu

Nădejde

Hodoroabă

et al. 2018

Sci Rep

Self Cite

110

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Cost-effective water cleaning approaches using improved treatment technologies, for instance based on catalytic processes with high activity catalysts, are urgently needed. The aim of our study was to synthesize efficient Fenton-like photo-catalysts for rapid degradation of persistent organic micropollutants in aqueous medium. Iron-based nanomaterials were chemically synthesized through simple procedures by immobilization of either iron(II) oxalate (FeO) or iron(III) citrate (FeC) on magnetite (M) nanoparticles stabilized with polyethylene glycol (PEG). Various investigation techniques were performed in order to characterize the freshly prepared catalysts. By applying advanced oxidation processes, the effect of catalyst dosage, hydrogen peroxide concentration and UV-A light exposure were examined for Bisphenol A (BPA) conversion, at laboratory scale, in mild conditions. The obtained results revealed that BPA degradation was rapidly enhanced in the presence of low-concentration H2O2, as well as under UV-A light, and is highly dependent on the surface characteristics of the catalyst. Complete photo-degradation of BPA was achieved over the M/PEG/FeO catalyst in less than 15 minutes. Based on the catalytic performance, a hierarchy of the tested catalysts was established: M/PEG/FeO > M/PEG/FeC > M/PEG. The results of cytotoxicity assay using MCF-7 cells indicated that the aqueous samples after treatment are less cytotoxic.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Functionalized magnetic nanoparticles: Synthesis, characterization, catalytic application and assessment of toxicity

Neamţu

Nădejde

Hodoroabă

et al. 2018

Sci Rep

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110

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“…120 It should be noted that most chemical oxidation studies investigated synthetic magnetites rather than natural minerals (Table 12) In this context, it is challenging to develop iron catalysts offering greater stability and lower iron leaching but without compromising the oxidation efficiency. Therefore, various supports or stabilizers have been used to anchor iron on the surface of catalysts to improve the stability of magnetite even after several oxidation cycles including CeO2, 528 hydrogel, 529 iron oxalate, 530 MWCNTs, [531][532][533] mesoporous SiO2, 534 and rGO. 535 Many researchers have tested metal doping for isomorphic substitution of Fe in magnetite structure to improve its stability.…”

Section: Type Of Interaction With Green Rustmentioning

confidence: 99%

Magnetite and Green Rust: Synthesis, Properties, and Environmental Applications of Mixed-Valent Iron Minerals

et al. 2018

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Mixed-valent iron [Fe(II)-Fe(III)] minerals such as magnetite and green rust have received a significant amount of attention over recent decades, especially in the environmental sciences. These mineral phases are intrinsic and essential parts of biogeochemical cycling of metals and organic carbon and play an important role regarding the mobility, toxicity, and redox transformation of organic and inorganic pollutants. The formation pathways, mineral properties, and applications of magnetite and green rust are currently active areas of research in geochemistry, environmental mineralogy, geomicrobiology, material sciences, environmental engineering, and environmental remediation. These aspects ultimately dictate the reactivity of magnetite and green rust in the environment, which has important consequences for the application of these mineral phases, for example in remediation strategies. In this review we discuss the properties, occurrence, formation by biotic as well as abiotic pathways, characterization techniques, and environmental applications of magnetite and green rust in the environment. The aim is to present a detailed overview of the key aspects related to these mineral phases which can be used as an important resource for researchers working in a diverse range of fields dealing with mixed-valent iron minerals.

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“…The proposed mechanism could be as follows: the BPA oxidation and degradation is triggered by the Reactive Oxygen Species (ROSs) generated by a molecular oxygen activation process which occurred in the presence of photosensitizer under the UV irradiation 5,35,[37][38][39][40][41] . Detailing, a photon is adsorbed by an electronically excited singlet state which can further undergo intersystem crossing and generate longer lived excited triplet state, promoting a sensitizer.…”

Section: Kinetics Of Bpa Photodegradation and Cytotoxicity Of The Sammentioning

confidence: 99%

Iron phthalocyanine-sensitized magnetic catalysts for BPA photodegradation

Neamţu

Nădejde

Brinza

et al. 2020

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the catalytic behavior of iron phthalocyanine (fepc)-sensitized magnetic nanocatalysts was evaluated for their application in the oxidative treatment of Bisphenol A (BpA) under mild environmental conditions. two types of fepc (fe(ii)pc and fe(iii)pc), which are highly photosensitive compounds, were immobilized on the surface of functionalized magnetite. the nanomaterials were characterized by high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (ftiR) and thermogravimetric analyses (tGA). the generation of singlet oxygen by nanomaterials was also investigated. In the presence of UVA light exposure (365 nm) and 15 mM H 2 o 2 , the M@Fe(III)Pc photocatalyst gave the best results; for a catalyst concentration of 2.0 g L − 1 , around 60% BPA was removed after 120 min of reaction. These experimental conditions were further tested under natural solar light exposure, for which also M@fe(iii)pc exhibited enhanced oxidative catalytic activity, being able to remove 83% of BPA in solution. The water samples were less cytotoxic after treatment, this being confirmed by the MCF-7 cell viability assay. Emerging recalcitrant organic pollutants received extensive attention over the years, since they are difficult to remove using conventional technologies. Continuous efforts are made to find improved solutions for fighting against and for diminishing environmental pollution. Endocrine disruptive chemicals (EDC) are a class of hazardous persistent pollutants exhibiting numerous harmful effects, able to induce subtle and irreversible changes in living organisms, even in concentrations of few parts per billion 1,2. Bisphenol A (BPA) is an EDC that remains a major water contaminant, since its production in the 1950s. Since then, BPA become a well-established model compound for persistent micropollutants. Although found in low concentration in water, its removal proved to be unsuccessful using conventional water treatment approaches, such as chlorination and ozonation, processes that also exhibit several drawbacks 3. Promising alternatives, such as photocatalysis 1,4-6 , were found to be very efficient and versatile. For instance, photocatalysis involving dye-sensitization represents an eco-friendly approach with great potential for very efficient removal of persistent hazardous pollutants from waters. Singlet oxygen, a reactive oxygen species (ROS), has proved to be an extremely effective agent in the oxidation of emerging pollutants, due to its high oxidation ability. Organic phthalocyanines (Pcs) are the synthetic analogues of natural porphyrine compounds 7. Discovered in 1928, Pcs, possessing a two-dimensional geometry and a ring system consisting of 18 π-electrons, are composed of four isindole units linked by nitrogen atoms. Due to the large, aromatic, macrocyclic structure of Pc, a variety of metals (Me), such as Fe 8-10 , Zn 11,12 , Cu 13,14 , Mn, Co, Ni 15,16 , Si 17 , Ru 18 , can be bonded inside the cycle of Pc, substituting the two hydrogen atoms. These ...

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Green Fenton-like magnetic nanocatalysts: Synthesis, characterization and catalytic application

Cited by 37 publications

References 54 publications

Functionalized magnetic nanoparticles: Synthesis, characterization, catalytic application and assessment of toxicity

Functionalized magnetic nanoparticles: Synthesis, characterization, catalytic application and assessment of toxicity

Magnetite and Green Rust: Synthesis, Properties, and Environmental Applications of Mixed-Valent Iron Minerals

Iron phthalocyanine-sensitized magnetic catalysts for BPA photodegradation

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