Modified Composite Based on Magnetite and Polyvinyl Alcohol: Synthesis, Characterization, and Degradation Studies of the Methyl Orange Dye from Synthetic Wastewater

Modrogan, Cristina; Căprărescu, Simona; Dăncilă, Annette Madelene; Orbuleţ, Oanamari Daniela; Grumezescu, Alexandru Mihai; Purcar, Violeta; Rădiţoiu, Valentin; Fierăscu, Radu Claudiu

doi:10.3390/polym13223911

Cited by 30 publications

(23 citation statements)

References 34 publications

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“…So, at pH < pH pzc , the surface of the catalyst is positive and is suitable to form adsorption–desorption equilibrium with a maximum number of anionic MO molecules and thus mineralize it in the presence of light utilizing photogenerated • OH or • O 2 − radicals. However, at pH > pH pzc , the surface of the catalyst is negative, which will reflect the anionic MO molecules and thus a lesser number of dye molecules will be available for degradation; this is why a decrease in photocatalytic efficiency appeared at higher pH values [ 41 ]. The outcomes suggested that the Ni 1−x Mn x WO 4 NC possessed better photocatalytic efficiency as compared with pristine NiWO 4 .…”

Section: Resultsmentioning

confidence: 99%

In Situ Hydrothermal Synthesis of Ni1−xMnxWO4 Nanoheterostructure for Enhanced Photodegradation of Methyl Orange

et al. 2023

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The monoclinic nanocrystalline Ni1−xMnxWO4 heterostructure has been successfully synthesized by the hydrothermal technique for achieving better sensitive and photocatalytic performances. Different characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV–Vis), and photoluminescence (PL) spectroscopy have been employed to investigate their structural, microstructural, and optical properties. Mn-ion incorporation in the NiWO4 lattice reduces the particle size of the sample compared with the pure undoped NiWO4 sample, which has been confirmed from the transmission electron microscope image. The Tauc plot of the Ni1−xMnxWO4 sample exhibits a significant decrease in bandgap energy compared with the pure undoped NiWO4 sample due to the quantum confinement effect. Finally, the material was explored as a photocatalyst for the degradation of methyl orange (MO) dye from wastewater under visible light irradiation. Various reaction parameters such as pH, catalyst dose, reaction time, and kinetics of the photodegradation were studied using the batch method. The results showed that the Ni1−xMnxWO4 is highly efficient (94.51%) compared with undoped NiWO4 (65.45%). The rate of photodegradation by Ni1–xMnxWO4 (0.067) was found to be 1.06 times higher than the undoped NiWO4 (0.062).

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Section: Resultsmentioning

confidence: 99%

In Situ Hydrothermal Synthesis of Ni1−xMnxWO4 Nanoheterostructure for Enhanced Photodegradation of Methyl Orange

et al. 2023

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“…X‐ray diffractograms for PVA and the organogels displayed three distinctive peaks at 2 θ values (Figure 4a–c) of 19.5° with high intensity peak, 22.7° with a low intensity shoulder peak and 40.7° with a low intensity broad peak along with an interatomic spacing unit of 4.5, 3.9, and 2.2 Å corresponding to planes (1 0 1), (2 0 0), and (1 0 2) of pristine PVA 44 . However, the base intensity of 19.5° and 40.7° with a reflection of (1 0 1, 1 0 2) seem to diminish, obtaining broad peaks with the increase in grafting of stearic acid to PVA surface.…”

Section: Resultsmentioning

confidence: 99%

Removal of organic solvents from contaminated water surface through a fatty acid grafted polyvinyl alcohol based organogel

Baruah

Ahmed

Dutta

et al. 2022

J of Applied Polymer Sci

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Toxic organic solvents are constantly being cast out causing serious issues to the environment. In this work, a polyvinyl alcohol (PVA)‐based organogel has been prepared by modification with a long‐chain fatty acid via condensation method without the use of any cross‐linker. Organogel or the semi‐solid material has been used as a sorbent for solvent absorption from the polluted water surface. The prepared organogel was characterized by Fourier Transform‐Infrared Spectroscopy, Nuclear Magnetic Resonance, Wide‐Angle X‐Ray diffraction, scanning electron microscope, Thermogravimetric Analysis while contact angle measurements were also performed. The gel was used as a sorbent for the absorption of organic solvents. The swelling ratio was examined and exhibited absorption performance of 534% with reusable and retention properties. Experiments were performed to find the maximum absorption capacity at 875.5 (g/g), establishing kinetics of second order reaction. The gel can be extracted by scooping after absorption. Thus, making it an effective and ideal material for the removal of a wide array of organic solvents.

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“…FT-IR spectroscopy allowed the verification of the presence of specific functional groups in the structure of the developed materials. The absorption band at approximately 520 cm −1 corresponded to the tensile vibrations of Fe-O bonds derived from the magnetic core based on Fe3O4 nanoparticles [27]. Moreover, a number of absorption bands that probably came from the chemical bonds present in the structure of the compounds in the stabilizing agent used, i.e., Arabic gum, could be observed in the FT-IR spectrum.…”

Section: Characterization Of the Chemical Structure Of The Particles ...mentioning

confidence: 98%

Iron Oxide Magnetic Nanoparticles with a Shell Made from Nanosilver—Synthesis Methodology and Characterization of Physicochemical and Biological Properties

et al. 2022

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The interest in magnetic nanoparticles is constantly growing, which is due to their unique properties, of which the most useful is the possibility of directing their movement via an external magnetic field. Thus, applications may be found for them as carriers in targeted drug delivery. These nanomaterials usually form a core in a core–shell structure, and a shell may be formed via various compounds. Here, nanosilver-shelled iron oxide magnetic nanoparticles were developed. Various reaction media and various Arabic gum (stabilizer) solution concentrations were investigated to verify those that were most beneficial one in limiting their agglomeration as much as possible. The essential oil of lavender was proposed as a component of such a medium; it was used alone or in combination with distilled water as a solvent of the stabilizer. The particle size was characterized by dynamic light scattering (DLS), the chemical structure was characterized via FT-IR spectroscopy, the crystallinity was characterized by X-ray diffraction (XRD), and the surface morphology and elemental composition were verified via the SEM-EDS technique. Moreover, UV-Vis spectrophotometry was used to verify the presence of the shell made of nanosilver. Importantly, the particles’ pro-inflammatory activity and cytotoxicity towards L929 murine fibroblasts were also characterized. It was demonstrated that a 3% stabilizer solution provided a preparation of Fe3O4@Ag particles, but its stabilizing effect was not sufficient, as a suspension with micrometric particles was obtained; thus it was necessary to apply 4 h of sonication for their crushing. Next, the oil/water reaction medium was verified as beneficial in terms of nanoparticle formation. In such reaction conditions, the formation of particle agglomerates was strongly limited, and after 15 min of sonication a suspension containing only nanoparticles was obtained. The presence of a nanosilver shell was confirmed spectrophotometrically via XRD and SEM-EDS techniques. Importantly, the developed nanomaterials showed no cytotoxicity towards murine fibroblasts and no pro-inflammatory activity.

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Modified Composite Based on Magnetite and Polyvinyl Alcohol: Synthesis, Characterization, and Degradation Studies of the Methyl Orange Dye from Synthetic Wastewater

Cited by 30 publications

References 34 publications

In Situ Hydrothermal Synthesis of Ni1−xMnxWO4 Nanoheterostructure for Enhanced Photodegradation of Methyl Orange

In Situ Hydrothermal Synthesis of Ni1−xMnxWO4 Nanoheterostructure for Enhanced Photodegradation of Methyl Orange

Removal of organic solvents from contaminated water surface through a fatty acid grafted polyvinyl alcohol based organogel

Iron Oxide Magnetic Nanoparticles with a Shell Made from Nanosilver—Synthesis Methodology and Characterization of Physicochemical and Biological Properties

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