Agglomeration, colloidal stability, and magnetic separation of magnetic nanoparticles: collective influences on environmental engineering applications

Yeap, Swee Pin; Lim, JitKang; Ooi, Boon Seng; Ahmad, Abdul Latif

doi:10.1007/s11051-017-4065-6

Cited by 91 publications

(51 citation statements)

References 64 publications

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“…Nevertheless, negatively charged G-FeONPs showed lowest removal efficiency in the absence of H2O2 after comparing to other positively charged decolourizing agents. This case was dominated by reduction in surface area available for adsorption process after the agglomeration of G-FeONPs as showed in Figure 7 [28]. Even though, the larger size agglomerated G-FeONPs are normally heavier than individual NPs and hence more susceptible to gravitational pulling [28].…”

Section: Methylene Blue Dye Degradationmentioning

confidence: 99%

“…This case was dominated by reduction in surface area available for adsorption process after the agglomeration of G-FeONPs as showed in Figure 7 [28]. Even though, the larger size agglomerated G-FeONPs are normally heavier than individual NPs and hence more susceptible to gravitational pulling [28]. Following this, the gravitational sedimentation phenomena can help to separate the agglomerated G-FeONPs from the solution in an easier and cheaper way without the application of low gradient magnetic separation after dye degradation tests.…”

Section: Methylene Blue Dye Degradationmentioning

confidence: 99%

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Plantain Peel Mediated Green Synthesis Iron Oxide Nanoparticles, Surface Functionalization, and Them Performance towards Methylene Blue and Methyl Orange Dye Removal

Tan¹,

Ng²,

Lim³

et al. 2018

IJET

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Currently, green synthesis approach is used as the biocompatible, eco-friendly, and sustainable alternative of conventional approaches to synthesize iron oxide nanoparticles. In this work, magnetic iron oxide nanoparticles were synthesized by using plantain peel extract via green and biogenic approach. The surface of green synthesized iron oxide nanoparticles was functionalized to increase the stability of the nanoparticles and maintain the coexisting of both magnetic and catalytic property of the nanoparticles at the same time. Two kinds of surface functionalization structures were synthesized in this study, included silica core-iron oxide shell nanoparticles and silica core-PDDA polymerized iron oxide shell nanoparticles. The main concern of this study is the performance of bare and surface functionalized green synthesized nanoparticles. Methylene blue and methyl orange dyes were used as the model of dye removal test to indicate the feasibility of the synthesized nanocomposites. In summary, surface functionalized nanocomposites achieved higher dye removal efficiency than bare green synthesized iron oxide nanoparticles in both the methylene blue and methyl orange degradation test. Methylene blue dye was removed in higher rate than methyl orange dye due to the presence of negatively charged iron oxide nanoparticles with both the adsorptive and catalytic properties. At last, the components present in plantain peel extract were confirmed by using Fourier Transform Infrared Spectroscopy.

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Section: Methylene Blue Dye Degradationmentioning

confidence: 99%

Section: Methylene Blue Dye Degradationmentioning

confidence: 99%

Plantain Peel Mediated Green Synthesis Iron Oxide Nanoparticles, Surface Functionalization, and Them Performance towards Methylene Blue and Methyl Orange Dye Removal

Tan¹,

Ng²,

Lim³

et al. 2018

IJET

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“…Other reported values of critical coagulation concentrations have been reported for materials of similar chemical structure. In [36,37] a CCC value for Hematite nanoparticles of about 65Mm (1495 mg Na/L) was reported at near neutral pH when NaCl was used as the sodium precursor salt. Compared with the obtained value of 30 mg/L, Fig.…”

Section: Kinetic Aggregation Studiesmentioning

confidence: 99%

“…Suspensions of particles in the absence of magnetic field and affected only by the gravitational one remains stable for several weeks (approximately 8) which shows greater stability regarding to unmodified MNPs which normally show agglomeration and precipitation after 2 weeks. This could have important implications for the transport behavior of pollutants in the natural environment because, due to the high reactivity of the nanoparticles, the contaminants could be incorporated into the nanoparticles through adsorption, co-precipitation and other geochemical processes [37,38]. Therefore, stable suspended MNPs could improve transport of contaminants.…”

Section: Kinetic Aggregation Studiesmentioning

confidence: 99%

Study of agglomeration and magnetic sedimentation of Glutathione@Fe3O4 nanoparticles in water medium

Bolívar

González

2018

DYNA

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The study of the efficiency of the magnetic separation of nanoparticles in environment is important for its implementation in the remediation of water bodies. In this work the sedimentation dynamics of Glutathione@MNPs were evaluated for water systems with addition of calcium, zinc and sodium ions in a concentration range of 0-40 mg/L in the presence and absence of a vertical magnetic field of 0.2 T. Also, critical coagulation concentrations (CCC) were determined based on the DLVO theory. Particles stability in the absence of metal ions higher than 8 weeks could be observed, whereas in the presence of these ions the stability was reduced to 8 weeks. Separation of the material from the aqueous phase higher than 90% was obtained both for the presence of ions and for the material after the addition of heavy metals such as Hg and Cr.Keywords: Glutathione; magnetic nanoparticles; aggregation kinetics; magnetic sedimentation.Estudio de aglomeración y sedimentación magnética de nanopartículas de Glutatión@Fe 3 O 4 en medio acuoso Resumen El estudio de la eficiencia de la separación magnética de nanopartículas del medio ambiente es importante para su implementación en la remediación de cuerpos de agua. En este trabajo se evaluó la dinámica de sedimentación de los Glutatión@MNPs en sistemas de agua con adición de iones de calcio, zinc y sodio en un rango de concentración de 0-40 mg/L en presencia y ausencia de un campo magnético vertical de 0,2 T. Las concentraciones críticas de coagulación (CCC) se determinaron basándose en la teoría de DLVO. Se observó estabilidad de la partícula mayor de 8 semanas en ausencia de iones metálicos, mientras que con la presencia de estos iones la estabilidad se redujo a 8 semanas. La separación del material de la fase acuosa superior al 90% se obtuvo tanto para la presencia de iones como para el material después de la adición de metales pesados tales como Hg y Cr.Palabras clave: Glutatión; nanopartículas magnéticas; cinética de agregación; sedimentación magnética.

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“…The operation of LGMS could be easily done. According to researchers [1,18], the operation can be done by placing a permanent magnet diametrically by the next of the sample unit. The synthesized nZVI was prepared in the vial and a magnetic bar was placed directly adjacent to the sample unit.…”

Section: Magnetic Behavior Of Synthesized Nzvimentioning

confidence: 99%

Performance of Mulberry Leaves Mediated Green Synthesis Zero-Valent Iron Nanoparticles in Dye Removal

Lim¹,

Ng²,

Lim³

et al. 2018

IJET

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The nanomaterials especially be made of iron, are tapering off the environmental pollution in a sufficiently great way which is worthy for attention. Green synthesis of iron nanoparticles through the extraction of the natural products or wastes has been developed in a way that is more sustainable than the chemical routes associated with several limitations. The mulberry leaves, which are easy available in nature, were chosen for plant-mediated green synthesis of zero-valent iron nanoparticles (nZVI). The characterization of the synthesized nanoparticles was performed with the used of dynamic light scattering (DLS), scanning electron microscope (SEM), and Fourier Transform Infrared Spectroscopy (FTIR). The polyphenols content of the mulberry leaf can be used to synthesize the iron nanoparticles. The iron nanoparticles can be used as the Fenton-like catalyst to enhance the efficiency of dyes degradation. Meanwhile, the iron nanoparticles can be removed by its magnetic properties after the degradation of pollutants which can be reused in subsequent environmental remediation. The efficiency of dyes degradation by the synthesized iron nanoparticles, was investigated by UV-visible spectroscopy (UV-vis). The cationic and anionic model dyes were used to investigate the ability of the synthesized iron nanoparticles in degradation of dye molecules. Methylene Blue was used as the model for cationic dye whereas Methyl Orange was chosen as anionic model dye. The percentage removal of respective dyes was investigated at the different period of time. The work investigated the magnetic and catalytic bifunctionalities of the synthesized iron nanoparticles.

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Agglomeration, colloidal stability, and magnetic separation of magnetic nanoparticles: collective influences on environmental engineering applications

Cited by 91 publications

References 64 publications

Plantain Peel Mediated Green Synthesis Iron Oxide Nanoparticles, Surface Functionalization, and Them Performance towards Methylene Blue and Methyl Orange Dye Removal

Plantain Peel Mediated Green Synthesis Iron Oxide Nanoparticles, Surface Functionalization, and Them Performance towards Methylene Blue and Methyl Orange Dye Removal

Study of agglomeration and magnetic sedimentation of Glutathione@Fe3O4 nanoparticles in water medium

Performance of Mulberry Leaves Mediated Green Synthesis Zero-Valent Iron Nanoparticles in Dye Removal

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