Precipitation synthesis and magnetic properties of self-assembled magnetite-chitosan nanostructures

Bezdorozhev, Oleksii; Kolodiazhnyi, Taras; Vasylkiv, Oleg

doi:10.1016/j.jmmm.2016.12.048

Cited by 24 publications

(13 citation statements)

References 47 publications

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“…Characterisation results for the synthesized magnetite revealed the presence of peaks at 21, 24, 35, 40, 50, 61, 63, 69, and 74 theta degrees. As such, the results obtained in this study are in agreement with the existing literature (Tipsawat et al, 2018, Bezdorozhev et al, 2017, Tahar et al, 2018. Moreover, quantitative results revealed that there was no presence of other peaks in magnetite's diffraction pattern, which, if existed, could suggest the existence of other impurities in the matrices of the synthesized mineral.…”

Section: Magnetitesupporting

confidence: 91%

Beneficiation of acid mine drainage (AMD): A viable option for the synthesis of goethite, hematite, magnetite, and gypsum – Gearing towards a circular economy concept

Akinwekomi

Maree²,

Masindi

et al. 2020

Minerals Engineering

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Pollution of water resources by acid mine drainage (AMD) has been an issue of primary concern in recent decades, since it negatively affects the environment and its suitability to foster life. As such, efforts to recover, valorise and beneficiate minerals acquired from AMD treatment process have been ongoing, albeit with minimal success. With that in mind, this study unpacks novel ways of beneficiating AMD via the synthesis of valuable minerals with myriads of industrial applications. To this end, real AMD was used to synthesize goethite, hematite, magnetite, and gypsum (product minerals). Drinking water was also reclaimed as part of the treatment process, hence rendering this system a zero-liquid-discharge (ZLD) process. For the synthesis of goethite, hematite, and magnetite, Fe(III) and Fe(II) were recovered via sequential precipitation in batch reactors. Lime was added to treated water to synthesize high-grade gypsum. Furthermore, reverse osmosis (RO) was employed to reclaim drinking water as per South African drinking water standards (SANS 241) specifications. Product minerals were ascertained using advanced analytical techniques. Concisely, this study proved that AMD can be beneficiated into valuable minerals, which could be utilized in a number of industrial applications. The profits from selling the product minerals can potentially aid in offsetting the running costs of the treatment process, hence making this

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Section: Magnetitesupporting

confidence: 91%

Beneficiation of acid mine drainage (AMD): A viable option for the synthesis of goethite, hematite, magnetite, and gypsum – Gearing towards a circular economy concept

Akinwekomi

Maree²,

Masindi

et al. 2020

Minerals Engineering

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“…At the temperature of 300 K magnetization curves of both samples show an insignificant coercive field value and remnant magnetization (Table 4), which is characteristic for the superparamagnetic behavior [29]. The obtained Mr/Ms values of 0.147 and 0.140 for mPGMT and mPGMT-deta, respectively, are in the range from 0.1 to 0.5, which indicates that the samples exhibit almost uniform magnetization [30].…”

Section: Magnetic Propertiesmentioning

confidence: 90%

“…PGMT 249 295 346 510 270 13 354 65 473 20 1 mPGMT 294 335 358 505 277 4 357 68 469 18 9 mPGMT-deta 237 295 417 554 253 4 343 28 440 51 8 Incorporation of magnetite increased the thermal stability of mPGMT in comparison to PGMT since the observed initial decomposition temperatures (T0) for these samples are 210 and 192 o C, respectively. Magnetite retarded thermal degradation via its strong interactions with the copolymer chains [30]. Almost full decomposition was observed for the PGMT sample since the residue is about 1 wt.%.…”

Section: Tg Analysismentioning

confidence: 96%

Characterization of glycidyl methacrylate based magnetic nanocomposites

Marković¹,

Spasojević²,

Dapčević³

et al. 2019

Hem Ind

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Magnetic and non-magnetic macroporous crosslinked copolymers of glycidyl methacrylate and trimethylolpropane trimethacrylate were prepared by suspension copolymerization and functionalized with diethylenetriamine. The samples were characterized by mercury porosimetry, scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy analysis (FTIR-ATR), thermogravimetric analysis (TGA), X-ray diffractometry (XRD), atomic force microscopy (AFM), transmission electron microscopy (TEM) and SQUID magnetometry. The FTIR-ATR analysis of synthesized magnetic nanocomposites confirmed the presence of magnetite and successful aminofunctionalization. Non-functionalized and amino-functionalized nanocomposites exhibited superparamagnetic behavior at 300 K, with a saturation magnetization of 5.0 emu/g and 2.9 emu/g, respectively. TEM analysis of the magnetic nanocomposite has shown that magnetic nanoparticles were homogeneously dispersed in the polymer matrix. It was demonstrated that incorporation of magnetic nanoparticles enhanced the thermal stability of the magnetic nanocomposite in comparison to the initial non-magnetic macroporous copolymer.

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“…La síntesis de un composito de magnetita/quitosano dependiendo de los parámetros de reacción, la morfología de las nanopartículas obtenidas varía desde esféricas, forma de semilla de arroz hasta forma de grumos, todo esto usando cloruro de hierro como precursor y urea como agente precipitante. El tiempo de reacción es el que determinó la morfología, pues en 10 hr de reacción se obtuvieron nanopartículas esféricas, mientras que en 50 hr de reacción generaron nanopartículas con forma de semilla de arroz [32]. Se ha estudiado por otra parte en el campo ambiental para eliminación fotocatalítica de compuestos orgánicos como nitrobenceno [33] e isatina [25].…”

Section: Magnetita (Fe3o4)unclassified

Methods of Synthesis of Oxides of Iron and Removing Compounds Arsenic in Water

Medina

Silva

Rodriguez

2021

espoch

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Environmental pollution by heavy metals has been extensively researched using different materials and techniques but, this problem has not been fully resolved. High adsorption capacity of iron oxides such as hematite, magnetite, goethite and, ferrihydrite to remove arsenic are described in this review. There are many international investigations about the minerals of iron oxides and they describe the composition, properties, synthesis methods and involved variables. Active carbon, silicones and polymers had been used to obtain composites with iron oxides and they have gave better results to remove different anions and cations. The aim in this paper is to introduce studies already carried out and encourage research in this topic to take advantage of the particular characteristics of iron oxides and use them in the environmental remediation. In addition, it is important to introduce the natural iron oxides availability that have a lot of field to study. The literature search on the subject was carried out in Science Direct and high impact articles related to natural or synthetic oxides were used. Keywords: Arsenic, hematite, magnetite, goethite, iron composites. Resumen La contaminación ambiental por metales se ha estudiado mucho con diferentes materiales y técnicas, pero aún no se ha logrado resolver por completo este problema. La alta capacidad de adsorción de los óxidos de hierro como la hematita, magnetita, goetita, ferrihidrita, para la remoción de arsénico en agua son descritos en este trabajo de revisión. Existen muchas investigaciones internacionales de los óxidos de hierro en las que se expone la composición de estos minerales, las propiedades, métodos de síntesis y las variables que intervienen. El carbón activo, las siliconas y los polímeros son materiales que se han usado para formar compositos con estos óxidos que han contribuido a obtener mejores resultados en la remoción de diferentes aniones y cationes. Con este trabajo se pretende difundir estudios ya realizados e incentivar la investigación en este campo para aprovechar las características particulares de los óxidos de hierro y usarlos como remediadores ambientales. Ademas, es importante dar a conocer la existencia de óxidos de hierro naturales que dejan mucho campo por estudiar.

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Precipitation synthesis and magnetic properties of self-assembled magnetite-chitosan nanostructures

Cited by 24 publications

References 47 publications

Beneficiation of acid mine drainage (AMD): A viable option for the synthesis of goethite, hematite, magnetite, and gypsum – Gearing towards a circular economy concept

Beneficiation of acid mine drainage (AMD): A viable option for the synthesis of goethite, hematite, magnetite, and gypsum – Gearing towards a circular economy concept

Characterization of glycidyl methacrylate based magnetic nanocomposites

Methods of Synthesis of Oxides of Iron and Removing Compounds Arsenic in Water

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