A review on nanotechnological application of magnetic iron oxides for heavy metal removal

Bhateria, Rachna; Singh, Rimmy

doi:10.1016/j.jwpe.2019.100845

Cited by 196 publications

(75 citation statements)

References 124 publications

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“…Among these, magnetic iron oxide nanoparticles emerged not only for their good adsorption properties, but also for the possibility of easy removal from aqueous systems [3]. Iron oxide magnetic nanoparticles (MNPs), indeed, were shown to have large surface areas with many active sites for adsorption of metal ions, good selectivity and low toxicity [4][5][6][7]. However, due to their hydrophobic surfaces, aggregation occurs in aqueous media, which lowers the efficiency of adsorption [8].…”

Section: Introductionmentioning

confidence: 99%

“…In this area, silica-based materials are hydrophilic and also considered as excellent adsorbents, being biocompatible, chemically and physically stable and cheap [11], so the combination of the two materials is considered a winning strategy for obtaining the best absorbents. Moreover, silica coating due to the abundant presence of hydroxyl groups facilitates the functionalization of the shell [7]. A thorough bibliographic search showed that great efforts have already been carried out to obtain MNPs@SiO 2 /R nanocomposites, where R is usually an organic or hybrid organic-silica coating offering N or O-donor sites to coordinate the heavy metal center.…”

Section: Introductionmentioning

confidence: 99%

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Silica-Coated Magnetic Nanocomposites for Pb2+ Removal from Aqueous Solution

et al. 2020

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Magnetic iron oxide-silica shell nanocomposites with different iron oxide/silica ratio were synthesized and structurally characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), small-angle neutron scattering, magnetic and N 2 -sorption studies. The composite that resulted with the best properties in terms of contact surface area and saturation of magnetization was selected for Pb 2+ adsorption studies from aqueous media. The material presented good absorption capacity (maximum adsorption capacity 14.9 mg·g −1 ) comparable with similar materials presented in literature. Its chemico-physical stability and adsorption capacity recommend the nanocomposite as a cheap adsorbent material for lead.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Silica-Coated Magnetic Nanocomposites for Pb2+ Removal from Aqueous Solution

et al. 2020

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“…Subsequently, a chemical treatment that will disable the surfactant will lead to the development of an extended network of linked particles throughout the solution, which will form the gel. The evaporation of the solvent will lead to the obtaining of MNPs [ 73 ]. While the sol-gel method is advantageous owing to its low cost, and the good homogeneity and high purity of the so-obtained nanoparticles, further heat treatments are required to reach a final crystalline state [ 69 ].…”

Section: Magnetite Nanoparticles—synthesis Properties and Functimentioning

confidence: 99%

Magnetite Nanoparticles and Essential Oils Systems for Advanced Antibacterial Therapies

Mihai

Chircov

Grumezescu

et al. 2020

IJMS

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Essential oils (EOs) have attracted considerable interest in the past few years, with increasing evidence of their antibacterial, antiviral, antifungal, and insecticidal effects. However, as they are highly volatile, the administration of EOs to achieve the desired effects is challenging. Therefore, nanotechnology-based strategies for developing nanoscaled carriers for their efficient delivery might offer potential solutions. Owing to their biocompatibility, biodegradability, low toxicity, ability to target a tissue specifically, and primary structures that allow for the attachment of various therapeutics, magnetite nanoparticles (MNPs) are an example of such nanocarriers that could be used for the efficient delivery of EOs for antimicrobial therapies. The aim of this paper is to provide an overview of the use of EOs as antibacterial agents when coupled with magnetite nanoparticles (NPs), emphasizing the synthesis, properties and functionalization of such NPs to enhance their efficiency. In this manner, systems comprising EOs and MNPs could offer potential solutions that could overcome the challenges associated with biofilm formation on prosthetic devices and antibiotic-resistant bacteria by ensuring a controlled and sustained release of the antibacterial agents.

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“…Along with the development of nanotechnologies, nanosized magnetite has increasingly been produced and studied for applications in various fields from medicine [ 1 ] to environmental remediation [ 2 ]. For example, Fe 3 O 4 nanoparticles (NPs), due to their small size, high surface-area-to-volume ratio, the possibility for surface modification and excellent magnetic proper, ties have potential in wastewater treatment as magnetically removable low-cost sorbent carriers for phosphorus [ 3 ], heavy metals [ 4 ] or photocatalytic particles [ 5 , 6 ]. However, the widespread use of iron oxide nanomaterials will inevitably lead to increased environmental emissions.…”

Section: Introductionmentioning

confidence: 99%

“…HS is divided into three fractions: humic acids, fulvic acids, and humin and can undergo a number of reactions with Fe, e.g., form complexes with both Fe(II) and Fe(III) via carboxyl groups of the organic matter [ 6 ]. Also, HS can (i) sorb to iron oxide particles [ 4 ] changing their surface charge and affecting their aggregation and bioavailability [ 16 ]; (ii) interfere with mineral dissolution/precipitation reactions [ 17 ]; and (iii) drive redox reactions [ 18 ]. The adsorption of HS to the surface of engineered NPs may strongly influence, and in some cases control, their surface properties and aggregation behavior.…”

Section: Introductionmentioning

confidence: 99%

Effects of Humic Acids on the Ecotoxicity of Fe3O4 Nanoparticles and Fe-Ions: Impact of Oxidation and Aging

et al. 2020

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The magnetite nanoparticles (MNPs) are increasingly produced and studied for various environmental applications, yet the information on their ecotoxicity is scarce. We evaluated the ecotoxicity of MNPs (~7 nm) before and after the addition of humic acids (HAs). White mustard Sinapis alba and unicellular ciliates Paramecium caudatum were used as test species. The MNPs were modified by HAs and oxidized/aged under mild and harsh conditions. Bare MNPs proved not toxic to plants (96 h EC50 > 3300 mg/L) but the addition of HAs and mild oxidation increased their inhibitory effect, especially after harsh oxidation (96 h EC50 = 330 mg/L). Nevertheless, all these formulations could be ranked as ‘not harmful’ to S. alba (i.e., 96 h EC50 > 100 mg/L). The same tendency was observed for ciliates, but the respective EC50 values ranged from ‘harmful’ (24 h EC50 = 10–100 mg/L) to ‘very toxic’ (24h EC50 < 1 mg/L). The ecotoxicity of Fe-ions with and without the addition of HAs was evaluated in parallel: Fe (II) and Fe (III) ions were toxic to S. alba (96 h EC50 = 35 and 60 mg/L, respectively) and even more toxic to ciliates (24 h EC50 = 1 and 3 mg/L, respectively). Addition of the HAs to Fe-ions yielded the respective complexes not harmful to plants (96h EC50 > 100 mg/L) but toxic to ciliates (24h EC50 = 10–100 mg/L). These findings will be helpful for the understanding of the environmental fate and toxicity of iron-based NPs.

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A review on nanotechnological application of magnetic iron oxides for heavy metal removal

Cited by 196 publications

References 124 publications

Silica-Coated Magnetic Nanocomposites for Pb2+ Removal from Aqueous Solution

Silica-Coated Magnetic Nanocomposites for Pb2+ Removal from Aqueous Solution

Magnetite Nanoparticles and Essential Oils Systems for Advanced Antibacterial Therapies

Effects of Humic Acids on the Ecotoxicity of Fe3O4 Nanoparticles and Fe-Ions: Impact of Oxidation and Aging

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