scholarly journals Effect of the Surface Charge on the Adsorption Capacity of Chromium(VI) of Iron Oxide Magnetic Nanoparticles Prepared by Microwave-Assisted Synthesis

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2372 ◽  
Author(s):  
Alvaro Gallo-Cordova ◽  
María del Puerto Morales ◽  
Eva Mazarío
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Surface Charge ◽  
Solid Phase ◽  
Superparamagnetic Iron Oxide ◽  
Water Remediation ◽  
Microwave Assisted Synthesis ◽  
Surface Charges ◽  
Chromium Vi ◽  
Adsorption Capacities

Solid phase extraction using magnetic nanoparticles has represented a leap forward in terms of the improvement of water quality, preventing the contamination of industrial effluents from discharge in a more efficient and affordable way. In the present work, superparamagnetic iron oxide nanoparticles (MNP) with different surface charges are tested as nanosorbents for the removal of chromium(VI) in aqueous solution. Uniform magnetic nanoparticles (~12 nm) were synthesized by a microwave polyol-mediated method, and tetraethyl orthosilicate (TEOS) and (3-aminopropyl) triethoxysilane (APTES) were grafted onto their surface, providing a variation in the surface charge. The adsorptive process of chromium was evaluated as a function of the pH, the initial concentration of chromium and contact time. Kinetic studies were best described by a pseudo-second order model in all cases. TEOS@MNP barely removed the chromium from the media, while non-grafted particles and APTES@TEOS@MNP followed the Langmuir model, with maximum adsorption capacities of 15 and 35 mgCr/g, respectively. The chromium adsorption capacities abruptly increased when the surface became positively charged as the species coexisting at the experimental pH are negatively charged. Furthermore, these particles have proven to be highly efficient in water remediation due their 100% reusability after more than six consecutive adsorption/desorption cycles.

Evaluation of Surface-modified Superparamagnetic Iron Oxide Nanoparticles to Optimize Bacterial Immobilization for Bio-separation with the Least Inhibitory Effect on Microorganism Activity

2020 ◽  
Vol 10 (2) ◽  
pp. 166-174
Author(s):  
Mehdi Khoshneviszadeh ◽  
Sarah Zargarnezhad ◽  
Younes Ghasemi ◽  
Ahmad Gholami
Keyword(s):  
Iron Oxide ◽  
Amino Acid ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Surface Coating ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Surface Charges ◽  
Surface Modified

Background: Magnetic cell immobilization has been introduced as a novel, facile and highly efficient approach for cell separation. A stable attachment between bacterial cell wall with superparamagnetic iron oxide nanoparticles (SPIONs) would enable the microorganisms to be affected by an outer magnetic field. At high concentrations, SPIONs produce reactive oxygen species in cytoplasm, which induce apoptosis or necrosis in microorganisms. Choosing a proper surface coating could cover the defects and increase the efficiency. Methods: In this study, asparagine, APTES, lipo-amino acid and PEG surface modified SPIONs was synthesized by co-precipitation method and characterized by FTIR, TEM, VSM, XRD, DLS techniques. Then, their protective effects against four Gram-positive and Gram-negative bacterial strains including Enterococcus faecalis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were examined through microdilution broth and compared to naked SPION. Results: The evaluation of characterization results showed that functionalization of magnetic nanoparticles could change their MS value, size and surface charges. Also, the microbial analysis revealed that lipo-amino acid coated magnetic nanoparticles has the least adverse effect on microbial strain among tested SPIONs. Conclusion: This study showed lipo-amino acid could be considered as the most protective and even promotive surface coating, which is explained by its optimizing effect on cell penetration and negligible reductive effects on magnetic properties of SPIONs. lipo-amino acid coated magnetic nanoparticles could be used in microbial biotechnology and industrial microbiology.

scholarly journals Degraded Hyaluronic Acid-Modified Magnetic Nanoparticles

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Wan Nie ◽  
Baolin Zhang ◽  
Xianjia Yan ◽  
Lichao Su ◽  
Sheng Wang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Hyaluronic Acid ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Functional Groups ◽  
Biomedical Applications ◽  
Superparamagnetic Iron Oxide ◽  
Oxide Nanoparticles ◽  
Potential Applications ◽  
Modified Magnetic Nanoparticles

Superparamagnetic iron oxide nanoparticles (SPIONs) conjugated with hyaluronic acid (HA) functional groups have potential applications as cell targeting materials. However, SPIONs incubated with high-molecular weight HA can result in severe agglomeration. In this work, we found that when modified with degraded HA (hyaluronan oligosaccharides (oHAs)), the nanoparticles were uniformly dispersed with small hydrodynamic sizes, and the oHA-modified SPIONs exerted minimal cytotoxicity. With the same functional groups as HA, the oHA-modified SPIONs may have various biomedical applications.

Metalla-aromatic loaded magnetic nanoparticles for MRI/photoacoustic imaging-guided cancer phototherapy

2018 ◽  
Vol 6 (17) ◽  
pp. 2528-2535 ◽  
Author(s):  
Caixia Yang ◽  
Gan Lin ◽  
Congqing Zhu ◽  
Xin Pang ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Cancer Therapy ◽  
Iron Oxide Nanoparticles ◽  
Photoacoustic Imaging ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles

In this study, metalla-aromatic agents and a cluster of superparamagnetic iron oxide nanoparticles were loaded inside a micellar carrier and used for MRI/PA imaging-guided PTT/PDT synergistic cancer therapy.

scholarly journals Key Parameters on the Microwave Assisted Synthesis of Magnetic Nanoparticles for MRI Contrast Agents

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Maria Eugênia Fortes Brollo ◽  
Sabino Veintemillas-Verdaguer ◽  
Cesar Menor Salván ◽  
Maria del Puerto Morales
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Contrast Agents ◽  
Saturation Magnetization ◽  
Synthesis Method ◽  
Mri Contrast Agents ◽  
Microwave Assisted Synthesis ◽  
Organic Media ◽  
Experimental Conditions ◽  
Microwave Assisted

Uniform iron oxide magnetic nanoparticles have been synthesized using a microwave assisted synthesis method in organic media and their colloidal, magnetic, and relaxometric properties have been analyzed after its transference to water and compared with those nanoparticles prepared by thermal decomposition in organic media. The novelty of this synthesis relies on the use of a solid iron oleate as precursor, which assures the reproducibility and scalability of the synthesis, and the microwave heating that resulted in being faster and more efficient than traditional heating methods, and therefore it has a great potential for nanoparticle industrial production. The effect of different experimental conditions such as the solvent, precursor, and surfactant concentration and reaction time as well as the transference to water is analyzed and optimized to obtain magnetic iron oxide nanoparticles with sizes between 8 and 15 nm and finally colloids suitable for their use as contrast agents on Magnetic Resonance Imaging (MRI). The r2 relaxivity values normalized to the square of the saturation magnetization were shown to be constant and independent of the particle size, which means that the saturation magnetization is the main parameter controlling the efficiency of these magnetic nanoparticles as MRI T2-contrast agents.

Glyco-copolypeptide grafted magnetic nanoparticles: the interplay between particle dispersion and RNA loading

2016 ◽  
Vol 7 (19) ◽  
pp. 3221-3224 ◽  
Author(s):  
T. Borase ◽  
E. K. Fox ◽  
Fadwa El Haddassi ◽  
S.-A. Cryan ◽  
D. F. Brougham ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Block Copolymer ◽  
Iron Oxide Nanoparticles ◽  
Superparamagnetic Iron Oxide ◽  
Particle Dispersion ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles

Lysine-glyco-copolypeptide grafted superparamagnetic iron oxide nanoparticles were prepared through N-carboxyanhydride (NCA) copolymerization. Statistical and block copolymer arrangements were obtained while keeping the overal composition constant.

On the thermotropic and magnetotropic phase behavior of lipid liquid crystals containing magnetic nanoparticles

Nanoscale ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 3480-3488 ◽  
Author(s):  
Marco Mendozza ◽  
Costanza Montis ◽  
Lucrezia Caselli ◽  
Marcell Wolf ◽  
Piero Baglioni ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Iron Oxide ◽  
Liquid Crystals ◽  
Magnetic Nanoparticles ◽  
Magnetic Fields ◽  
Phase Behavior ◽  
Iron Oxide Nanoparticles ◽  
Superparamagnetic Iron Oxide ◽  
Oxide Nanoparticles ◽  
Promising Strategy

The inclusion of superparamagnetic iron oxide nanoparticles (SPIONs) in lipid mesophases is a promising strategy for drug-delivery applications, combining the innate biocompatibility of lipid architectures with SPIONs’ response to external magnetic fields.

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