Room-temperature fabrication of magnetite-boehmite sol-gel composites for heavy metal ions removal

Shapovalova, Olga E.; Drozdov, Andrey S.; Bryushkova, Ekaterina A.; Morozov, Maxim I.; Vinogradov, Vladimir V.

doi:10.1016/j.arabjc.2018.02.011

Cited by 27 publications

(20 citation statements)

References 76 publications

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“…The scheme of synthesis is provided in Supplementary Materials (Figure S7) . In brief, magnetite hydrosol was prepared in ultrasonically assisted synthesis from iron (II) chloride tetrahydrate and iron (III) chloride hexahydrate, as described previously [ 21 ]. The mass fraction of magnetite nanoparticles with average particle size 10 nm in the resulting sol was 2 wt.%.…”

Section: Methodsmentioning

confidence: 99%

Cationic Magnetite Nanoparticles for Increasing siRNA Hybridization Rates

et al. 2020

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An investigation of the interaction principles of nucleic acids and nanoparticles is a priority for the development of theoretical and methodological approaches to creating bionanocomposite structures, which determines the area and boundaries of biomedical use of developed nanoscale devices. «Nucleic acid—magnetic nanoparticle» type constructs are being developed to carry out the highly efficient detection of pathogens, create express systems for genotyping and sequencing, and detect siRNA. However, the data available on the impact of nanoparticles on the behavior of siRNA are insufficient. In this work, using nanoparticles of two classical oxides of inorganic chemistry (magnetite (Fe3O4) and silica (SiO2) nanoparticles), and widely used gold nanoparticles, we show their effect on the rate of siRNA hybridization. It has been determined that magnetite nanoparticles with a positive charge on the surface increase the rate of siRNA hybridization, while negatively charged magnetite and silica nanoparticles, or positively charged gold nanoparticles, do not affect hybridization rates (HR).

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Section: Methodsmentioning

confidence: 99%

Cationic Magnetite Nanoparticles for Increasing siRNA Hybridization Rates

et al. 2020

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“…The Fe 3 O 4 nanoparticles were synthesized by a coprecipitation method, as previously described [26,27]. An amount of 2.5 g FeCl 2 •4H 2 O and 5 g of FeCl 3 •6H 2 O were dissolved with 100 mL of deionized water.…”

Section: Synthesis Of Magnetite Nanoparticles (Mnps)mentioning

confidence: 99%

Test-System for Bacteria Sensing Based on Peroxidase-Like Activity of Inkjet-Printed Magnetite Nanoparticles

et al. 2020

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Rapid detection of bacterial contamination is an essential task in numerous medical and technical processes and one of the most rapidly developing areas of nano-based analytics. Here, we present a simple-to-use and special-equipment-free test-system for bacteria detection based on magnetite nanoparticle arrays. The system is based on peroxide oxidation of chromogenic substrate catalyzed by magnetite nanoparticles, and the process undergoes computer-aided visual analysis. The nanoparticles used had a pristine surface free of adsorbed molecules and demonstrated high catalytic activities up to 6585 U/mg. The catalytic process showed the Michaelis–Menten kinetic with Km valued 1.22 mmol/L and Vmax of 4.39 µmol/s. The nanoparticles synthesized were used for the creation of inkjet printing inks and the design of sensor arrays by soft lithography. The printed sensors require no special equipment for data reading and showed a linear response for the detection of model bacteria in the range of 104–108 colony-forming units (CFU) per milliliter with the detection limit of 3.2 × 103 CFU/mL.

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“…There are several ways to avoid these disadvantages: the surface of magnetite particles is coated with substances of various nature (organic surfactants, oxides with a porous structure, etc.) [ 5 , 6 ], or composite powders containing the second component with an improved texture are synthesized [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…A study of the boehmite-magnetite composite system obtained by the sol-gel method was published recently in Ref. [ 7 ]. The authors performed mixing of the same (positively) charged sols, as a result the system was aggregately stable over the entire range of ratios, and the final products provided a specific surface area of up to 391 m 2 /g.…”

Section: Introductionmentioning

confidence: 99%

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Study of heteroaggregation and properties of sol-gel AlOOH–Fe3O4 composites

Mikhaylov

Martakov

Gerasimov

et al. 2020

Heliyon

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In this work, AlOOH-Fe 3 O 4 powder nanocomposites for Cr(VI) adsorption were obtained for the first time using oppositely charged boehmite and citric acid modified magnetite sols. The process of heteroaggregation of oppositely charged AlOOH and Fe 3 O 4 nanoparticles was also studied as one of the stages in the preparation of adsorption active material. Сomposition, surface area, porous structure, thermal and surface properties, adsorption efficiency, and regenerability of nanocomposites were investigated using a wide range of analytical methods. It is noted that a low content of magnetite (2 wt.%) in the AlOOH-Fe 3 O 4 composite promotes an increase in the surface area, weakly affects the Cr(VI) adsorption capacity, and imparts magnetic properties to the composite. Low cost, simplicity of preparation, high Cr(VI) adsorption capacity (up to 21 mg/g), and stability in cyclic use are the advantages of the obtained nanocomposites in comparison with similar systems. They can easily be separated from the purified liquid using a permanent magnet due to their magnetic properties.

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Room-temperature fabrication of magnetite-boehmite sol-gel composites for heavy metal ions removal

Cited by 27 publications

References 76 publications

Cationic Magnetite Nanoparticles for Increasing siRNA Hybridization Rates

Cationic Magnetite Nanoparticles for Increasing siRNA Hybridization Rates

Test-System for Bacteria Sensing Based on Peroxidase-Like Activity of Inkjet-Printed Magnetite Nanoparticles

Study of heteroaggregation and properties of sol-gel AlOOH–Fe3O4 composites

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