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Biosynthesis Scale-Up Process for Magnetic Iron-Oxide Nanoparticles Using Extract and Their Separation Properties in Lubricant-Water Emulsions.
Nanomaterials (Basel)
March 2025
Grupo de Investigación de Nanotecnología Aplicada para Biorremediación Ambiental, Energía, Biomedicina y Agricultura (NANOTECH), Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Av. Venezuela Cdra 34 S/N, Ciudad Universitaria, Lima 15081, Peru.
The use of natural organic extracts in nanoparticle synthesis can reduce environmental impacts and reagent costs. With that purpose in mind, a novel biosynthesis procedure for the formation of magnetic iron-oxide nanoparticles (IONPs) using extract in an aqueous medium has been systematically carried out. First, the biosynthesis was optimized for various extract concentrations, prepared by decoction and infusion methods, and yielded IONPs with sizes from 4 to 9 nm.
View Article and Find Full Text PDFIsotopic Exchange between Aqueous Fe(II) and Solid Fe(III) in Lake Sediment─A Kinetic Assemblage Approach.
Environ Sci Technol
March 2025
GEUS, Geological Survey of Denmark and Greenland, DK-1350 Copenhagen, Denmark.
The catalytic effect of aqueous Fe(II) (Fe) on the transformation of Fe(oxyhydr)oxides has been extensively studied in the laboratory. It involves the transfer of electrons between Fe and Fe-(oxyhydr)oxides, rapid atomic exchange of Fe between the two states, and recrystallization of the Fe-oxides into more stable Fe-(oxyhydr)oxides. The potential occurrence of these reactions in natural soils and sediments can have an important impact on biogeochemical cycling of iron, carbon, and phosphorus.
View Article and Find Full Text PDFCharacteristics of phosphorus transformation from vivianite mediated by sulphide.
J Environ Sci (China)
August 2025
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
The release of phosphorus (P) from anaerobic sediments becomes the dominant source of P loading with effective control of external P pollution. As a crucial component responsible for binding P, vivianite (Fe(PO)·8HO) in sediment inevitably impacts the P level and transformation. The release of P from vivianite mediated by sulphide was investigated using simulated overlying water-sediment and chemical reaction systems.
View Article and Find Full Text PDFLaser-ablation vs. bulk tissue ICP-MS for conifer tissue elemental analysis.
Chemosphere
April 2025
Institute of Forestry and Conservation, University of Toronto, 33 Willcocks St, Toronto, M5S 3B3, Canada.
Laser ablation inductively coupled plasma mass spectrometry (LA ICP-MS) has emerged as a robust tool for directly measuring trace elements in solid, intact samples. Laser ablation requires minimal sample preparation, whereas more conventional bulk sample analysis entails preliminary size reduction and acid digestion, and hence risks sample contamination and volatilization losses. LA ICP-MS may allow for rapid determination of elemental constitution in plants at low detection limits; however, application of LA ICP-MS on plant tissues is challenged by sample heterogeneity, as well as the lack of recognized standards for calibration and criteria for sample preparation.
View Article and Find Full Text PDFComprehensive Methodology for Evaluating the Drug Loading of Iron Oxide Nanoparticles Using Combined Magnetometry and Mössbauer Spectroscopy.
Molecules
February 2025
National Institute of Materials Physics, 077125 Magurele, Romania.
A methodology for the quantitative estimation of the drug loading of iron oxide-based magnetic nanoparticles by corroborating magnetometry and Mössbauer spectroscopy investigations is reported. The proposed methodology is exemplified in the case of two series of nanoparticles, namely FeO nanoparticles covered with citric acid molecules and further functionalized with doxorubicin, and FeO nanoparticles covered with L-Cysteine molecules and further functionalized with doxorubicin. The general idea of the proposed methodology is to probe the real magnetic structure of the magnetic core via low-temperature Mössbauer spectroscopy for the correct estimation of the spontaneous magnetization of the magnetic core.
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