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iron preparation

Matthew Essandoh, Rafael A Garcia
Magnetic particles entrapped in different matrices that display high thermal stability, low toxicity, interactive functions at the surface, and high saturation magnetization are of great interest. The objective of this work was to synthesize a novel hemoglobin/iron oxide composite (Hb/Fe3 O4 ) for the removal of different dyes (indigo carmine, naphthol blue black, tartrazine, erythrosine, eriochrome black T and bromophenol blue) from aqueous solutions. The Hb/Fe3 O4 composite was characterized using scanning electron microscopy (SEM), laser diffraction particle size analysis, FT-IR spectroscopy, isoelectric point determination and thermogravimetric analysis (TGA)...
May 10, 2018: Chemosphere
Soon Chang Lee, Yesul Jeong, Youn Jung Kim, Hyeran Kim, Hyun Uk Lee, Young-Chul Lee, Sang Moon Lee, Hae Jin Kim, Ha-Rim An, Myoung Gyu Ha, Go-Woon Lee, Young-Seak Lee, Gaehang Lee
In this study, hierarchically three-dimensional (3D) nanotubular sea urchin-shaped iron oxide nanostructures (3D-Fe2 O3 ) were synthesized by a facile and rapid ultrasound irradiation method. Additives, templates, inert gas atmosphere, pH regulation, and other complicated procedures were not required. Dense 3D-Fe2 O3 with a relatively large Brunauer-Emmett-Teller (BET) surface area of 129.4 m2 /g was synthesized within 23 min, and the BET surface area was further improved to 282.7 m2 /g by a post heat-treatment process...
April 23, 2018: Journal of Hazardous Materials
Ellen M H Schmitz, Niels M Leijten, Joost L J van Dongen, Maarten A C Broeren, Lech G Milroy, Luc Brunsveld, Volkher Scharnhorst, Daan van de Kerkhof
BACKGROUND: Targeted quantification of protein biomarkers with liquid chromatography-tandem mass spectrometry (LC-MS/MS) has great potential, but is still in its infancy. Therefore, we elucidated the influence of charge state distribution and matrix effects on accurate quantification, illustrated by the peptide hormone hepcidin. METHODS: An LC-MS/MS assay for hepcidin, developed based on existing literature, was improved by using 5 mM ammonium formate buffer as mobile phase A and as an elution solution for solid phase extraction (SPE) to optimize the charge state distribution...
May 19, 2018: Clinical Chemistry and Laboratory Medicine: CCLM
Hangzhen Lan, Leo D Salmi, Tuukka Rönkkö, Jevgeni Parshintsev, Matti Jussila, Kari Hartonen, Marianna Kemell, Marja-Liisa Riekkola
New chemical vapor reaction (CVR) and atomic layer deposition (ALD)-conversion methods were utilized for preparation of metal organic frameworks (MOFs) coatings of solid phase microextraction (SPME) Arrow for the first time. With simple, easy and convenient one-step reaction or conversion, four MOF coatings were made by suspend ALD iron oxide (Fe2 O3 ) film or aluminum oxide (Al2 O3 ) film above terephthalic acid (H2 BDC) or trimesic acid (H3 BTC) vapor. UIO-66 coating was made by zirconium (Zr)-BDC film in acetic acid vapor...
September 18, 2018: Analytica Chimica Acta
Shishu Zhu, Xiaochen Huang, Dawei Wang, Li Wang, Fang Ma
The superiority of the nanoscale zero valent iron (nZVI) assisted biochar (BC) composites compared to traditional nZVI and its application feasibility are still unclear. This study aimed to provide valuable information for practical application. Firstly, the Fe/BC mass ratio of 2:1 during the preparation of nZVI-BC was proved obtaining the complete Cr6+ removal. Then, results revealed that the initial pH value tuned Cr6+ removal performance via varying existing Cr6+ species, surface charge, and chemical states of iron nanoparticles (NPs)...
May 9, 2018: Chemosphere
Akif Zeb, Shafaq Sahar, Umair Yaqub Qazi, Atheer Hameid Odda, Naseeb Ullah, Ya-Nan Liu, Ishtiaq A Qazi, An-Wu Xu
Heteropolyacids (HPAs) are a class of polyoxometallates (POMs) with oxygen-rich surfaces. Herein, we have developed an Fe-containing heteropolyacid by cation-exchange and employed KFePW12O40 nanostructures for Fenton, photo-Fenton and enzyme-mimetic reactions. The as-prepared KFePW12O40 catalyst exhibits efficient degradation of Rhodamine B (RhB) via the photo-Fenton reaction. As an enzyme-mimetic, this material can effectively oxidize TMB and dopamine. The obtained nanomaterials were characterized via SEM, TEM, XPS, BET surface area, TGA, UV-Vis spectroscopy, FT-IR, and XRD techniques...
May 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Xin Wen, Huanhuan Zhang, Fei Tian, Xiaofang Liu, Libo Niu, Guoyi Bai
A novel H3PW12O40 deposited chitosan coated iron oxide magnetic core-shell nanocomposite (Fe3O4@CS@HPW) was prepared via a facile approach. Fe3O4 nanoparticles were first coated with crosslinking-agent-free chitosan, and then H3PW12O40 was loaded onto the surface of chitosan as an outer shell. The resultant nanocomposite was well characterized by Brunauer-Emmett-Teller surface area analysis (BET), inductively coupled plasma analysis (ICP), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and elemental mappings...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Sunita Barik, Sushanta K Badamali, Sagarika Sahoo, Nandakishor Behera, Sudhir E Dapurkar
The present study is focussed on development of highly dispersed nanosize iron oxide (FexOy) particles within the uniform mesopore channels of SBA-3. Herein we report a comparative study between conventional incipient wetness and microwave assisted synthesis routes adopted to devise nanoparticles. The developed materials are characterised by following X-ray diffraction, high resolution transmission electron microscopy, proton induced X-ray emission, diffuse reflectance UV-visible spectroscopy, thermogravimetry and Fourier transform infrared spectroscopy...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Katerina Hruskova, Eliska Potuckova, Lukas Opalka, Tereza Hergeselova, Pavlina Haskova, Petra Kovarikova, Tomas Simůnek, Katerina Vavrova
Aroylhydrazone iron chelators such as salicylaldehyde isonicotinoyl hydrazone (SIH) protect various cells against oxidative injury and/or display antineoplastic activities. Previous studies have shown that a nitro-substituted hydrazone, namely, NHAPI, displayed markedly improved plasma stability, selective antitumor activity, and moderate antioxidant properties. In this study, we prepared four series of novel NHAPI derivatives and explored their iron chelation activities, anti- or pro-oxidant effects, protection against model oxidative injury in the H9c2 cell line derived from rat embryonic cardiac myoblasts, cytotoxicities to the corresponding noncancerous H9c2 cells, and antiproliferative activities against the MCF-7 human breast adenocarcinoma and HL-60 human promyelocytic leukemia cell lines...
May 16, 2018: Chemical Research in Toxicology
Álvaro Raya-Barón, Carmen P Galdeano-Ruano, Pascual Oña-Burgos, Antonio Rodríguez-Diéguez, Robert Langer, Rosalía López-Ruiz, Roberto Romero-González, Istemi Kuzu, Ignacio Fernández
The reaction of 1-((2-(pyridin-2-yl)ethyl)amino)anthraquinone with either Fe(HMDS)2 or Li(HMDS)/FeCl2 allowed the preparation of a new anthraquinoid-based iron(ii) complex active in the hydrosilylations of carbonyls. The new complex Fe(2)2 was characterized by single-crystal X-ray diffraction, infrared spectroscopy, NMR, and high resolution mass spectrometry (electrospray ionization). Superconducting quantum interference device (SQUID) magnetometry established no spin crossover behavior with an S = 2 state at room temperature...
May 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Tsvi Katchalski, Tom Case, Keun-Young Kim, Ranjan Ramachandra, Eric A Bushong, Thomas J Deerinck, Matthias G Haberl, Mason R Mackey, Steven Peltier, Guillaume A Castillon, Nobuko Fujikawa, Albert R Lawrence, Mark H Ellisman
Biological samples are frequently stained with heavy metals in preparation for examining the macro, micro and ultra-structure using X-ray microtomography and electron microscopy. A single X-ray microtomography scan reveals detailed 3D structure based on staining density, yet it lacks both material composition and functional information. Using a commercially available polychromatic X-ray source, energy integrating detectors and a two-scan configuration labelled by their energy- "High" and "Low", we demonstrate how a specific element, here shown with iron, can be detected from a mixture with other heavy metals...
May 15, 2018: Scientific Reports
Ning Tian, Penglin Zhang, Junping Zhang
Colorful super anti-wetting coatings are receiving growing attention, but are challenging to invent. Here, we report a general method for preparing mechanically robust and thermally stable colorful superamphiphobic coatings. A composite of palygorskite (PAL) nanorods and iron oxide red (IOR) was prepared by solid-state grinding or hydrothermal reaction, which was then modified by hydrolytic condensation of silanes to form a suspension. Superamphiphobic coatings were prepared by spray-coating the suspension onto substrates...
2018: Frontiers in Chemistry
Parasmani Pageni, Peng Yang, Marpe Bam, Tianyu Zhu, Yung Pin Chen, Alan W Decho, Mitzi Nagarkatti, Chuanbing Tang
Over-prescription and improper use of antibiotics has led to the emergence of bacterial resistance, posing a major threat to public health. There has been significant interest in the development of alternative therapies and agents to combat antibiotic resistance. We report the preparation of recyclable magnetic iron oxide nanoparticles grafted with charged cobaltocenium-containing metallopolymers by surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization. β-Lactam antibiotics were then conjugated with metallopolymers to enhance their vitality against both Gram-positive and Gram-negative bacteria...
May 3, 2018: Biomaterials
Ruta Gruskiene, Tatjana Krivorotova, Ramune Staneviciene, Dalius Ratautas, Elena Serviene, Jolanta Sereikaite
Nisin is a known bacteriocin approved as a food additive for food preservation. It exhibits a wide spectrum antimicrobial activity against Gram-positive bacteria. Iron oxide magnetic nanoparticles were synthesized and characterized by X-ray diffraction method. A main part of iron oxide nanoparticles was found to be maghemite though a small quantity of magnetite could also be present. Magnetic nanoparticles were stabilized by citric, ascorbic, gallic or glucuronic acid coating. Stable iron oxide magnetic nanoparticles were functionalized by nisin using a simple and low cost adsorption method...
May 8, 2018: Colloids and Surfaces. B, Biointerfaces
N Earnest, S Chakram, Y Lu, N Irons, R K Naik, N Leung, L Ocola, D A Czaplewski, B Baker, Jay Lawrence, Jens Koch, D I Schuster
We realize a Λ system in a superconducting circuit, with metastable states exhibiting lifetimes up to 8 ms. We exponentially suppress the tunneling matrix elements involved in spontaneous energy relaxation by creating a "heavy" fluxonium, realized by adding a capacitive shunt to the original circuit design. The device allows for both cavity-assisted and direct fluorescent readouts, as well as state preparation schemes akin to optical pumping. Since direct transitions between the metastable states are strongly suppressed, we utilize Raman transitions for coherent manipulation of the states...
April 13, 2018: Physical Review Letters
Chuan Wu, MengQian Cui, ShengGuo Xue, WaiChin Li, Liu Huang, XingXing Jiang, ZiYan Qian
Arsenic contamination in paddy soils has aroused global concern due to its threats to food security and human health. Biochar modified with different iron materials was prepared for arsenic (As) immobilization in contaminated soils. Soil incubation experiments were carried to investigate the effects of biochar modified with Fe-oxyhydroxy sulfate (Biochar-FeOS), FeCl3 (Biochar-FeCl3 ), and zero-valent iron (Biochar-Fe) on the pH, NaHCO3 -extractable As concentrations, and the As fractions in soils. The scanning electron microscope and X-ray diffraction analysis demonstrated that iron was successfully loaded onto the surface or embedded into the pores of the biochar...
May 13, 2018: Environmental Science and Pollution Research International
Zeinab Sharafi, Bita Bakhshi, Jaber Javidi, Sina Adrangi
The Stober process is frequently used to prepare silica-coated iron oxide nanoparticles. This is usually achieved by seeding a reaction mixture consisting of water, ethanol and a catalyst with iron oxide particles and adding a silica precursor. The hydrolysis and condensation of precursor monomers results in the deposition of a silica layer on iron oxide particles. However, this process is accompanied by an increase in the ionic strength of the medium which promotes the rapid aggregation of iron oxide particles...
2018: Iranian Journal of Pharmaceutical Research: IJPR
Nadia Maria Porpiglia, Elio Franco De Palo, Sergey Alexandrovich Savchuk, Svetlana Alexandrovna Appolonova, Federica Bortolotti, Franco Tagliaro
BACKGROUND AND AIM: The non-glycosylated glycoform of transferrin (Tf), known as asialo-Tf, was not selected (in favor of disialo-Tf) as the measurand for the standardization of carbohydrate deficient transferrin (CDT) determination because of a lower diagnostic sensitivity provided with the currently available analytical procedures for sera. However, asialo-Tf could provide an additional value to disialo-Tf in the CDT analysis employed in forensic toxicology contexts. The present work aimed at developing an easy sample preparation based on PEG precipitation in order to improve the detectability of asialo-Tf in capillary electrophoresis (CE)...
May 10, 2018: Clinica Chimica Acta; International Journal of Clinical Chemistry
Jianjun Hu, Chong Li, Qianhui Guo, Jiatao Dang, Quanguo Zhang, Duu-Jong Lee, Yunlong Yang
The iron-based oxygen carriers (OC's), Fe2 O3 /support (Al2 O3 , TiO2 , SiO2 and ZrO2 ), for chemical looping gasification of wheat straw were prepared using impregnation method. The surface morphology, crystal structure, carbon deposition potential, lattice oxygen activity and selectivity of the yielded OCs were examined. The Fe2 O3 /Al2 O3 OCs at 60% loading has the highest H2 yield, H2 /CO ratio, gas yield, and carbon conversion amongst the tested OC's. Parametric studies revealed that an optimal loading Fe2 O3 of 60%, steam-to-biomass ratio of 0...
May 3, 2018: Bioresource Technology
Narada Bombuwala Dewage, Achala S Liyanage, Charles U Pittman, Dinesh Mohan, Todd Mlsna
α-Fe2 O3 and Fe3 O4 dispersed on high surface area (663 m2 /g) Douglas fir biochar (BC) was prepared for fast nitrate and fluoride ion removal from water using magnetic separations. This biochar, made originally at 900 °C, was impregnated with FeCl3 and converted by pyrolysis at 600 °C to magnetic (494 m2 /g) biochar (MBC). MBC and its precursor BC were characterized using SEM, SEM-EDX, STEM, SBET , PZC measurements, XRD analysis, and XPS. Dispersed α-Fe2 O3 and Fe3 O4 particles caused magnetization and generated most adsorption sites, causing more nitrate and fluoride uptake than BC...
May 2, 2018: Bioresource Technology
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