Article
Geochemistry & Geophysics
Marcella Di Bella, Franco Pirajno, Giuseppe Sabatino, Simona Quartieri, Roberto Barbieri, Barbara Cavalazzi, Annalisa Ferretti, Roberto Danovaro, Teresa Romeo, Franco Andaloro, Valentina Esposito, Gianfranco Scotti, Alessandro Tripodo, Francesco Italiano
Summary: High-resolution images from NASA rovers on Mars revealed mm-size loose haematite spherulitic deposits, similar to terrestrial iron-ooids. The formation of these Martian spherules shares similarities with iron spherules currently forming on Earth near active submarine hydrothermal systems. The recent discovery of a still working iron-ooid source on Earth indicates past hydrothermal activity on Mars could potentially be the cause of formation of these enigmatic iron grains.
Article
Chemistry, Multidisciplinary
Jeffrey Paulo H. Perez, Dominique J. Tobler, Helen M. Freeman, Andy P. Brown, Nicole S. Hondow, Case M. van Genuchten, Liane G. Benning
Summary: The study quantified the influence of As(iii) and As(v) on the crystallization of GR sulfate (GRSO4) and found that As(iii) had a stronger inhibitory effect than As(v), reducing structural coherence and ordering in As(iii)-bearing GRSO4 crystals. Mineral-bound As(iii) significantly increased the stability of GRSO4 phase and fully prevented its transformation to magnetite even after 720 hours.
ENVIRONMENTAL SCIENCE-NANO
(2021)
Article
Geochemistry & Geophysics
Chengshuai Liu, Michael S. Massey, Drew E. Latta, Yafei Xia, Fangbai Li, Ting Gao, Jian Hua
Summary: This study elucidates the reaction processes of aqueous Fe(II) with ferromanganese nodules and discusses its impact on the exchange of Fe atoms and the formation of magnetite in the nodules. The observed Fe(II)-induced recrystallization of nodules is expected to play a significant role in influencing the geochemical behavior of elements in nodule-enriched soils.
Article
Green & Sustainable Science & Technology
Xiao Zhou, Guihua Liu, Tiangui Qi, Jiasheng Zhao, Zhihong Peng, Yilin Wang, Leiting Shen
Summary: The surface magnetization technique can improve the efficiency of iron recovery from high-iron red mud. Increasing the temperature and NaOH concentration can enhance the iron recovery, while prolonging magnetization time has a negative effect. Coarse particles in the red mud contribute to higher iron recovery and total iron content in the concentrate.
JOURNAL OF SUSTAINABLE METALLURGY
(2023)
Article
Engineering, Environmental
Katrin Schulz, Laurel K. ThomasArrigo, Ralf Kaegi, Ruben Kretzschmar
Summary: This study investigates the effect and fate of silicate during Fe mineral recrystallization and transformation. The results show that the solid phase Si/Fe ratio strongly influences the extent of ferrihydrite transformation, while the Fe(II)/Fe(III) ratio has a minor effect. Silicate increases the thickness of lepidocrocite crystallites and inhibits the transformation of lepidocrocite when adsorbed. Silicate is an important factor to consider in understanding Fe mineral dynamics in reducing soil conditions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Giovanni Marco Saladino, Carmen Vogt, Bertha Brodin, Kian Shaker, Nuzhet Inci Kilic, Kenth Andersson, Marie Arsenian-Henriksson, Muhammet Sadaka Toprak, Hans Martin Hertz
Summary: In this study, hybrid ruthenium-decorated superparamagnetic iron oxide nanoparticles were designed as contrast agents for both magnetic resonance imaging (MRI) and X-ray fluorescence computed tomography (XFCT). These nanoparticles were synthesized through a one-pot polyol hot injection method. In vivo preclinical studies showed the possibility of correlative bioimaging using these contrast agents. The complementary nature of MRI and XFCT allowed for accurate localization and high specificity and resolution in nanoparticle detection, suggesting potential applications for early tumor diagnosis, improved long-term treatment monitoring, and enhanced radiotherapy planning.
Article
Environmental Sciences
Jianwei Lin, Weijie Xiang, Yanhui Zhan
Summary: The characteristics and mechanism of phosphate adsorption onto magnetite, hematite, and goethite were comparatively studied, and it was found that magnetite has a higher adsorption capacity. Additionally, the amendment and capping materials of magnetite, hematite, and goethite can effectively suppress the release of endogenous phosphorus from sediment into the overlying water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Anastasiia Kobyliukh, Karolina Olszowska, Marcin Godzierz, Aleksandra Kordyka, Jerzy Kubacki, Yevgen Mamunya, Slawomira Pusz, Ivanka Stoycheva, Urszula Szeluga
Summary: Various facile approaches were used to prepare hybrids of graphene nanoplatelets and graphene oxide with iron oxides nanoparticles. The effects of graphene material and preparation procedures on the hybrids' structural characteristics were studied, and potential applications in various fields were discussed.
APPLIED SURFACE SCIENCE
(2022)
Article
Environmental Sciences
Jianwei Lin, Weijie Xiang, Yanhui Zhan
Summary: The characteristics and mechanism of phosphate adsorption onto magnetite, hematite and goethite were studied, and the effects of magnetite, hematite and goethite amendment and capping on endogenous phosphorus (P) liberation from sediment into overlying water (OW) were investigated. The adsorption of phosphate onto magnetite, hematite and goethite followed the inner-sphere complexation mechanism, and the phosphate adsorption capacity decreased in the order of magnetite>goethite>hematite. The magnetite, hematite and goethite amendment can all decrease the risk of endogenous P release into OW, with magnetite being the most effective.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Andrey S. Skrypnik, Qingxin Yang, Alexander A. Matvienko, Victor Yu Bychkov, Yuriy P. Tulenin, Henrik Lund, Sergey A. Petrov, Ralph Kraehnert, Aleks Arinchtein, Jana Weiss, Angelika Brueckner, Evgenii Kondratenko
Summary: This study provides fundamental knowledge for developing Fe-based catalysts for CO2 hydrogenation to higher hydrocarbons, with well-defined compositions prepared through controlled decomposition of iron oxalate. The research also elucidates the pathways from CO2 to CO, CH4, and higher hydrocarbons, establishing a correlation between reaction pathways and steady-state composition for tailored catalyst design and preparation. The best performing Fe-based catalyst achieves a selectivity to CH4 below 10%, with a selectivity to C2+-hydrocarbons around 50% at 25% CO2 conversion and 300 degrees C, with an olefin to paraffin ratio of 5.5 among C-2-C-4 hydrocarbons.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Analytical
Karolina Syrek, Sylwia Kemona, Joanna Czopor, Leszek Zaraska, Grzegorz D. Sulka
Summary: In this study, nanostructured iron oxide was obtained through anodization, and its crystalline phases were identified using XRD analysis. It was found that the material can efficiently absorb visible light.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Environmental Sciences
Katja Schmeide, Andre Rossberg, Frank Bok, Salim Shams Aldin Azzam, Stephan Weiss, Andreas C. Scheinost
Summary: The interaction between nuclear waste container materials in deep geological repositories and the actinide fission product technetium was studied, revealing a high retention capacity of chukanovite towards Tc-VII, primarily controlled by pH levels.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Physical
Enrico Bianchetti, Cristiana Di Valentin
Summary: Through density functional theory calculations, it has been found that using multidentate ligands can inhibit the process of spin-canting in nanoparticles, and the presence of anchoring organic acids can also interfere with structural disorder.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Guotao Zhou, Yilin Wang, Tiangui Qi, Qiusheng Zhou, Guihua Liu, Zhihong Peng, Xiaobin Li
Summary: This study investigated the interactions between anatase or kaolinite and goethite during the Bayer digestion process. It was found that both anatase and kaolinite hindered the transformation of goethite, with anatase having a more significant effect. However, the addition of the reductant hydrazine hydrate could eliminate this inhibitory effect and promote the transformation of goethite into magnetite.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Chemistry, Physical
Andrei Shoppert, Dmitry Valeev, Mamodou Malal Diallo, Irina Loginova, Marie Constance Beavogui, Abdukhakim Rakhmonov, Yevgeniy Ovchenkov, Denis Pankratov
Summary: This study investigates the hydrochemical conversion of goethite to magnetite in high-iron bauxite residue. The results demonstrate the possibility of obtaining pure magnetite and achieving high extraction ratio of aluminum under specific conditions.
Article
Geochemistry & Geophysics
Johanna M. Blake, Sumant Avasarala, Abdul-Mehdi S. Ali, Michael Spilde, Juan S. Lezama-Pacheco, Drew Latta, Kateryna Artyushkova, Anastasia G. Ilgeng, Christopher Shuey, Christopher Nez, Jose M. Cerrato
Article
Chemistry, Multidisciplinary
Luiza Notini, Drew E. Latta, Anke Neumann, Carolyn I. Pearce, Michel Sassi, Alpha T. N'Diaye, Kevin M. Rosso, Michelle M. Scherer
ACS EARTH AND SPACE CHEMISTRY
(2019)
Article
Geochemistry & Geophysics
Piyali Chanda, Zhe Zhou, Drew E. Latta, Michelle M. Scherer, Brian L. Beard, Clark M. Johnson
Article
Engineering, Environmental
Amina Grant, Michelle M. Scherer, Danielle Land, David M. Cwiertny, Marc A. Edwards, Jerry Mount, Drew E. Latta
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2020)
Article
Environmental Sciences
Zhe Zhou, Drew E. Latta, Michelle M. Scherer
Summary: The study showed that the presence of natural organic matter (NOM) inhibits the Fe(II)-catalyzed transformation of ferrihydrite (Fh). Nickel associated with SRNOM-Fh was found to be more susceptible to acid extraction compared to Fh in the presence of Fe(II). Transformation to secondary minerals may be necessary for nickel stabilization to occur.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Edward J. O'Loughlin, Maxim Boyanov, Christopher A. Gorski, Michelle M. Scherer, Kenneth M. Kemner
Summary: The bioreduction of Fe(III) oxides by dissimilatory iron-reducing bacteria leads to the formation of various Fe(II)-bearing secondary minerals, which are influenced by the mineralogy of Fe(III) oxides, phosphate concentration, and the availability of electron shuttles. The overall extent of Fe(II) production and the types of secondary minerals formed are highly dependent on these factors, demonstrating a complex interplay of mineralogical, geochemical, and microbiological factors.
Article
Instruments & Instrumentation
Lara K. Bogart, Jeppe Fock, Geraldo M. da Costa, Kerstin Witte, Jean-Marc Greneche, Jan Zukrowski, Marcin Sikora, Drew E. Latta, Michelle M. Scherer, Mikkel Fougt Hansen, Cathrine Frandsen, Quentin A. Pankhurst
Summary: This study tested the Fe-57 Mossbauer spectrometric 'centre of gravity' method for quantifying the composition ratio of magnetite/maghemite in biphasic magnetic nanoparticles. The results showed that the method is repeatable and the data analysis phase has a minor contribution to the overall measurement uncertainty. Therefore, the COG method is considered a promising and robust candidate.
Article
Engineering, Environmental
Thomas C. Robinson, Drew E. Latta, Johna Leddy, Michelle M. Scherer
Summary: Predicting the redox behavior of magnetite in reducing soils and sediments is challenging due to inconsistent measured potentials and the lack of consensus on relevant Fe(III) | Fe(II) equilibria. In this study, we measured open-circuit potentials of stoichiometric magnetite equilibrated under various solution conditions and found Nernstian behavior in certain conditions. Our findings suggest that the maghemite/Fe(II)aq couple accurately predicts the redox behavior of stoichiometric magnetite suspensions in the presence of aqueous Fe(II) between pH values of 6.5 and 8.5. Additionally, a distinct shift in potentials was observed at higher pH values and without added Fe(II), indicating a change in the dominant Fe(III)|Fe(II) couple(s) poising the potential.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Drew Latta, Kevin M. Rosso, Michelle M. Scherer
Summary: The transformation of nanocrystalline ferrihydrite to more stable microcrystalline Fe(III) oxides under reducing conditions with aqueous Fe(II) present is a rapid process. The initial phase of this transformation, involving nucleation and growth of product minerals, remains unclear. This study used Fe isotopes, Mossbauer spectroscopy, and extractions to track the interactions between ferrihydrite and Fe(II) during this initial phase. The findings suggest that the mineralogical changes during the initial lag phase are critical to understanding ferrihydrite behavior in soils and sediments, particularly in relation to metal uptake and release.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Chemistry, Analytical
Thomas C. Robinson, Drew E. Latta, Luiza Notini, Keith E. Schilling, Michelle M. Scherer
Summary: The abiotic reduction of nitrite by Fe(II) species has been shown to be a significant source of atmospheric nitrous oxide emissions. However, the rates of chemodenitrification and N2O yields vary among different Fe(II) species, and the competition between abiotic and biological nitrite reduction is still unclear. Our study found significant variations in nitrite reduction rates and N2O recovery among Fe(II) species, suggesting that both chemodenitrification and biological denitrification may occur simultaneously in redox active sediments and soils.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2021)
