Hematite and goethite nanoparticles were used as model minerals to investigate their aggregation kinetics under soil environmental conditions in the present study. The hydrodynamic diameters of hematite and goethite nanoparticles were 34.4 and 66.3 nm, respectively. The positive surface charges and zeta potential values for goethite were higher than for hematite. The effective …
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Hematite inevitably affects the environmental behavior and bioavailability of NPs due to its natural abundance and high chemical affinity [10]. It has been found that hematite particles could aggregate with graphene oxide by electrostatic attraction and form primary clusters, which were further bridged by graphene oxide to form larger clusters ...
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The interactions between these MeO x and redox-sensitive elements may involve both the photo-catalytic redox reactions and surface adsorption, and the interplay of the two processes, therefore, makes the interactions rather complex and may have unique environmental effects. The complex interactions between Cr (Cr(III) or Cr(VI)) and hematite ...
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To evaluate the effects of hematite (HMT) on the stabilization of PTEs, 1–5% (by weight) of HMT was added into a contaminated red soil amended with hydroxyapatite (HAP) to …
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1 Division of Environmental Science and Engineering, Colorado School of Mines, Golden 80401, USA. ... When NOM and As were incubated together with hematite, NOM dramatically delayed the attainment of sorption equilibrium and diminished the extent of sorption of both arsenate and arsenite. Consistent with this result, when NOM and As were ...
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The presence of oxyanions, such as nitrate (NO3–) and phosphate (PO43–), regulates the nucleation and growth of goethite (Gt) and hematite (Hm) during the transformation of ferrihydrite (Fh). Our previous studies showed that oxyanion surface complexes control the rate and pathway of Fh transformation to Gt and Hm. However, how oxyanion surface complexes …
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Negligible effects on the adsorption capacities of the organoarsenicals on hematite with different ionic strengths were observed. ... Facet-dependent contaminant removal properties of hematite nanocrystals and their environmental implications. Environ Sci Nano, 5 (2018), pp. 1790-1806, 10.1039/C8EN00548F. View in Scopus Google Scholar
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This study was carried out to assess the effects of hematite nanoparticles (α-Fe2O3) on the motility and phytoavailability of arsenic in contaminated soils and corn growth. A factorial experiment was conducted using a completely randomized design and three replications. The examined factors were the application rates of hematite nanoparticles (0, 0.05, 0.1 and …
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Iron oxides such as hematite (a and d) and goethite (b and e) are among the most common minerals found on Earth. Pyrite (c and f) is an iron sulfide known as "fool's gold" because of its ...
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Climate change is happening. Global average temperature has increased about 1.7°F from 1970 to 2023. 1 Changes of one or two degrees in the average temperature of the planet can cause potentially dangerous shifts in climate and weather. These real, observable changes are what we call climate change impacts because they are the visible ways that …
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Red soils are particularly rich in oxidized irons that have a distinctive red color, and they cover about one third of the earth's land area [1].Such irons comprise hematite (Fe 2 O 3), goethite (FeO(OH)), and magnetite (Fe 3 O 4), of which hematite is the most extensive elements in terrestrial systems [2].There are a large number of >Fe-OH amphoteric groups on the …
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The magnetic and color properties of the mineral hematite give clues to past environmental conditions and is being used for paleoclimatic reconstruction.
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The two most prevalent forms of iron ore are magnetite and hematite. Steel production uses over 98% of the iron ore available on the global market. Iron ore is a significant material that is used to extract metallic iron. ... Smelters are surrounded by barren areas due to the environmental effects of historical smelting. After decades of damage ...
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The sensitivity of IR spectroscopy toward the protonation of phosphate is well illustrated by the differences between the IR spectra of PO 3− 4 (aq), HPO 2− 4 (aq), H 2 PO − 4 (aq), and H 3 PO 0 4 (aq) shown in Fig. 1.The spectra of these aqueous phosphate species have also been reported by Tejedor-Tejedor and Anderson [5], and are useful for demonstrating the …
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Here, we find that hematite nanoparticles with specific facet-control can efficiently catalyze PAEs hydrolysis under ambient humidity conditions, with the hydrolysis rates 2 orders of magnitude...
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The interfacial behaviors of chromium are fundamental for understanding the environmental effects of chromium in contaminated environments. However, complex surfaces can cause chromium to exhibit a variety of behaviors, especially when humic substances are considered. ... Hematite (Hem) was also synthesized using the hydrothermal method. In ...
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Previous studies have highlighted the role of chemical oxidants in augmenting electron acceptors in the environment (Chen et al., 2024), thereby facilitating the anaerobic degradation of PAHs (Liao et al., 2018).Iron minerals, such as hematite (α-Fe 2 O 3) (Sajid et al., 2023) and goethite (α-FeO(OH) (Tang et al., 2018), renowned for their environmental safety …
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The first Earth Day sparked a movement and incredible environmental progress. More than 50 years later, the fight to protect our planet is more urgent than ever. Donate now to help us reach our ...
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The findings highlight the considerable effects of facets, one of the most intrinsic properties of nanocrystals in determining the reactivity of naturally occurring metal-based …
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Hematite (Fe2O3) This document provides a brief description of hematite, its uses, and the potential hazards associated with short and long term exposure. Environmental impact information for accidental releases is included. This information is general in nature and is not intended as a replacement for the safety data
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Improvement of soil agronomic properties by treatment with nanomaterials with zero environmental impact, such as iron oxide NPs (e.g., magnetite, hematite, and ferrihydrite, which are ubiquitous in natural soils), can facilitate their application under an "eco-product" label for improvement of plant growth and soil quality (Pédrot et al ...
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However, beyond its industrial importance, hematite offers numerous environmental benefits, making it a crucial resource in the global transition toward more …
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Hematite (α-Fe 2 O 3) based nanomaterials are considered as the most promising photoelectrodes for solar water splitting.However, some inherent shortcomings like high density of surface states is still the critically challengeable issue. This paper reports the integration of In 2 O 3 nanolayers (NLs) on the surface of worm-like Fe 2 O 3 films to significantly improve the …
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There has been a growing concern with the environmental influences of nanomaterials due to recent developments in nanotechnology. This study investigates the impact and fate of hematite nanoparticles (α-Fe 2 O 3 NPs) (∼14 nm in size) on a crop species, barley (Hordeum vulgare L.). For this purpose, hematite NPs (50, 100, 200, and 400 mg/L) were …
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This paper is the first part of a two-part basic research on the aqueous interactions of hematite (α-Fe 2 O 3) and alumina (α-Al 2 O 3) with pyrite, and whether these minerals influence the overall dynamics of pyrite oxidation.The general scope of this part is three-fold: (1) to investigate the effects of hematite and alumina particles on the overall dissolution of pyrite, (2) …
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We emphasize the reductive dissolution of hematite facets and elucidate corresponding environmental implications. Furthermore, we focus on facet …
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Adsorption of engineered nanoparticles (NPs) onto bacterial cells is critical for quantifying nanobio interactions as well as toxicokinetic properties of NPs. The purpose of this work was to study adsorption of hematite (α-Fe2O3) NPs onto Escherichia coli cells and to determine the particle size effects on the adsorption kinetics. Adsorption of large NPs (76 and …
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Goethite (α-FeOOH) is a widespread soil mineral and a major component of many ores, sediments and soils and it is one of the most thermodynamically stable iron oxide (Cornell and Schwertmann, 2003).Goethite can be found in both humid and semiarid regions and also appears as the weathering product of various iron-containing rocks (Kemp, 1985).The …
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Recently, hematite (the most abundant iron oxide polymorph) has received increasing attention due to its excellent properties and has shown many applications in various areas, such as energy storage (Wu et al., 2016), catalysis (Tilley et al., 2010; Zhang et al., 2020), industrial pigments and paints (Argote et al., 2020; Hashimoto et al., 2020), and environmental …
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In this study, the concentration and size effects of hematite on the ARGs conjugative transfer to a common zoonotic pathogen Escherichia coli O157:H7 and underlying mechanisms were explored. Results revealed that bulk hematite reduced the conjugation of resistant plasmids by inhibiting cell growth at any concentration (1-100 mg/L), different ...
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Batch experiments were conducted to investigate adsorption of humic acid (HA) on a commercial hematite. The point of zero charge (PZC) and specific surface area of hematite were 9.17 ± 0.25 and 5.22 ± 0.04 m2 g−1, respectively. The concentrations of HA in solutions were quantified by the ultraviolet–visible spectrophotometer, and molecular weight (MW) was …
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Impact of environmental conditions on aggregation kinetics of hematite and goethite nanoparticles Chen-yang Xu . Kai-ying Deng . Jiu-yu Li . Ren-kou Xu Received: 13 September 2015/Accepted: 24 September 2015/Published online: 3 October 2015 Springer Science+Business Media Dordrecht 2015 Abstract Hematite and goethite nanoparticles were
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This study was carried out to assess the effects of hematite nanoparticles (α-Fe2O3) on the motility and phytoavailability of arsenic in contaminated soils and corn growth. A factorial experiment was conducted using a completely randomized design and three replications. The examined factors were the application rates of hematite nanoparticles (0, 0.05, 0.1 and 0.2%) …
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There has been a growing concern with the environmental influences of nanomaterials due to recent developments in nanotechnology. This study investigates the impact and fate of hematite ...
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The X-ray diffraction patterns of the bulk hematite and nano-hematite were shown in Supporting Information, Fig. S1, indicating that these two hematite particles contained only the hematite phase and had the same composition of α-Fe 2 O 3. Different concentrations of mineral suspensions (0.02, 0.1, 0.5, 1 and 2 g/L) were prepared with a Sonic ...
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NPs-heavy metals interaction might be effected by environmental factors like oxidation/reduction potential (Tandon et al., 2015). The synergistic use of Fe and Si-NPs repressed the lethal effects of Pb in rice seedlings by altering the cellular, metabolic, and morphological traits (Ghouri et al., 2024). We also determined the translocation and ...
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To evaluate the effects of hematite (HMT) on the stabilization of PTEs, 1–5% (by weight) ... This problem is especially serious in developing countries such as China due to the inadequate enforcement of environmental protection laws in the past (Zhao et al., 2015). PTEs can accumulate in the human body through the food chain and then threaten ...
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