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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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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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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Hematite and goethite nanoparticles were used as model minerals to investigate their aggregation kinetics under soil environmental conditions in the present study. The …
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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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1 Department of Civil and Environmental Engineering, University of Nevada, Reno, ... The long-term microbial reduction extent and initial reduction rate of hematite were accelerated by more than 2-fold in the presence of 10 mg L(-1) biochar. ... In addition to electron shuttling effects, biochar particles sorbed 0.5-1.5 mM biogenic Fe(II) and ...
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a Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, College of Chemistry, Central China Normal University, ... and shed light on the environmental effects of hematite on the …
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Nano-sized hematite (α-Fe 2 O 3) is not well suited for magnetic heating via an alternating magnetic field (AMF) because it is not superparamagnetic—at its best, it is weakly ferromagnetic.However, manipulating the magnetic properties of nano-sized hematite (i.e., magnetic saturation (Ms), magnetic remanence (Mr), and coercivity (Hc)) can make them …
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Hematite is abundant on the Earth's surface and plays a key role in phosphorus cycle. In particular, hematite nanoparticles may adsorb organic or inorganic phosphorus, consequently affecting phosphorus fate and effects. Yet, how the intrinsic properties of hematite (e.g., crystal facet) affect its adsorption process of phosphorus remains unclear.
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Hematite nanocrystals are ubiquitous in natural environments, and because of their strong sorption properties these particles can influence the mobility and fate of toxic elements …
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Microbial reduction of hematite: effects of particle size and exopolysaccharides ... Alfred M. Spormann2, Gordon E. Brown, Jr.1,4 1. Department of Geological and Environmental Sciences, Stanford University, 450 Serra Mall, Building 320, Stanford, California, 94305-2115, USA; ... hematite nanoparticles (avg. diameter = 10nm, surface area (SA ...
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In this study, humic substance (humic acid, HA) and protein (bovine serum albumin, BSA) were chosen as typical natural organic matter (NOM) to reveal the effects of NOM types and concentrations on ...
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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 …
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We emphasize the reductive dissolution of hematite facets and elucidate corresponding environmental implications. Furthermore, we focus on facet-dependent adsorption of model environmental contaminants.
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These findings clarified the dependence of organic arsenic adsorption on the hematite facets, and shed light on the environmental effects of hematite on the migration of PhAs. View.
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Additionally, we identify substantial bias in simulating hematite abundance in dust aerosols with current soil mineralogy descriptions, underscoring the necessity for improved data sources. Encouragingly, the next-generation imaging spectroscopy remote sensing data hold promise for capturing the spatial variability of hematite.
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Over the past decades, hematite has been recognized as a significant active component in soils which inevitably affects the geochemical behaviors of environmental elements, such as the adsorption behavior for heavy metal ions (HMIs) (Dai et al., 2016; Noerpel et al., 2016; Wang et al., 2019a; Jiang et al., 2020; Liang et al., 2021b).As the widespread environmental …
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Due to its high surface area and paramagnetic properties, nano-hematite is also commonly applied in wastewater treatment (Ibrahim et al., 2020). Given the current mass production and widely use of these nanomaterials, the environmental concentration of nano-hematite is expected to continuously increase (Suman et al., 2019).
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ZOU Xuqing, HAO Qingju, ZHAO Maosen, CHEN Shijie, ZHAO Zhongjing, XIONG Weixia, ZENG Wei, JIANG Changsheng. Effects of hematite and biochar addition on sewage treatment and greenhouse gases emissions in subsurface flow constructed wetland[J]. Chinese Journal of Environmental Engineering, 2021, 15(2): 588-598. doi: 10.12030/j.cjee.202005025
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The modification effects of hematite with aluminum hydroxide were investigated on the removal of fluoride ions from water using batch experiments. The effects of pH, contact time, fluoride concentration, and the dose of sorbent on the sorption of fluoride ions by a modified hematite were studied. Characterization of hematite before and after the modification with aluminum …
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Effects of environmental impact. The main effects of human impact on the environment are: Biodiversity loss. The extinction of animal species and the deforestation of native forests are among the main consequences of human impact on the environment. The destruction of ecosystems has harmful effects not only on the natural environment but also ...
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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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The Present review systematically describes how the formation conditions impact the structural and surface properties of hematite particles, thereby providing new strategies for enhancing …
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Oolitic hematite ore, which has a special concentric and layered oolitic texture as well as high phosphorus content (0.4–1.8%), is regarded as one of the most refractory iron ore resources (Li et a...
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This study investigated the influence of multiple colloids (hematite and humic acid) on the transport and deposition of bacteria (Escherichia coli) in packed porous media in both NaCl (5 mM) and CaCl 2 (1 mM) solutions at pH 6.Due to the alteration of cell physicochemical properties, the presence of hematite and humic acid in cell suspensions significantly affected …
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Submicron-sized iron oxide particles can influence the activity of bacteria, but the exact mechanisms of oxide toxicity toward bacteria remain elusive. By using atomic force microscopy (AFM), soft X-ray tomography (Nano-CT), and Fourier transform infrared (FTIR) spectrometry, we show how the size-dependent interfacial interactions between hematite …
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DOI: 10.1016/j.envpol.2020.115391 Corpus ID: 221239315; Uptake, translocation, and physiological effects of hematite (α-Fe2O3) nanoparticles in barley (Hordeum vulgare L.). @article{Tombuloglu2020UptakeTA, title={Uptake, translocation, and physiological effects of hematite ($alpha$-Fe2O3) nanoparticles in barley (Hordeum vulgare L.).}, author={Huseyin …
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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 simulate naturally ...
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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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In this study, humic substance (humic acid, HA) and protein (bovine serum albumin, BSA) were chosen as typical natural organic matter (NOM) to reveal the effects of NOM types and concentrations on ...
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