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Artigos de revistas sobre o tema "Δ-FeOOH"

Autor: Grafiati

Publicado: 21 de dezembro de 2024

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1

Andrade, Thainá Gusmão, Mayra Soares Santos, Luiz Fernando Oliveira Maia, Tamise Emanuele Oliveira de Aquino, Lucas Zeferino da Silva, Vitor Chaves Silva, Márcia Cristina da Silva Faria et al. "Iron Oxide Nanomaterials for the Removal of Cr(VI) and Pb(II) from Contaminated River After Mariana Mining Disaster". Journal of Nanoscience and Nanotechnology 21, n.º 3 (1 de março de 2021): 1711–20. http://dx.doi.org/10.1166/jnn.2021.19089.

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If not properly treated, water contaminated with chromium (Cr(VI)) and lead (Pb(II)) can cause severe damage to health due to the accumulation of those toxic metals in the human body. Therefore, in this work, three iron oxides, i.e., δ-FeOOH, cystine-functionalized δ-FeOOH (Cys-δ-FeOOH), and Fe3O4, were synthesized and used as adsorbents for Cr(VI) and Pb(II) in water. The results indicated that the Cr(VI) is best adsorbed on cys-δ-FeOOH followed by δ-FeOOH and Fe3O4. It was because of the enhanced interaction between Cr(VI) and the cysteine functional groups on the δ-FeOOH surface. The Cr(VI) adsorption capacity of cys-δ-FeOOH, δ-FeOOH, and Fe3O4 was 217, 14, and 8 mg g−1, respectively. On the other hand, Pb(II) was preferentially adsorbed directly on δ-FeOOH achieving a maximum Pb(II) adsorption capacity of 174 mg g−1. The Pb(II) adsorption capacity of cys-δ-FeOOH and Fe3O4 was 97 and 74 mg g−1, respectively. The Cr(VI) adsorption on cys-δ-FeOOH was best described by the Langmuir-Freundlich model, whereas Pb(II) adsorption on δ-FeOOH followed the Langmuir model. Both Cr(VI) and Pb(II) adsorption on the adsorbents was well-fitted to pseudo-second-order kinetics. The Cr(VI) was more quickly adsorbed by cys-δ-FeOOH (h0 = 0.10 mg g−1 min−1) while the initial adsorption rate of Pb(II) onto δ-FeOOH was significantly faster (h0 = 16.34 mg g−1 min−1). Finally, the synthesized adsorbents were efficient to remove Cr(VI) and Pb(II) from water samples of the Doce river after the environmental disaster of Mariana city, Brazil, thus showing its applicability to remediate real water samples.

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2

Lu, Bin, Mei Qin, Ping Li, Shu Ping Wang e Yu Wei. "The Influence Factors on δ-FeOOH Nanosheets Preparation". Materials Science Forum 852 (abril de 2016): 401–6. http://dx.doi.org/10.4028/www.scientific.net/msf.852.401.

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δ-FeOOH nanosheets have been synthesized on a large-scale by a simple method using NH3·H2O as precipitant at pH 10. The samples were characterized by FESEM, XRD, TEM, FTIR and PPMS. The results of this characterization reveal that the complexes [FeIII(OH)n(NH3)m]3−n formed between Fe3+ ions and NH3 favor nucleation and oriented growth of δ-FeOOH nanosheets. The influences of precipitant, the initial pH, and concentration of H2O2 on the structure and morphology of the as-prepared δ-FeOOH have been investigated. Magnetic investigations show that the δ-FeOOH nanosheets exhibit high coercivity.

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3

Wu, Shijiao, Jianwei Lu, Zecong Ding, Na Li, Fenglian Fu e Bing Tang. "Cr(vi) removal by mesoporous FeOOH polymorphs: performance and mechanism". RSC Advances 6, n.º 85 (2016): 82118–30. http://dx.doi.org/10.1039/c6ra14522a.

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The mesoporous FeOOH polymorphs, i.e., goethite (α-FeOOH), akaganeite (β-FeOOH), lepidocrocite (γ-FeOOH), and feroxyhyte (δ-FeOOH) were synthesized and characterized before and after reaction with Cr(vi) using various analytical techniques.

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4

Melo, Wiviane E. R. de, Karoline S. Nantes, Ana L. H. K. Ferreira, Márcio C. Pereira, Luiz H. C. Mattoso, Ronaldo C. Faria e André S. Afonso. "A Disposable Carbon-Based Electrochemical Cell Modified with Carbon Black and Ag/δ-FeOOH for Non-Enzymatic H2O2 Electrochemical Sensing". Electrochem 4, n.º 4 (14 de novembro de 2023): 523–36. http://dx.doi.org/10.3390/electrochem4040033.

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Hydrogen peroxide (H2O2) is an essential analyte for detecting neurodegenerative diseases and inflammatory processes and plays a crucial role in pharmaceuticals, the food industry, and environmental monitoring. However, conventional H2O2 detection methods have drawbacks such as lengthy analysis times, high costs, and bulky equipment. Non-enzymatic sensors have emerged as promising alternatives to overcome these limitations. In this research, we introduce a simple, portable, and cost-effective non-enzymatic sensor that uses carbon black (CB) and silver nanoparticle-modified δ-FeOOH (Ag/δ-FeOOH) integrated into a disposable electrochemical cell (DCell). Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and electrochemical impedance spectroscopy (EIS) confirmed successful CB and Ag/δ-FeOOH immobilization on the DCell working electrode. Electrochemical investigations revealed that the DCell-CB//Ag/δ-FeOOH sensor exhibited an approximately twofold higher apparent heterogeneous electron transfer rate constant than the DCell-Ag/δ-FeOOH sensor, capitalizing on CB’s advantages. Moreover, the sensor displayed an excellent electrochemical response for H2O2 reduction, boasting a low detection limit of 22 µM and a high analytical sensitivity of 214 μA mM−1 cm−2. Notably, the DCell-CB//Ag/δ-FeOOH sensor exhibited outstanding selectivity for H2O2 detection, even in potential interferents such as dopamine, uric acid, and ascorbic acid. Furthermore, the sensor has the right qualities for monitoring H2O2 in complex biological samples, as evidenced by H2O2 recoveries ranging from 92% to 103% in 10% fetal bovine serum. These findings underscore the considerable potential of the DCell-CB//Ag/δ-FeOOH sensor for precise and reliable H2O2 monitoring in various biomedical and environmental applications.

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Nantes, Karoline S., Ana L. H. K. Ferreira, Marcio C. Pereira, Francisco G. E. Nogueira e André S. Afonso. "A Novel Non-Enzymatic Efficient H2O2 Sensor Utilizing δ-FeOOH and Prussian Blue Anchoring on Carbon Felt Electrode". C 10, n.º 3 (9 de setembro de 2024): 82. http://dx.doi.org/10.3390/c10030082.

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In this study, an efficient H2O2 sensor was developed based on electrochemical Prussian blue (PB) synthesized from the acid suspension of δ-FeOOH and K3[Fe(CN)6] using cyclic voltammetry (CV) and anchored on carbon felt (CF), yielding an enhanced CF/PB-FeOOH electrode for sensing of H2O2 in pH-neutral solution. CF/PB-FeOOH electrode construction was proved by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD), and electrochemical properties were verified by impedance electrochemical and CV. The synergy of δ-FeOOH and PB coupled to CF increases electrocatalytic activity toward H2O2, with the sensor showing a linear range of 1.2 to 300 μM and a limit of detection of 0.36 μM. Notably, the CF/PB-FeOOH electrode exhibited excellent selectivity for H2O2 detection in the presence of dopamine (DA), uric acid (UA), and ascorbic acid (AA). The calculated H2O2 recovery rates varied between 93% and 101% in fetal bovine serum diluted in PBS. This work underscores the potential of CF/PB-FeOOH electrodes in progressing electrochemical sensing technologies for various biological and environmental applications.

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6

Jurkin, Tanja, Goran Štefanić, Goran Dražić e Marijan Gotić. "Synthesis route to δ-FeOOH nanodiscs". Materials Letters 173 (junho de 2016): 55–59. http://dx.doi.org/10.1016/j.matlet.2016.03.009.

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7

Gotić, M., S. Popović e S. Musić. "Formation and characterization of δ-FeOOH". Materials Letters 21, n.º 3-4 (novembro de 1994): 289–95. http://dx.doi.org/10.1016/0167-577x(94)90192-9.

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8

Majzlan, Juraj, Christian Bender Koch e Alexandra Navrotsky. "Thermodynamic properties of feroxyhyte (δ′-FeOOH)". Clays and Clay Minerals 56, n.º 5 (1 de outubro de 2008): 526–30. http://dx.doi.org/10.1346/ccmn.2008.0560506.

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9

Ren, Yingzhi, Xiaoming Sun, Yao Guan, Zhenglian Xiao, Ying Liu, Jianlin Liao e Zhengxing Guo. "Distribution of Rare Earth Elements plus Yttrium among Major Mineral Phases of Marine Fe–Mn Crusts from the South China Sea and Western Pacific Ocean: A Comparative Study". Minerals 9, n.º 1 (23 de dezembro de 2018): 8. http://dx.doi.org/10.3390/min9010008.

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Marine hydrogenetic Fe–Mn crusts on seamounts are known as potential mineral resources of rare earth elements plus yttrium (REY). In recent years, increasing numbers of deposits of Fe–Mn crusts and nodules were discovered in the South China Sea (SCS), yet the enrichment mechanism of REY is yet to be sufficiently addressed. In this study, hydrogenetic Fe–Mn crusts from the South China Sea (SCS) and the Western Pacific Ocean (WPO) were comparatively studied with mineralogy and geochemistry. In addition, we used an in situ REY distribution mapping method, implementing laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and a sequential leaching procedure to investigate the partitioning behavior of REY in the Fe–Mn crusts. The typical Fe–Mn crusts from SCS were mainly composed of quartz, calcite, vernadite (δ-MnO2), and amorphous Fe oxides/hydroxides (FeOOH). The Fe–Mn crusts from the Central SCS Basin and the WPO contained quartz, δ-MnO2, FeOOH, todorokite, and phillipsite. Furthermore, geochemical analysis indicated that the typical SCS crusts had a higher growth rate and lower REY concentrations. The LA-ICP-MS mapping results showed that the δ-MnO2 and FeOOH dominated the occurrence phases of REY in the SCS crusts. Four mineral phases (i.e., easily exchangeable and carbonate, Mn-oxide, amorphous FeOOH, and residual aluminosilicates) in these Fe–Mn crusts were separated by a sequential leaching procedure. In the SCS and WPO crusts, the majority of total REY (ΣREY) was distributed in the Mn-oxide and amorphous FeOOH phases. The post-Archean Australian shale-normalized REY patterns showed that light REY (LREY) and heavy REY (HREY) were preferentially adsorbed onto δ-MnO2 and FeOOH, respectively. It is noteworthy that ~27% of ΣREY was associated with the residual aluminosilicates phase of the WPO crusts. The La/Al ratios in the aluminosilicates phase of the typical SCS crusts were the values of the upper crust. We conclude that large amounts of terrigenous materials dilute the abundance of REY in the SCS crusts. In addition, the growth rates of Fe–Mn crusts have a negative correlation with the FeOOH-bound and aluminosilicate-bound REY. As a result of the fast growth rates, the SCS crusts contain relatively low concentrations of REY.

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10

Xu, Chaowen, Masayuki Nishi e Toru Inoue. "Solubility behavior of δ-AlOOH and ε-FeOOH at high pressures". American Mineralogist 104, n.º 10 (1 de outubro de 2019): 1416–20. http://dx.doi.org/10.2138/am-2019-7064.

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Abstract Low-pressure polymorphs of AlOOH and FeOOH are common natural oxyhydroxides at the Earth's surface, which may transport hydrogen to the deep mantle via subduction. At elevated pressures, the low-pressure polymorphs transform into δ-AlOOH and ε-FeOOH with CaCl2-type structure, which form a solid solution above 18 GPa. Nevertheless, few studies have examined the solid solution behavior of this binary system in detail. In this study, we ascertain the phase relations in the AlOOH–FeOOH binary system at 15–25 GPa and 700–1200 °C. X-ray diffraction (XRD) measurements of quenched samples show that δ-AlOOH and ε-FeOOH partly form solid solutions over wide pressure and temperature ranges. Our results demonstrate that a binary eutectic diagram is formed without dehydration or melting below 1200 °C at 20 GPa. We also observe that the maximum solubilities of Al and Fe in the solid solutions are more strongly influenced by temperature than pressure. Our results suggest that the CaCl2-type hydroxides subducted into the deep mantle form a solid solution over a wide composition range. As AlOOH and FeOOH are present in hydrous crust, these phases may be subducted into the deep interior, transporting a significant amount of hydrogen to deeper regions. Therefore, a better understanding of this binary system may help elucidate the model geodynamic processes associated with the deep water cycling in the Earth.

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11

Perng, L. H., I. C. Tung e T. S. Chin. "Synthesis and Properties of Nanocrystalline δ-FeOOH". Le Journal de Physique IV 07, n.º C1 (março de 1997): C1–519—C1–520. http://dx.doi.org/10.1051/jp4:19971211.

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12

Li, Q. X., Z. Y. Wang, W. Han e E. H. Han. "Characterization of the Corrosion Products Formed on Carbon Steel in Qinghai Salt Lake Atmosphere". Corrosion 63, n.º 7 (1 de julho de 2007): 640–47. http://dx.doi.org/10.5006/1.3278414.

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Abstract The corrosion products formed on carbon steel exposed to the Qinghai Salt Lake atmosphere for 12 months was studied using scanning electron microscopy (SEM), electron probe microanalysis (EPMA), x-ray diffraction (XRD), infrared transmission spectroscopy (IRS), and electrochemical techniques. The rust was mainly composed of akaganeite (β-FeOOH), iron hydroxychloride (Fe8[O,OH]16Cl1.3), and a little lepidocrocite (γ-FeOOH). Amorphous δ-FeOOH was only on the downward surface, and the upward surface was corroded more severely than the downward surface. Cl, Mg, and Si foreign elements were rich in the rust. The rust on carbon steel decreased anodic dissolution and increased cathodic current. A low free corrosion potential of the rusted electrode and a very small value of rust resistance (RR) demonstrated that the rust was nonprotective in the Qinghai Salt Lake atmosphere.

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13

Bannai Campos, Paulo, Mariana de Rezende Bonesio, André Dias Lima, Adilson Cândido da Silva, Daiana Teixeira Mancini e Teodorico Castro Ramalho. "Xylose dehydration to furfural using niobium doped δ-FeOOH as catalyst". Journal of the Serbian Chemical Society, n.º 00 (2022): 85. http://dx.doi.org/10.2298/jsc220316085b.

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The effect of modification of ?-FeOOH with niobium, applied to dehydration reaction of xylose, was evaluated by experimentally and theoretically methods. The experimental data confirmed that the materials were obtained by characteristic peaks in the X-ray diffractometer analysis. Inductively coupled plasma mass spectrometry analysis defined the percentage of Nb as 0 for pure ?-FeOOH and 9.5 % w/w (?-FeOOH/Nb) for doped. In relation to obtaining furfural, the doped material presents a conversion improvement of 290 % when compared to pure catalyst. Theoretical calculations were useful in understanding the preferential route of the mechanisms proposed by the obtained potential energy values. To understand the preferred routes, the most favorable position of xylose in relation to ?-FeOOH was initially calculated. From this, the favoring of furfural formation was calculated based on the routes of the proposed mechanisms and the energy values indicated that the furfural formation is more likely by the doped material.

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14

Madsen, Morten Bo, Steen Mørup, Christian J. W. Koch e Ole K. Borggaard. "A study of microcrystals of synthetic feroxyhite (δ'-FeOOH)". Surface Science Letters 156 (junho de 1985): A313. http://dx.doi.org/10.1016/0167-2584(85)90415-3.

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15

Bo Madsen, Morten, Steen Mørup, Christian J. W. Koch e Ole K. Borggaard. "A study of microcrystals of synthetic feroxyhite (δ′FeOOH)". Surface Science 156 (junho de 1985): 328–34. http://dx.doi.org/10.1016/0039-6028(85)90591-6.

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16

Pereira, Márcio César, Eric Marsalha Garcia, Adilson Cândido da Silva, Eudes Lorençon, José Domingos Ardisson, Enver Murad, José Domingos Fabris, Tulio Matencio, Teodorico de Castro Ramalho e Marcus Vinícius J. Rocha. "Nanostructured δ-FeOOH: a novel photocatalyst for water splitting". Journal of Materials Chemistry 21, n.º 28 (2011): 10280. http://dx.doi.org/10.1039/c1jm11736j.

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KRISHNAMURTI, G. S. R., e P. M. HUANG. "THE CATALYTIC ROLE OF BIRNESSITE IN THE TRANSFORMATION OF IRON". Canadian Journal of Soil Science 67, n.º 3 (1 de agosto de 1987): 533–43. http://dx.doi.org/10.4141/cjss87-050.

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The influence of birnessite (δ-MnO2) on the precipitation products of iron was studied, in the FeCl2-NH4OH system at different Mn/Fe molar ratios (0, 0.01, 0.1 and 1.0) and in the acidic pH (4.0, 5.0 and 6.0) range, by X-ray, TEM, IR and chemical analyses. The precipitation products formed at pH 5.0 and 6.0 were found to be lepidocrocite (γ-FeOOH) in the absence of birnessite. Birnessite promoted increased precipitation of Fe oxide; the oxidation of Fe(II) by MnO2 was thermodynamically feasible and was confirmed by the presence of Mn(II) in the solution by ESR data. Birnessite also influenced the crystallization processes of hydrolytic products of Fe which range from lepidocrocite through goethite (α-FeOOH), akaganeite (β-FeOOH), to X-ray noncrystalline Fe oxides. The noncrystalline Fe oxides formed at a Mn/Fe molar ratio of 1.0 were characterized by infrared absorption maxima at 1400 and 750 cm−1. Key words: Birnessite, Fe(II) oxidation, ESR, lepidocrocite, akaganeite, noncrystalline oxide

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18

HAO, S., X. WANG, Y. WEI, Y. WANG e C. LIU. "Preparation and properties of nanosize MnZn ferrite from δ-FeOOH". Rare Metals 25, n.º 6 (outubro de 2006): 466–70. http://dx.doi.org/10.1016/s1001-0521(07)60127-2.

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19

Faria, Márcia C. S., Renedy S. Rosemberg, Cleide A. Bomfeti, Douglas S. Monteiro, Fernando Barbosa, Luiz C. A. Oliveira, Mariandry Rodriguez, Márcio C. Pereira e Jairo L. Rodrigues. "Arsenic removal from contaminated water by ultrafine δ-FeOOH adsorbents". Chemical Engineering Journal 237 (fevereiro de 2014): 47–54. http://dx.doi.org/10.1016/j.cej.2013.10.006.

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20

Nishida, Naoki, Shota Amagasa, Yoshio Kobayashi e Yasuhiro Yamada. "Synthesis of superparamagnetic δ-FeOOH nanoparticles by a chemical method". Applied Surface Science 387 (novembro de 2016): 996–1001. http://dx.doi.org/10.1016/j.apsusc.2016.06.179.

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21

Persoons, R. M., D. G. Chambaere e E. De Grave. "Mössbauer effect study of the magnetic structure in δ-FeOOH". Hyperfine Interactions 28, n.º 1-4 (fevereiro de 1986): 647–50. http://dx.doi.org/10.1007/bf02061531.

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Corrêa, Silviana, Isael Aparecido Rosa, Gustavo A. Andolpho, Letícia Cristina de Assis, Maíra dos S. Pires, Lívia C. T. Lacerda, Francisco G. E. Nogueira et al. "Hybrid Materials Based on Magnetic Iron Oxides with Benzothiazole Derivatives: A Plausible Potential Spectroscopy Probe". International Journal of Molecular Sciences 22, n.º 8 (12 de abril de 2021): 3980. http://dx.doi.org/10.3390/ijms22083980.

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Rare diseases affect a small part of the population, and the most affected are children. Because of the low availability of patients for testing, the pharmaceutical industry cannot develop drugs for the diagnosis of many of these orphan diseases. In this sense, the use of benzothiazole compounds that are highly selective and can act as spectroscopy probes, especially the compound 2-(4′-aminophenyl)benzothiazole (ABT), has been highlighted. This article reports the design of potential contrast agents based on ABT and iron to develop a new material with an efficient mechanism to raise the relaxation rate, facilitating diagnosis. The ABT/δ-FeOOH hybrid material was prepared by grafting (N-(4’-aminophenyl) benzothiazole-2-bromoacetamide) on the surface of the iron oxyhydroxide particles. FTIR spectra confirmed the material formations of the hybrid material ABT/δ-FeOOH. SEM analysis checked the covering of nanoflakes’ surfaces in relation to the morphology of the samples. The theoretical calculations test a better binding mode of compound with iron oxyhydroxide. Theoretical findings show the radical capture mechanism in the stabilization of this new material. In this context, Fe3+ ions are an electron acceptor from the organic phase.

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23

Shinagawa, Tsutomu, Yuya Kanemoto e Atsushi Ohtaka. "Preparation of Oriented Nanoporous Magnetite Films by a Template-Free Solution Process from Iron Oxyhydroxide Films". ECS Meeting Abstracts MA2024-01, n.º 25 (9 de agosto de 2024): 1441. http://dx.doi.org/10.1149/ma2024-01251441mtgabs.

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Nanoporous oxide films composed of nanocrystal assemblies with an aligned crystallographic orientation are key nanostructures for efficient interfacial reactions. However, a simple, template-free method for their formation remains a challenge. Layered metal hydroxide (LMH) films are a promising precursor for spontaneous formation of nanoporous oxide films.[1-4] LMHs have a layered structure comprising 2D sheets of edge-shared octahedral hydroxide, i.e., brucite structure, with or without interlayer anions and water molecules. Calcination of LMH results in dehydration, anion elimination, and volume shrinkage, leading to the spontaneous formation of nanoporous oxides. In this study, we have prepared nanoporous and ferrimagnetic magnetite (Fe3O4) films by using layered iron hydroxides, namely, green rust (GR), as a precursor. Generally, GR has a brucite-type structure containing Fe2+ and Fe3+ ions, and is highly susceptible to oxidation by oxygen in water and air, leading to the formation of iron oxyhydroxides (FeOOH). Here, GR films were electrochemically deposited on FTO substrates in an aqueous solution containing Fe2+ and NO3 − ions at room temperature. Drying the GR films in air resulted in the formation of two-type FeOOH films, depending on the electrodeposition condition. Characterization using X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and FT-IR spectroscopy revealed that one is [010]-oriented γ-FeOOH films, and the other is [001]-oriented δ-FeOOH films. The obtained FeOOH films had a mille-feuille like morphology with 500–700 nm thickness. Heat treatment of these two-type FeOOH films under vacuum at 500 °C resulted in the formation of [110]- and [111]-oriented nanoporous Fe3O4 films. The obtained Fe3O4 films showed a ferrimagnetic behavior in VSM measurements and had a nanoporous structure comprising nanoparticles with 50–100 nm diameter. Finally, a possilble interpretation for the observed orientation relationships between the FeOOH and Fe3O4 was also discussed on the basis of pyrolysis intermediates of FeOOH and similarity in their atomic arrangements. References T. Shinagawa, M. Watanabe, T. Mori, J.-i. Tani, M. Chigane and M. Izaki, Inorg. Chem., 57, 13137 (2018). T. Shinagawa, M. Chigane and M. Izaki, ACS Omega, 6, 2312 (2021). T. Shinagawa, M. Chigane and M. Takahashi, Cryst. Growth Des., 22, 4122 (2022). T. Shinagawa, N. Kotobuki and A. Ohtaka, Nanoscale Adv., 5, 96 (2023). Figure 1

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Dzeranov, Artur, Lyubov Bondarenko, Denis Pankratov, Mikhail Prokof‘ev, Gulzhian Dzhardimalieva, Sharipa Jorobekova, Nataliya Tropskaya, Ludmila Telegina e Kamila Kydralieva. "Iron Oxides Nanoparticles as Components of Ferroptosis-Inducing Systems: Screening of Potential Candidates". Magnetochemistry 9, n.º 1 (23 de dezembro de 2022): 3. http://dx.doi.org/10.3390/magnetochemistry9010003.

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This study presents an analysis of a set of iron oxides nanoparticles (NPs) (γ-Fe2O3, α-FeOOH, δ-FeOOH, 5Fe2O3·9H2O, and Fe3O4) as potential candidates for ferroptosis therapy in terms of a phase state, magnetic characteristics, and the release of Fe2+/Fe3+ as ROS mediators. Due to the values of saturation magnetization for Fe3O4 (31.6 emu/g) and γ-Fe2O3 (33.8 emu/g), as well as the surface area of these particles (130 and 123 m2/g), it is possible to consider them as promising magnetically controlled carriers that can function with various ligands. The evaluation of the release of Fe2+/Fe3+ ions as catalysts for the Fenton reaction showed that the concentration of the released ions increases within first 3 h after suspension and decreases within 24 h, which probably indicates desorption and adsorption of ions from/onto the surface of nanoparticles regardless their nature. The concentration of ions released by all nanoparticles, except α-FeOOH-Fe2+, reached 9.1 mg/L for Fe3+ to 1.7 mg/L for Fe2+, which makes them preferable for controlling the catalysis of the Fenton reaction. In contrast, a high concentration of iron ions to 90 mg/L for Fe3+ and 316 mg/L for Fe2+ released from compound α-FeOOH-Fe2+ allows us to utilize this oxide as an aid therapy agent. Results obtained on iron oxide nanoparticles will provide data for the most prospective candidates that are used in ferroptosis-inducing systems.

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Szytuła, A., B. Penc e E. Stec-Kuźniar. "Crystal Structure of Synthetic Feroxyhite δ-FeOOH Studied with Neutron Diffraction". Acta Physica Polonica A 142, n.º 2 (agosto de 2022): 306–8. http://dx.doi.org/10.12693/aphyspola.142.306.

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Ishikawa, Tatsuo, Akemi Yasukawa, Kazuhiko Kandori e Ryuji Orii. "Textures of tetradecahedron δ-FeOOH particles and their thermal decomposition products". J. Chem. Soc., Faraday Trans. 90, n.º 17 (1994): 2567–71. http://dx.doi.org/10.1039/ft9949002567.

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Kaneko, K., e K. Inouye. "The NO Chemisorption Activity of δ-FeOOH Having Different Magnetic Properties". Adsorption Science & Technology 3, n.º 1 (março de 1986): 11–18. http://dx.doi.org/10.1177/026361748600300103.

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Zhang, Zonghuai, Beibei He, Liangjian Chen, Huanwen Wang, Rui Wang, Ling Zhao e Yansheng Gong. "Boosting Overall Water Splitting via FeOOH Nanoflake-Decorated PrBa0.5Sr0.5Co2O5+δ Nanorods". ACS Applied Materials & Interfaces 10, n.º 44 (15 de outubro de 2018): 38032–41. http://dx.doi.org/10.1021/acsami.8b12372.

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Zhang, Li, Hongsheng Yuan, Yue Meng e Ho-kwang Mao. "Discovery of a hexagonal ultradense hydrous phase in (Fe,Al)OOH". Proceedings of the National Academy of Sciences 115, n.º 12 (5 de março de 2018): 2908–11. http://dx.doi.org/10.1073/pnas.1720510115.

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A deep lower-mantle (DLM) water reservoir depends on availability of hydrous minerals which can store and transport water into the DLM without dehydration. Recent discoveries found hydrous phases AlOOH (Z = 2) with a CaCl2-type structure and FeOOH (Z = 4) with a cubic pyrite-type structure stable under the high-pressure–temperature (P-T) conditions of the DLM. Our experiments at 107–136 GPa and 2,400 K have further demonstrated that (Fe,Al)OOH is stabilized in a hexagonal lattice. By combining powder X-ray-diffraction techniques with multigrain indexation, we are able to determine this hexagonal hydrous phase with a = 10.5803(6) Å and c = 2.5897(3) Å at 110 GPa. Hexagonal (Fe,Al)OOH can transform to the cubic pyrite structure at low T with the same density. The hexagonal phase can be formed when δ-AlOOH incorporates FeOOH produced by reaction between water and Fe, which may store a substantial quantity of water in the DLM.

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Tavares, Tássia Silva, Eduardo Pereira da Rocha, Francisco Guilherme Esteves Nogueira, Juliana Arriel Torres, Maria Cristina Silva, Kamil Kuca e Teodorico C. Ramalho. "Δ-FeOOH as Support for Immobilization Peroxidase: Optimization via a Chemometric Approach". Molecules 25, n.º 2 (8 de janeiro de 2020): 259. http://dx.doi.org/10.3390/molecules25020259.

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Owing to their high surface area, stability, and functional groups on the surface, iron oxide hydroxide nanoparticles have attracted attention as enzymatic support. In this work, a chemometric approach was performed, aiming at the optimization of the horseradish peroxidase (HRP) immobilization process on Δ-FeOOH nanoparticles (NPs). The enzyme/NPs ratio (X1), pH (X2), temperature (X3), and time (X4) were the independent variables analyzed, and immobilized enzyme activity was the response variable (Y). The effects of the factors were studied using a factorial design at two levels (−1 and 1). The biocatalyst obtained was evaluated for the ferulic acid (FA) removal, a pollutant model. The materials were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The SEM images indicated changes in material morphology. The independent variables X1 (−0.57), X2 (0.71), and X4 (0.42) presented the significance effects estimate. The variable combinations resulted in two significance effects estimates, X1*X2 (−0.57) and X2*X4 (0.39). The immobilized HRP by optimized conditions (X1 = 1/63 (enzyme/NPs ratio, X2 = pH 8, X4 = 60 °C, and 30 min) showed high efficiency for FA oxidation (82%).

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Zhao, Ziqi, Fuxi Bao, Jiawen Wang, Zongli Gu, Yanbing Huang, Chaocao Cao, Yidan Yuan, Changhong Sun e Wen Guo. "Construction of δ-FeOOH/NiMn2S4 heterointerface for efficient alkaline oxygen evolution reaction". Fuel 384 (março de 2025): 133980. https://doi.org/10.1016/j.fuel.2024.133980.

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Corrêa, Silviana, Lívia C. T. Lacerda, Maíra dos S. Pires, Marcus V. J. Rocha, Francisco G. E. Nogueira, Adilson C. da Silva, Marcio C. Pereira, Angela D. B. de Brito, Elaine F. F. da Cunha e Teodorico C. Ramalho. "Synthesis, Structural Characterization, and Thermal Properties of the Poly(methylmethacrylate)/δ-FeOOH Hybrid Material: An Experimental and Theoretical Study". Journal of Nanomaterials 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/2462135.

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Theδ-FeOOH/PMMA nanocomposites with 0.5 and 2.5 wt.% ofδ-FeOOH were prepared by grafting 3-(trimethoxysilyl)propyl methacrylate on the surface of the iron oxyhydroxide particles. The FTIR spectra of theδ-FeOOH/PMMA nanocomposites showed that the silane monomers were covalently attached to theδ-FeOOH particles. Because of the strong interaction between the PMMA andδ-FeOOH nanoparticles, the thermal stability of theδ-FeOOH/PMMA nanocomposites was improved compared to the pure PMMA. The SEM analysis conferred the size agglomerate of particles regarding the morphology of samples. The theoretical study enabled a better understanding of the interaction of the polymer with the iron oxyhydroxide. The DFT-based calculations reinforce the radical trapping mechanism of stabilization of nanocomposites; that is, Fe3+species might be able to accept electrons coming from the organic phase that decomposes via radical unzipping. The radical scavenge effect delays the weight loss of polymer.

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Huang, Sucheng, e Yazhou Fu. "Enrichment Characteristics and Mechanisms of Critical Metals in Marine Fe-Mn Crusts and Nodules: A Review". Minerals 13, n.º 12 (9 de dezembro de 2023): 1532. http://dx.doi.org/10.3390/min13121532.

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Marine Co-rich ferromanganese crusts and polymetallic nodules, which are widely distributed in oceanic environments, are salient potential mineral resources that are enriched with many critical metals. Many investigations have achieved essential progress and findings regarding critical metal enrichment in Fe-Mn crusts and nodules. This study systematically reviews the research findings of previous investigations and elaborates in detail on the enrichment characteristics, enrichment processes and mechanisms and the influencing factors of the critical metals enriched in Fe-Mn crusts and nodules. The influencing factors of critical metal enrichments in Fe-Mn crusts and nodules mainly include the growth rate, water depth, post-depositional phosphatization and structural uptake of adsorbents. The major enrichment pathways of critical metals in marine Fe-Mn (oxy)hydroxides are primarily as follows: direct substitution on the surface of δ-MnO2 for Ni, Cu, Zn and Li; oxidative substitution on the δ-MnO2 surface for Co, Ce and Tl; partition between Mn and Fe phases through surface complexation according to electro-species attractiveness for REY (except for Ce), Cd, Mo, W and V; combined Mn-Fe phases enrichment for seawater anionic Te, Pt, As and Sb, whose low-valence species are mostly oxidatively enriched on δ-MnO2, in addition to electro-chemical adsorption onto FeOOH, while high-valence species are likely structurally incorporated by amorphous FeOOH; and dominant sorption and incorporation by amorphous FeOOH for Ti and Se. The coordination preferences of critical metals in the layered and tunneled Mn oxides are primarily as follows: metal incorporations in the layer/tunnel-wall for Co, Ni and Cu; triple-corner-sharing configurations above the structural vacancy for Co, Ni, Cu, Zn and Tl; double-corner-sharing configurations for As, Sb, Mo, W, V and Te; edge-sharing configurations at the layer rims for corner-sharing metals when they are less competitive in taking up the corner-sharing position or under less oxidizing conditions when the metals are less feasible for reactions with layer vacancy; and hydrated interlayer or tunnel-center sorption for Ni, Cu, Zn, Cd, Tl and Li. The major ore-forming elements (e.g., Co, Ni, Cu and Zn), rare earth elements and yttrium, platinum-group elements, dispersed elements (e.g., Te, Tl, Se and Cd) and other enriched critical metals (e.g., Li, Ti and Mo) in polymetallic nodules and Co-rich Fe-Mn crusts of different geneses have unique and varied enrichment characteristics, metal occurrence states, enrichment processes and enrichment mechanisms. This review helps to deepen the understanding of the geochemical behaviors of critical metals in oceanic environments, and it also bears significance for understanding the extreme enrichment and mineralization of deep-sea critical metals.

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Li, Jiajia, Yan Ding, Kaiyi Chen, Zhuoning Li, Huijuan Yang, Shijun Yue, Yuping Tang e Qizhao Wang. "δ-FeOOH coupled BiOBr0.5I0.5 for efficient photocatalysis-Fenton synergistic degradation of organic pollutants". Journal of Alloys and Compounds 903 (maio de 2022): 163795. http://dx.doi.org/10.1016/j.jallcom.2022.163795.

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da Silva, Adilson Candido, Monique Rocha Almeida, Mariandry Rodriguez, Alan Rodrigues Teixeira Machado, Luiz Carlos Alves de Oliveira e Márcio César Pereira. "Improved photocatalytic activity of δ-FeOOH by using H2O2 as an electron acceptor". Journal of Photochemistry and Photobiology A: Chemistry 332 (janeiro de 2017): 54–59. http://dx.doi.org/10.1016/j.jphotochem.2016.08.013.

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Liu, Hui, Hui Guo, Ping Li e Yu Wei. "Transformation from δ-FeOOH to hematite in the presence of trace Fe(II)". Journal of Physics and Chemistry of Solids 70, n.º 1 (janeiro de 2009): 186–91. http://dx.doi.org/10.1016/j.jpcs.2008.10.001.

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Zhang, Huixuan, Jinning Wang, Xinyi Zhang, Bo Li e Xiuwen Cheng. "Enhanced removal of lomefloxacin based on peroxymonosulfate activation by Co3O4/δ-FeOOH composite". Chemical Engineering Journal 369 (agosto de 2019): 834–44. http://dx.doi.org/10.1016/j.cej.2019.03.132.

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Zhao, Jiaqi, Li-Zhu Wu e Tierui Zhang. "Identifying the active phase derived from δ-FeOOH for photo-driven CO2 hydrogenation". Chem Catalysis 4, n.º 6 (junho de 2024): 101033. http://dx.doi.org/10.1016/j.checat.2024.101033.

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Gonçalves, Mateus Aquino, e Teodorico Castro Ramalho. "Relaxation parameters of water molecules coordinated with Gd(III) complexes and hybrid materials based on δ-FeOOH (100) nanoparticles: A theoretical study of hyperfine inter-actions for CAs in MRI". Eclética Química Journal 45, n.º 4 (1 de outubro de 2020): 12–20. http://dx.doi.org/10.26850/1678-4618eqj.v45.4.2020.p12-20.

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Cancer is a serious disease that afflicts and worries much of the population, which significantly affects all ages and socio-economic groups and one reason is the great difficulty of the initial diagnostic phase. Thus, magnetic resonance imaging (MRI) is an effective technique for detecting cancer (especially breast cancer), however, for a better visualization of the tissues it is necessary to use the Contrast Agents (CAs), which are paramagnetic compounds capable of increasing the longitudinal and transverse relaxation times (T1 and T2) of water molecules. The CAs are important to increase the rate of relaxation of water protons, the most commonly used CAs are Gd3+ complexes. Thus, in this work we propose two new hybridizing contrast agent, d-FeOOH(100).[Gd(DTPA)(H2O)]2- and δ-FeOOH (100).[Gd(DTPA-BMA)(H2O)], both compounds are capable of increasing both relaxation times T1 and T2. Theoretical results show that the hybrid compound considerably increases the hyperfine coupling constants 1H and 17O of water molecules. In this way, our results show that both hybrid compounds can be used as new contrast agents, thus replacing Gd3+ complexes.

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Ji, Xuefeng, Chuanqi Cheng, Zehao Zang, Lanlan Li, Xiang Li, Yahui Cheng, Xiaojing Yang et al. "Ultrathin and porous δ-FeOOH modified Ni3S2 3D heterostructure nanosheets with excellent alkaline overall water splitting performance". Journal of Materials Chemistry A 8, n.º 40 (2020): 21199–207. http://dx.doi.org/10.1039/d0ta07676g.

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Ohira, Itaru, Jennifer M. Jackson, Natalia V. Solomatova, Wolfgang Sturhahn, Gregory J. Finkelstein, Seiji Kamada, Takaaki Kawazoe et al. "Compressional behavior and spin state of δ-(Al,Fe)OOH at high pressures". American Mineralogist 104, n.º 9 (1 de setembro de 2019): 1273–84. http://dx.doi.org/10.2138/am-2019-6913.

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Abstract Hydrogen transport from the surface to the deep interior and distribution in the mantle are important in the evolution and dynamics of the Earth. An aluminum oxy-hydroxide, δ-AlOOH, might influence hydrogen transport in the deep mantle because of its high stability extending to lower mantle conditions. The compressional behavior and spin states of δ-(Al,Fe3+)OOH phases were investigated with synchrotron X-ray diffraction and Mössbauer spectroscopy under high pressure and room temperature. Pressure-volume (P-V) profiles of the δ-(Al0.908(9)57Fe0.045(1))OOH1.14(3) [Fe/(Al+Fe) = 0.047(10), δ-Fe5] and the δ-(Al0.832(5)57Fe0.117(1))OOH1.15(3) [Fe/(Al+Fe) = 0.123(2), δ-Fe12] show that these hydrous phases undergo two distinct structural transitions involving changes in hydrogen bonding environments and a high- to low-spin crossover in Fe3+. A change of axial compressibility accompanied by a transition from an ordered (P21nm) to disordered hydrogen bond (Pnnm) occurs near 10 GPa for both δ-Fe5 and δ-Fe12 samples. Through this transition, the crystallographic a and b axes become stiffer, whereas the c axis does not show such a change, as observed in pure δ-AlOOH. A volume collapse due to a transition from high- to low-spin states in the Fe3+ ions is complete below 32–40 GPa in δ-Fe5 and δ-Fe12, which i ~10 GPa lower than that reported for pure ε-FeOOH. Evaluation of the Mössbauer spectra of δ-(Al0.824(10)57Fe0.126(4))OOH1.15(4) [Fe/(Al+Fe) = 0.133(3), δ-Fe13] also indicate a spin transition between 32–45 GPa. Phases in the δ-(Al,Fe)OOH solid solution with similar iron concentrations as those studied here could cause an anomalously high ρ/νΦ ratio (bulk sound velocity, defined as K/ρ at depths corresponding to the spin crossover region (~900 to ~1000 km depth), whereas outside the spin crossover region a low ρ/νΦ anomaly would be expected. These results suggest that the δ-(Al,Fe)OOH solid solution may play an important role in understanding the heterogeneous structure of the deep Earth.

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Polyakov, A. Yu, A. E. Goldt, T. A. Sorkina, I. V. Perminova, D. A. Pankratov, E. A. Goodilin e Y. D. Tretyakov. "Constrained growth of anisotropic magnetic δ-FeOOH nanoparticles in the presence of humic substances". CrystEngComm 14, n.º 23 (2012): 8097. http://dx.doi.org/10.1039/c2ce25886b.

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Jiménez-Mateos, Juan M., Julian Morales e JoséL Tirado. "Textural evolution of α-Fe2O3 obtained by thermal and mechanochemical decomposition of δ-FeOOH". Journal of Colloid and Interface Science 122, n.º 2 (abril de 1988): 507–13. http://dx.doi.org/10.1016/0021-9797(88)90385-2.

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Tsung-Shune, Chin, Deng Ming-Cheng e Hsu Sung-Lin. "Hexaferrite particles prepared by a novel flux method with δ-FeOOH as a precursor". Materials Chemistry and Physics 37, n.º 1 (fevereiro de 1994): 45–51. http://dx.doi.org/10.1016/0254-0584(94)90069-8.

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Samchenko, Dmitry, Gennadii Kochetov, Yuliia Trach, Denys Chernyshev e Andriy Kravchuk. "Influence of Technological Factors on the Formation and Transformation of Iron-Containing Phases in the Process of Ferritization of Exhausted Etching Solutions". Water 16, n.º 8 (10 de abril de 2024): 1085. http://dx.doi.org/10.3390/w16081085.

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Every year, metallurgical enterprises generate a massive amount of toxic exhausted high-concentration etching solutions. Application of the ferritization process to recycle exhausted etching solutions can help to prevent environmental pollution. It enables a cost-efficient use of water at an industrial plant and allows the plant to obtain products from toxic industrial waste and utilize it. The aim of the study was to analyze the qualitative and quantitative composition of the formed sediment and its grain size composition. Variable study parameters were the initial pH values of the solutions, the initial concentrations of total iron, and the duration of the aeration process of the reaction mixture. Thermal activation and alternating magnetic fields were used to activate the ferritization. The XRD showed that the formed sediments contained phases of γ-FeOOH, δ-FeOOH, Fe3O4, and γ-Fe2O3. Granulometry analysis showed that these sediments were highly dispersed and heterogeneous. Chemically stable phases of magnetite were obtained in the composition of sediments, with an initial concentration of iron in the reaction mixture of 16.6 g/dm3, a pH of 11.5, and a process duration of 15 min. The study results demonstrated the feasibility of further study and possible use of such sediments with a high magnetite content for the production of materials with ferromagnetic and sorption properties.

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Salari, Marjan, Gholam Reza Rakhshandehroo, Mohammad Reza Nikoo, Mohammad Mahdi Zerafat e Mehrdad Ghorbani Mooselu. "Optimal degradation of Ciprofloxacin in a heterogeneous Fenton-like process using (δ-FeOOH)/MWCNTs nanocomposite". Environmental Technology & Innovation 23 (agosto de 2021): 101625. http://dx.doi.org/10.1016/j.eti.2021.101625.

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HU, J., I. LO e G. CHEN. "Performance and mechanism of chromate (VI) adsorption by δ-FeOOH-coated maghemite (γ-Fe2O3) nanoparticles". Separation and Purification Technology 58, n.º 1 (1 de dezembro de 2007): 76–82. http://dx.doi.org/10.1016/j.seppur.2007.07.023.

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Pinto, Izabela S. X., Pedro H. V. V. Pacheco, Jakelyne Viana Coelho, Eudes Lorençon, José D. Ardisson, José D. Fabris, Patterson P. de Souza, Klaus W. H. Krambrock, Luiz C. A. Oliveira e Márcio C. Pereira. "Nanostructured δ-FeOOH: An efficient Fenton-like catalyst for the oxidation of organics in water". Applied Catalysis B: Environmental 119-120 (maio de 2012): 175–82. http://dx.doi.org/10.1016/j.apcatb.2012.02.026.

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Zhou, Yuerong, Shengwen Zhou, Ming Yi, Yunhe Li, Jiangwei Shang e Xiuwen Cheng. "Enhanced peroxymonosulfate activation for organic decontamination by Ni-doped δ-FeOOH under visible-light assistance". Environmental Research 265 (janeiro de 2025): 120472. http://dx.doi.org/10.1016/j.envres.2024.120472.

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Ishikawa, Tatsuo, Wei Yan Cai e Kazuhiko Kandori. "Characterization of the thermal decomposition products of δ-FeOOH by Fourier-transform infrared spectroscopy and N2adsorption". J. Chem. Soc., Faraday Trans. 88, n.º 8 (1992): 1173–77. http://dx.doi.org/10.1039/ft9928801173.

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