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Letteratura scientifica selezionata sul tema "Δ-FeOOH"

Autore: Grafiati

Pubblicato: 21 dicembre 2024

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Articoli di riviste sul tema "Δ-FeOOH"

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. 3 (1 marzo 2021): 1711–20. http://dx.doi.org/10.1166/jnn.2021.19089.

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Abstract (sommario):

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

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Abstract (sommario):

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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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. 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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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. 4 (14 novembre 2023): 523–36. http://dx.doi.org/10.3390/electrochem4040033.

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Abstract (sommario):

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. 3 (9 settembre 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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Jurkin, Tanja, Goran Štefanić, Goran Dražić e Marijan Gotić. "Synthesis route to δ-FeOOH nanodiscs". Materials Letters 173 (giugno 2016): 55–59. http://dx.doi.org/10.1016/j.matlet.2016.03.009.

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

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

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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. 1 (23 dicembre 2018): 8. http://dx.doi.org/10.3390/min9010008.

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Abstract (sommario):

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

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Abstract (sommario):

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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Più fonti

Tesi sul tema "Δ-FeOOH"

Gao, Zhengfeng. "Multifunctional 2D nanomaterials for antibacterial and anticancer applications". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF033.

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L’oxyde de graphène (GO) et le δ-FeOOH, réputés pour leur biocompatibilité, leurs grandes surfaces spécifiques et leur facilité de fonctionnalisation, présentent un potentiel prometteur pour des applications biomédicales, notamment dans la lutte contre les infections bactériennes et le traitement du cancer.Cette thèse a exploré la synthèse, la fonctionnalisation et les applications de ces matériaux bidimensionnels (2D). Le premier projet a consisté à fonctionnaliser le GO avec des peptides antimicrobiens (AMPs) en utilisant la chimie Click pour améliorer son activité antibactérienne, une stratégie utilisant des polymères ramifiés s’étant avérée particulièrement efficace pour améliorer l’activité antibactérienne. Le deuxième projet a tenté d'accroître l’efficacité antibactérienne du GO en liant à sa structure des composés d'ammonium quaternaire (QACs). Cependant, cette approche n’a pas réussi à surpasser l’efficacité des composants individuels. Le troisième projet a exploré l’utilisation du δ-FeOOH et de ses dérivés dans des réactions de type Fenton pour des thérapies potentielles contre le cancer. Globalement, la recherche menée dans cette Thèse souligne la nécessité d'optimiser les stratégies de fonctionnalisation afin d'équilibrer la biocompatibilité et l’efficacité, tout en explorant les capacités des nouveaux matériaux ferreux 2D dans les applications biomédicales
Graphene oxide (GO) and δ-FeOOH, notable for their biocompatibility, high surface area, and ease of functionalization, show promising potential for biomedical applications, specifically in combating bacterial infections and treating cancer.This thesis explored the synthesis, functionalization, and applications of these two-dimensional (2D) materials. The first project concerned functionalizing GO with antimicrobial peptides (AMPs) using the Click chemistry to enhance its antibacterial activity, with one strategy using branched polymers proving to be particularly effective in enhancing the antibacterial efficacy. The second project attempted to improve the antibacterial effectiveness of GO by attaching to its structure quaternary ammonium compounds (QACs). However, this approach failed to exceed the efficacy of the single individual components. The third project explored the use of δ-FeOOH and its derivatives in Fentonlike reactions for potential cancer therapies. Overall, the research explored in this Thesis emphasizes the need to optimize the functionalization strategies to balance the biocompatibility and the efficiency, while also exploring the capabilities of novel iron-based 2D materials in biomedical application

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Capitoli di libri sul tema "Δ-FeOOH"

Ishikawa, T. "Structures of Microporous Hematite Particles Prepared from δ-FeOOH". In Fine Particles Science and Technology, 171–83. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0259-6_13.

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Atti di convegni sul tema "Δ-FeOOH"

Ferreira, Ana Luiza Hilário Kunert, Karoline Santos Nantes e André Santiago Afonso. "CONVERSÃO ELETROQUÍMICA DE NANOPARTÍCULAS DE δ-FeOOH EM NANOPARTÍCULAS DE AZUL DA PRÚSSIA SOBRE ELETRODOS IMPRESSOS DE CARBONO MODIFICADOS COM GRAFENO". In V Congresso Online Nacional de Química. Congresse.me, 2023. http://dx.doi.org/10.54265/navz6665.

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