Quantitative approach in iron oxides and oxyhydroxides by vibrational analysis

Betancur, A.F.

doi:10.7149/opa.45.3.269

Cited by 28 publications

(14 citation statements)

References 17 publications

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“…Figure 2(f) revealed the vibrational spectra of SH-9B. The spectra revealed the characteristic bands of haematite between 470 and 550 cm −1 and are in agreement with past studies (Betancur et al 2012). The other bands at 946 and 1056 cm −1 are due to symmetric stretching bands of the PO 4 group due to the impurity phase of FAP in it.…”

Section: Haematitesupporting

confidence: 88%

Structural and luminescent characterisation of uraniferous fluorapatite and haematite associated with phosphatic rocks of the Bijawar group in Sagar District, Madhya Pradesh (India)

et al. 2018

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The structural and spectroscopic characteristics of phosphatic ferruginous shale samples from the Bijawar Group rocks from Sagar District of Madhya Pradesh (India) have been probed for identification of uranium species. Fluorapatite (Ca 5 (PO 4) 3 F, FAP) and haematite (α-Fe 2 O 3) were identified as the main phases in the separated mineral concentrates. The photoluminescence (PL) and X-ray absorption near edge spectroscopy (XANES) studies pointed to a strong experimental evidence of both U(IV) and U(VI) oxidation states in the mineral concentrate portion obtained from the same parent host rock. The PL spectrum has confirmed the charge transfer (f-d) transition bands in UV and near-UV regions with emission peaks at ca. 290, 313, 336, 399 and 416 nm, which has been attributed to the substitution of Ca 2+ ions by U(IV) in FAP and broad structureless emission due to stabilisation of U(VI) as UO 6− 6 in haematite. Time-resolved spectroscopy studies have revealed biexponential decay components lasting 2-5 ns for U(IV) species and 10 μs for U(VI) species. These characterisations revealed the fundamental information about the oxidation state and form of uranium in this region. Remediation measures for the Bijawar region are also suggested.

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Section: Haematitesupporting

confidence: 88%

Structural and luminescent characterisation of uraniferous fluorapatite and haematite associated with phosphatic rocks of the Bijawar group in Sagar District, Madhya Pradesh (India)

et al. 2018

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“…The iron-oxygen bond observed at 671 cm −1 , 621 cm −1 and 636 cm −1 (Fig. 6) [13,28,29,[45][46][47][48]. The FTIR bands for the synthesized iron nanoparticles matched well with those for their respective plant extracts, which demonstrate that the components present in the extracts capped the synthesized iron nanoparticles.…”

Section: Ftir Characterization Of Zvinmentioning

confidence: 57%

Catalytic degradation of methylene blue by iron nanoparticles synthesized using Galinsoga parviflora, Conyza bonariensis and Bidens pilosa leaf extracts

et al. 2019

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Green synthesized metallic nanoparticles are environmentally friendly, bio-compatible, and highly stable. The aim of this study was to synthesize iron nanoparticles (FeNPs) from FeCl 3 solution using aqueous leaf extracts of Galinsoga parviflora (Gp), Conyza bonariensis (Cb) and Bidens pilosa (Bp) and use them in degradation of methylene blue dye. The iron nanoparticles were characterized using UV-Vis spectrophotometer, FT-IR spectrophotometer, X-ray Fluorescence (EDXRF), X-ray diffractometer (XRD), and scanning electron microscope (SEM). Phytochemical screening for presence of secondary metabolites revealed presence of phenolics, phytosterols and flavonoids. The total phenolic and flavonoid content in Galinsoga parviflora, Conyza bonariensis and Bidens pilosa leaf extracts were 57.67 ± 1.27, 117.13 ± 0.03, 126.27 ± 0.013 mg Gallic Equivalent/g of Dry Weight (mg GAE/g DW) and 39.00 ± 0.56, 45.50 ± 0.59, 33.13 ± 0.81 mg Rutin Equivalent/g of Dry Weight (mg RE/g DW) respectively. The UV-Vis spectrum of FeCl 3 had a shoulder at 320 nm, which disappeared upon addition of G. parviflora, C. bonariensis and B. pilosa extracts confirming formation of iron nanoparticles. Evaluation of iron content of the synthesized nanoparticles revealed that the iron content in G. parviflora, C. bonariensis and B. pilosa extracts was 51, 47 and 44% respectively. XRD data revealed presence of a large amorphous coating that masked iron peaks, though 2 theta values observed have been reported to be of iron oxides. Methylene blue degradation studies revealed that CbNPs, BpNPs and GpNPs synthesized were good biocatalysts as they degraded the dye by 86, 84.3 and 92% respectively. Therefore, green synthesized iron nanoparticles is cost effective and environmentally safe in providing insight in the environmental removal of dyes.

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“…Even though FTIR systems have been successfully applied for the quantification of several kind of liquid [24,25] and solid [26,27] samples, only a few works describe the use of this spectroscopic technique for the quantification of iron phases [28,29].…”

Section: Introductionmentioning

confidence: 99%

FTIR spectroscopic semi-quantification of iron phases: A new method to evaluate the protection ability index (PAI) of archaeological artefacts corrosion systems

et al. 2018

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This study proposes an innovative approach to semi-quantify the main iron corrosion phases found in corrosion systems of archaeological artefacts. This method is based on the treatment of Fourier Transform Infrared Spectroscopy (FTIR) data using a homemade spectra decomposition software (PALME). Its application was first tested on mixtures of pure iron corrosion standards. After optimization, it was used to study real archaeological samples and evaluate the stability of their corrosion system. Considering that reliable and repetitive results were reached using extremely small quantities of material, this method can be particularly suitable for the study of iron-based objects of cultural interest.

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Quantitative approach in iron oxides and oxyhydroxides by vibrational analysis

Cited by 28 publications

References 17 publications

Structural and luminescent characterisation of uraniferous fluorapatite and haematite associated with phosphatic rocks of the Bijawar group in Sagar District, Madhya Pradesh (India)

Structural and luminescent characterisation of uraniferous fluorapatite and haematite associated with phosphatic rocks of the Bijawar group in Sagar District, Madhya Pradesh (India)

Catalytic degradation of methylene blue by iron nanoparticles synthesized using Galinsoga parviflora, Conyza bonariensis and Bidens pilosa leaf extracts

FTIR spectroscopic semi-quantification of iron phases: A new method to evaluate the protection ability index (PAI) of archaeological artefacts corrosion systems

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