A Raman and infrared spectroscopic characterisation of the phosphate mineral phosphohedyphane Ca2Pb3(PO4)3Cl from the Roote mine, Nevada, USA

Frost, Ray L.; Scholz, Ricardo; López, Andrés; Firmino, Bárbara E.; Lana, Cristiano; Xi, Yunfei

doi:10.1016/j.saa.2014.02.067

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…The FT-IR spectra of materials are presented in Figures a and S3. Enhanced absorbance of hydrogen bonds around 3400 cm –1 and the new absorption originating from the antisymmetric vibration v 3 of phosphate at 900–1250 cm –1 can be found in the FT-IR spectra of H 2 PO 4 – -MIL-100(Fe) and HPO 4 2– -MIL-100(Fe). − The envelope of v 3 exhibits two split peaks at 1005/1076 and 1007/1071 cm –1 . The split peak at 1007(1005) cm –1 can be ascribed to the vibration of P–O–Fe in this study, − which demonstrates that the phosphate is successfully anchored on the MIL-100(Fe) by anion exchange.…”

Section: Results and Analysismentioning

confidence: 97%

Surface Charge Regulation of MIL-100(Fe) by Anion Exchange for Demulsifying the Cationic Surfactant-Stabilized O/W Emulsion

Wang

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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Demulsifying ionic surfactant-stabilized emulsions remains an emerging issue due to the stringent electrostatic barriers. In this work, a phosphate-mediated anion exchange strategy was proposed to fabricate a metal−organic framework, MIL-100(Fe), with adjustable surface charge for effective demulsification toward a cationic surfactant-stabilized emulsion. By adjusting the pH of the phosphate precursor solution, the surface charge of MIL-100(Fe) can be fine-tuned. At pH 3.0, the phosphate-exchanged MIL-100(Fe) with the zeta potential decreasing from 21.4 to 6.1 mV exhibited a significant enhancement of the demulsification efficiency (DE) from 35 to 91%. Further elevating the pH to 9.0 results in the zeta potential of the phosphate-exchanged MIL-100(Fe) to be reversed to −2.0 mV, and the DE can be optimized to 96% within 5 min. The demulsification mechanism was systematically explored based on the zeta potential, distribution of the surfactant, viscoelastic modulus evaluation, and morphological characterization of the emulsion in combination with monitoring of the dynamics process of demulsification. It was found that the phosphate-exchanged MIL-100(Fe) captured by the emulsion can lead to the release of the surfactant and heterogenization of the interfacial film, causing the elasticity of the emulsion to decrease and the irreversible deformation of emulsion droplets. Consequently, the destabilized emulsion could be subjected to the effective demulsification either by the fusion pathway mediated by the phosphate-exchanged MIL-100(Fe) or direct rupture. This work emphasized a facile and promising approach to deal with the cationic surfactant-emulsified oily wastewater and disclosed the fundamental demulsification process.

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Section: Results and Analysismentioning

confidence: 97%

Surface Charge Regulation of MIL-100(Fe) by Anion Exchange for Demulsifying the Cationic Surfactant-Stabilized O/W Emulsion

Wang

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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“…The Raman spectral fingerprints of species within the Ca-apatite, pyromorphite, and phosphohedyphane [44][45][46][47][48] mineral groups indicate their chemical-structural similarities (see Figure 5). The overall spectral patterns clearly differentiate the individual mineral groups from each other (Figure 5, panel A), as would XRD.…”

Section: Phosphate Phasesmentioning

confidence: 99%

Worth a Closer Look: Raman Spectra of Lead-Pipe Scale

et al. 2021

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The identification and characterization of lead-bearing and associated minerals in scales on lead pipes are essential to understanding and predicting the mobilization of lead into drinking water. Despite its long-recognized usefulness in the unambiguous identification of crystalline and amorphous solids, distinguishing between polymorphic phases, and rapid and non-destructive analysis on the micrometer spatial scale, the Raman spectroscopy (RS) technique has been applied only occasionally in the analysis of scales in lead service lines (LSLs). This article illustrates multiple applications of RS not just for the identification of phases, but also compositional and structural characterization of scale materials in harvested lead pipes and experimental pipe-loop/recirculation systems. RS is shown to be a sensitive monitor of these characteristics through analyses on cross-sections of lead pipes, raw interior pipe walls, particulates captured in filters, and scrapings from pipes. RS proves to be especially sensitive to the state of crystallinity of scale phases (important to their solubility) and to the specific chemistry of phases precipitated upon the introduction of orthophosphate to the water system. It can be used effectively alone as well as in conjunction with more standard analytical techniques. By means of fiber-optic probes, RS has potential for in situ, real-time analysis within water-filled pipes.

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“…The mineral pseudolaueite of formula Mn 2 Raman spectroscopy has proven very useful for the study of minerals, especially minerals containing oxyanions such as phosphate [7][8][9][10][11][12][13][14]. This paper is a part of systematic studies of vibrational spectra of minerals of secondary origin in the oxide supergene zone.…”

Section: Introductionmentioning

confidence: 99%

A Raman and Infrared Spectroscopic Study of the Phosphate Mineral Pseudolaueite and in Comparison with Strunzite and Ferrostrunzite

2015

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The Raman spectra of pseudolaueite, strunzite, ferrostrunzite and ferristrunzite have been obtained at 298 K using Raman microscopy. These spectra are compared with their infrared spectra. The vibrational spectra of the four minerals are different, in line with differences in crystal structure and composition. Some similarity in the Raman spectra of the hydroxyl-stretching region exists, particularly but characteristic differences in the OH deformation regions are observed. Differences are also observed in the phosphate stretching and deformation regions. Graphical Abstract This paper offers new knowledge and understanding of the mineral pseudolaueite of formula Mn 2? Fe 2 3? (PO 4 ) 2 (OH) 2 Á8H 2 O,a hydrated hydroxy phosphate of ferric iron and manganese.

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A Raman and infrared spectroscopic characterisation of the phosphate mineral phosphohedyphane Ca2Pb3(PO4)3Cl from the Roote mine, Nevada, USA

Cited by 6 publications

References 22 publications

Surface Charge Regulation of MIL-100(Fe) by Anion Exchange for Demulsifying the Cationic Surfactant-Stabilized O/W Emulsion

Surface Charge Regulation of MIL-100(Fe) by Anion Exchange for Demulsifying the Cationic Surfactant-Stabilized O/W Emulsion

Worth a Closer Look: Raman Spectra of Lead-Pipe Scale

A Raman and Infrared Spectroscopic Study of the Phosphate Mineral Pseudolaueite and in Comparison with Strunzite and Ferrostrunzite

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