Preparation and characterization of phosphate glasses containing titanium and vanadium

Kaoua, Sid Ali; Krimi, S.; Jazouli, A. El; Hlil, E.K.; Waal, D. de

doi:10.1016/j.jallcom.2006.04.004

Cited by 21 publications

(17 citation statements)

References 12 publications

(11 reference statements)

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“…The peaks observed at 1300 cm −1 and 1600 cm −1 in all the three samples claims the formation of Fe 2 O 3 in the zeolite structure [54,55]. In the region of 1250 and 1350 cm −1 , it showed symmetric stretching of P−O [53]. The change in peak's intensity in the region of 1300 cm −1 of P-adsorbed and P-desorbed Z-A is due to the formation of Fe−O−P bond.…”

Section: Raman Analysismentioning

confidence: 68%

“…The bands between 650 and 750 cm −1 are due to the presence of a double four rings (D4R) of Z-A [52]. The bands at 800−900 cm −1 , 500 cm −1 regions, and 1250−1350 cm −1 region show P−O−P bridges, bending vibrations of P−O bonds, and P=O stretching respectively [53], where the intensity of band increases at 800−900 cm −1 and decreases at 1300 cm −1 with the increase in phosphate content. The peaks observed at 1300 cm −1 and 1600 cm −1 in all the three samples claims the formation of Fe 2 O 3 in the zeolite structure [54,55].…”

Section: Raman Analysismentioning

confidence: 99%

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Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

et al. 2019

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Iron was incorporated into an LTA type zeolite using the sol-gel hydrothermal method to form Iron-zeolite-A (Iron-Z-A), and its phosphate adsorption-desorption efficiency were analyzed. Samples were characterized by EDS, SEM, XRD, EPR, FT-IR XPS, and Raman to ensure the apt synthesis of Iron-Z-A and to interpret the mechanism of adsorption-desorption of PO43− in an aqueous solution. EPR and XPS analysis confirmed that the iron was doped as Fe3+ in the LTA structure. The XPS peak shift (Fe-2p), FT-IR band shift, and intensity change (–OH) confirmed the existence of the ligand exchange mechanism. In the adsorption phase at pH 5, the derivative of phosphate (H2PO4−) acts as a ligand and interacts with OH of Fe on the zeolite surface to form “Iron-zeolite (oxy) hydroxide bound phosphate”. In the desorption phase at pH 10, phosphate ligand is detached and get mixed in the aqueous phase as HPO42−. The EDS data, Si–O–Al band shift and intensity change in FT-IR and XPS peak intensity change proved the contribution of Al in the process of adsorption. The data of adsorption fitted well with the Langmuir’s isotherm and pseudo-second-order kinetic model. The amount of PO43− adsorbed was a function of adsorbent’s surface area regardless of concentration. The amount of PO43− being adsorbed by the metal ions was found to be 382.296 mg PO43−/g Fe and 56.296 mg PO43−/g Al.

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Section: Raman Analysismentioning

confidence: 68%

Section: Raman Analysismentioning

confidence: 99%

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

et al. 2019

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“…Figure 4 shows the DTA curve, as well as the value of T g of this glass. [8] Table 1 shows a comparison between the values of T g obtained by the three methods described in this work.…”

Section: Resultsmentioning

confidence: 99%

“…[7] The aim of this work is to describe some techniques at higher temperatures necessary to evaluate the dielectric constant 1 0 of phosphate glasses containing some flux oxides (Li 2 O and Na 2 O), at temperatures ranging from 258C to 3308C, and in the range of microwave electromagnetic radiation. This glass system was chosen due to its lower Tg value, [8] in relation to borosilicate glasses. Different microwave methods [9 -11] can be used to determine the dielectric behavior of the glasses; the shorted-line method was chosen for this work.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric Measurements as a Function of Temperature of Sodium‐Lithium Phosphate Glasses Evaluated at 10 MHz and 9 GHz

Bergo¹,

Prison²

2007

Spectroscopy Letters

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Dielectric constant measurements can be performed at temperatures greater than room temperature; some techniques are shown in this work. The dielectric constant of phosphate glasses, measured in the X-band microwave range, was determined using a microwave setup assembled to measure the shift in the standing wave pattern produced by the insertion of the sample inside the waveguide. The glass system 50P 2 O 5 . 25Li 2 O . 25Na 2 O was chosen in this work due to its lower melting point and lower transition temperature (T g ) values. The dielectric constant of the glass studied in this work increases in the temperature range 25 -3308C, as shown by the results at radio and microwave frequencies. The method of standing wave shift was applied, and it is shown to be a useful tool to estimate the T g of glasses. This assumption was confirmed by differential thermal analysis technique. Measurements were compared to that at 10 MHz by impedancimetric methods.

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Monoclinic α‐NaVOPO ₄ as cathode materials for sodium‐ions batteries: Experimental and DFT investigation

et al. 2020

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Summary Sodium vanadyl orthophosphate NaVOPO4 is an attractive High‐Potential cathode material for Na‐ions batteries with three polymorphs (α, β, and α1). In this work, pure phase of monoclinic α‐NaVOPO4 was synthesized by sol‐gel method and the origin of its poor electrochemical activity was investigated. Sample characterization using X‐ray diffraction, Raman spectroscopy, magnetic measurement and Fourier transform infrared (FT‐IR) spectroscopy confirm the formation of a single phase of monoclinic NaVOPO4 without any impurities. Electrochemical properties were also characterized using cyclic voltammetry, galvanostatic charge‐discharge and electrochemical impedance spectroscopy. The results indicate that α‐NaVOPO4 exhibit a good ionic conductivity but the charge transfer resistance is large. Optical analysis and DFT calculations both showed that the α‐NaVOPO4 is a semi‐conductor with a band‐gap energy of 2.24 eV which explain the origin of the high charge transfer resistance measured using EIS technique. From all these experimental and theoretical results, the poor electrochemical activity of α‐NaVOPO4 can be associated to its low intrinsic electronic conductivity. Electronic and ionic properties of the NaVOPO4 polymorphs are not yet fully characterized. Here, the monoclinic NaVOPO4 was investigated and the material exhibits a high voltage, a good ionic conductivity and good stability, but it exhibits a poor performance. The EIS, optical, and DFT result explain the origin of such behavior. A detailed magnetic study was also reported in this paper.

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Preparation and characterization of phosphate glasses containing titanium and vanadium

Cited by 21 publications

References 12 publications

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

Dielectric Measurements as a Function of Temperature of Sodium‐Lithium Phosphate Glasses Evaluated at 10 MHz and 9 GHz

Monoclinic α‐NaVOPO ₄ as cathode materials for sodium‐ions batteries: Experimental and DFT investigation

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Preparation and characterization of phosphate glasses containing titanium and vanadium

Cited by 21 publications

References 12 publications

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

Dielectric Measurements as a Function of Temperature of Sodium‐Lithium Phosphate Glasses Evaluated at 10 MHz and 9 GHz

Monoclinic α‐NaVOPO 4 as cathode materials for sodium‐ions batteries: Experimental and DFT investigation

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Monoclinic α‐NaVOPO ₄ as cathode materials for sodium‐ions batteries: Experimental and DFT investigation