Synthèse et caractérisation de strontium–calcium–lanthane apatites Sr7−xCaxLa3(PO4)3(SiO4)3F2 0 ≤ x ≤ 2

Boughzala, Khaled; Bouzouita, Khaled

doi:10.1016/j.crci.2014.11.011

Cited by 17 publications

(8 citation statements)

References 46 publications

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“…This confirms the results obtained by XRD (Figure 1). Both bands at 1,616 and 1,630 cm -1 are due to the bending vibration of the hydroxyl (OH -) (H-O-H) (Nikcevic et al, 2004;Yous et al, 2018;Aines and Rossman, 1984;Boughzala and Bouzouita, 2015). A series of vibrations was observed in the 3,200-3,550 cm -1 region which could be assigned to OH group vibrations bound by hydrogen bonds (O-H asymmetrical and symmetrical stretching vibrations).…”

Section: Infrared Spectroscopymentioning

confidence: 98%

Natural Phosphates Characterization and Evaluation of their Removal Efficiency of Methylene Blue and Methyl Orange from Aqueous Media

Assimeddine

Abdennouri

Barka

et al. 2021

Environ. Nat. Resour. J.

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This study evaluated the capacity of a rock phosphate for the adsorption of organic dyes methylene blue MB and methyl orange MO in aqueous solution, in order to minimize the impact of these dyes on the environment. The physicochemical characterization of natural phosphates (NP) shows that its mineralogy is carbonate-fluorapatite, calcite and quartz, as demonstrated by X-ray diffraction. An infrared (IR) analysis completed the structural study by confirming the characteristic bands of a carbonated fluorapatite type B. The influence of adsorbent dose, pH, initial concentration and temperature of the dye solution on adsorption onto NP was studied. The experimental results show that MB is adsorbed almost entirely at an adsorbent dose of 1 g/L and at a more basic pH and that the Langmuir model describes its isotherm well. For MO, adsorption is performed at acidic pH, such that discoloration reaches 60% at pH 4 and NP adsorbent dose of 10 g/L. The maximum adsorbed amounts of MB (pH=9) and MO (pH=4) were found to be 9.54 and 1.09 mg/g, respectively. The kinetic data were analyzed to show that the pseudo-second-order model seems to be the most appropriate to describe the adsorption dynamics of both dyes on the naturel phosphate. The thermodynamic results show that the adsorption is endothermic for MB and exothermic for MO. So, rock phosphate shows a good potential as a sorbent for cationic dyes removal from wastewater.

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Section: Infrared Spectroscopymentioning

confidence: 98%

Natural Phosphates Characterization and Evaluation of their Removal Efficiency of Methylene Blue and Methyl Orange from Aqueous Media

Assimeddine

Abdennouri

Barka

et al. 2021

Environ. Nat. Resour. J.

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“…In other words, the conductivity of KPbFAp was particularly ensured by jumping ions; 56,57 where fluoride ions were the only charge carriers. 58,59 This energy of activation Δ E a was lower than that provided in the fluorapatite containing lithium (Δ E a = 1.64 eV), 24 in which the authors conclude that it was the mobility of the fluoride ions along the c axis that was the dominating factor for the conductivity, with the contributions of the Pb 2+ being negligible. 29,32,53 The study carried out by Laghzizil et al (2001) examined the conductivity of the following fluorapatites, where the conductivity of fluorine ions was ensured: M 10 (PO 4 ) 6 F 2 (where M = Ca, Ba), which displayed, respectively, activation energies of 1.86 and 1.47 eV, whereas the Pb 10 (PO 4 ) 6 F 2 compound, which showed a transition at 480 °C, displays activation energies of respectively 0.25 and 1.36 eV before and after this transition.…”

Section: Resultsmentioning

confidence: 91%

Synthesis of a new potassium-substituted lead fluorapatite and its structural characterization

Hamza,

Hamdi,

Ben Ahmed

et al. 2024

RSC Adv.

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“…The wavenumbers of carbonate vibrations illustrated in Figure 2 show the characteristic bands of type B carbonate-fluorapatite (CO 3 2substitute PO 4 3ions). Both vibration bands observed at 1616 cm -1 and 1637 cm -1 were attributed to the bending vibration of the hydroxyl (OH -) of H-O-H [21,[24][25][26]. The series of vibrations were observed in the 3200 cm -1 to 3550 cm -1 region could be assigned to OH group asymmetric and symmetric stretching vibrations.…”

Section: Attenuated Total Reflectance-infrared Spectroscopy Of Soybea...mentioning

confidence: 96%

Study of the effect of pH, conditioning and flotation time on the flotation efficiency of phosphate ores by a soybean oil collector

et al. 2022

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The mid-low grade of phosphate ore, rich by the silicate and carbonate gangue minerals needs a special treatment using the flotation process. Where the collectors play a pivotal role. This study was conducted to enrich an untreated phosphate ore (without washing, desliming, hydrocycling, etc.), with an eco-friendly and economic collector based on soybean oil. Different analytical techniques such as UV-Visible, ATR-FTIR spectrometric and XRD were used in order to analyse and characterize the flotation products. The effects of the parameters, pulp pH, conditioning time and flotation time on gangue removal efficiency by flotation, were investigated. Flotation tests were applied for granulometric class (90 mm to 125 µm). Consequently, a good quality phosphate concentrate was obtained in an acidic medium (pH = 4.05) with 1 g of soybean oil soap collector, 20 min flotation time, 10 min conditioning time, 0.17 L×min-1 air superficial velocity, 800 rpm at 25℃ and 6% solid content. The concentrate contained 29.0% phosphorus pentoxide (P2O5), with a recovery of 94.5% from a feed sample containing about 24.5% P2O5.

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Synthèse et caractérisation de strontium–calcium–lanthane apatites Sr7−xCaxLa3(PO4)3(SiO4)3F2 0 ≤ x ≤ 2

Cited by 17 publications

References 46 publications

Natural Phosphates Characterization and Evaluation of their Removal Efficiency of Methylene Blue and Methyl Orange from Aqueous Media

Natural Phosphates Characterization and Evaluation of their Removal Efficiency of Methylene Blue and Methyl Orange from Aqueous Media

Synthesis of a new potassium-substituted lead fluorapatite and its structural characterization

Study of the effect of pH, conditioning and flotation time on the flotation efficiency of phosphate ores by a soybean oil collector

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