Synthesis and thermal dehydroxylation kinetic of anhydrous calcium phosphate monetite CaHPO4

Mulongo-Masamba, Raphaèl; Kassri, Taoufik El; Khachani, Mariam; Arsalane, Saı̈d; Halim, Mohammed; Hamidi, Adnane El

doi:10.1007/s10973-015-5130-y

Cited by 34 publications

(22 citation statements)

References 33 publications

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“…The sample heated at 400ºC had similar spectra with that at 700ºC. The absorption peak at 720 cm -1 was due to P-O-P bonding in condensed phosphate [19]. These IR results correspond with the above XRD results.…”

Section: Preparation Of Calcium Phosphatessupporting

confidence: 84%

“…Figure 2 shows IR spectra of samples prepared at pH 5 and then heated at several temperatures. The multiple peaks observed in the regions 1200-400 cm -1 of IR spectrum of non-heated sample can be due to P-O internal vibration in CaHPO 4 [19]. The strong peaks at 1140, 1060, and 980 cm -1 are assigned to stretching vibration of the P-O band.…”

Section: Preparation Of Calcium Phosphatesmentioning

confidence: 89%

“…The formation of these phosphates was affected from a Ca/P mixing ratio of raw materials, heating temperature and time, additives, and so on [15][16][17]. Further, phosphate materials produce condensed phosphate in a dehydration reaction [18,19]. These condensed phosphates have the possibility of having different properties than orthophosphate.…”

Section: Introductionmentioning

confidence: 99%

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Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution

Onoda¹

2017

ujms

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Calcium phosphate is an important material used in ion exchangers and adsorbents. In this work, calcium hydrogen phosphate dihydrate, CaHPO 4 •2H 2 O, was prepared from calcium nitrate solution and phosphoric acid. This phosphate transformed to calcium hydrogen phosphate un-hydrate, CaHPO 4 , by heating at 200ºC, and calcium pyrophosphate, Ca 2 P 2 O 7 , by heating at 400 and 700ºC. These calcium phosphates were used to remove trivalent iron cation, Fe 3+ in solution. Samples without heating and those heated at 200ºC indicated a high iron removal ratio. By the addition of these calcium phosphates and stirring for 5 minutes, a high ratio of iron cation was removed from the solution. This removal depended not only on the substitution of calcium to iron, but also on the precipitation of iron hydroxide. Calcium phosphates were also used to remove copper and nickel cations, Cu 2+ and Ni 2+. The removal ratios of copper and nickel cations were lower than those of iron cation.

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Section: Preparation Of Calcium Phosphatessupporting

confidence: 84%

Section: Preparation Of Calcium Phosphatesmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution

Onoda¹

2017

ujms

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“…The IR absorption peaks were gradually changed from Zn/Ti=0/100 to 100/0. The peaks at 1120, 1040, and 620 cm −1 were attributed to phosphate anions . All precipitates were phosphate materials.…”

Section: Resultsmentioning

confidence: 95%

“…The peaks at 1120, 1040, and 620 cm À1 were attributed to phosphate anions. 21 All precipitates were phosphate materials. The peaks at 1400 cm À1 were attributed to ammonium cation.…”

Section: Chemical Composition and Powdermentioning

confidence: 99%

Synthesis and powder properties of titanium—Zinc phosphate white pigments

Onoda

Minamizawa

2017

Int J Applied Ceramic Tech

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Photocatalytically active titanium dioxide and zinc oxide are used as a white pigment for cosmetics, leading to decomposition of a certain degree of sebum on the skin upon exposure to the ultraviolet radiation in sunlight. Herein, as novel white pigments for use in cosmetics, titanium‐zinc phosphates were prepared from titanium sulfate, zinc sulfates, and phosphoric acid. The chemical composition, powder properties, photocatalytic activity, color phase, smoothness, and acid resistance of the titanium‐zinc phosphates were evaluated. Samples prepared at high titanium ratio were easy to be amorphous phase, on the other hand, samples prepared at high zinc ratio indicated the X‐ray diffraction peaks of zinc phosphate dihydrate. The photocatalytic activity of these titanium‐zinc phosphate particles was low; thus these pigments should not induce decomposition of sebum on the skin. All samples prepared in this study exhibited high reflectance within the range of visible light. The substitution with titanium is effective to improve acid resistance of zinc phosphate white pigments.

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Crystal Structure of γ‐Ca₂P₂O₇

Sauskojus¹,

Wied²,

Litterscheid³

et al. 2022

Zeitschrift anorg allge chemie

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Three polymorphs of calcium pyrophosphate, Ca2P2O7, are known. Here the crystal structure of γ‐Ca2P2O7 is described for the first time. The crystal structure could be solved from powder X‐ray data. The results were confirmed by 31P high‐resolution solid‐state NMR spectroscopy measurements and by quantum chemical calculations under period boundary conditions. With the help of spin‐echo experiments the 2J(31P,31P) coupling for the P−O−P bonds could be determined. The different polymorphs can unambiguously be identified from 31P magic‐angle‐spinning NMR spectroscopy. The 31P NMR chemical shift parameters of α‐, β‐ and γ‐Ca2P2O7 were determined from magic‐angle‐spinning experiments at slow spinning frequencies, while a peak assignment was achieved on the basis of gipaw‐calculations and confirmed by the observed J‐coupling values. The polymorph γ‐Ca2P2O7 belongs to the structure type of Cd2P2O7 in the space group Ptrue1‾ ${P\bar 1}$ (a=6.6660 (2) Å, b=6.7220 (2) Å, c=6.7374 (2) Å, α=65.113 (2)°, β=87.763 (2)°, γ=85.076 (2)°).

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Synthesis and thermal dehydroxylation kinetic of anhydrous calcium phosphate monetite CaHPO4

Cited by 34 publications

References 33 publications

Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution

Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution

Synthesis and powder properties of titanium—Zinc phosphate white pigments

Crystal Structure of γ‐Ca₂P₂O₇

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Synthesis and thermal dehydroxylation kinetic of anhydrous calcium phosphate monetite CaHPO4

Cited by 34 publications

References 33 publications

Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution

Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution

Synthesis and powder properties of titanium—Zinc phosphate white pigments

Crystal Structure of γ‐Ca2P2O7

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Product

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About

Crystal Structure of γ‐Ca₂P₂O₇