Preparation and crystal structure of two types of zirconium phosphates by hydrothermal reaction

Kumada, Nobuhiro; Hinata, J.; Dong, Qiang; Yonesaki, Yoshinori; Takei, Takahiro; Kinomura, Nobukazu

doi:10.2109/jcersj2.119.412

Cited by 9 publications

(3 citation statements)

References 15 publications

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“…The X-ray diffractograms of materials synthesized by using Na 2 HPO 4 are shown in Figure A. The diffractograms cannot be matched with the XRD patterns of any known sodium zirconium phosphate-related compound, such as disodium-exchanged α-ZrP, Zr(NaPO 4 ) 2 ·3H 2 O and Zr(NaPO 4 )(HPO 4 )·H 2 O, or three-dimensional NaZr 2 (PO 4 ) 3 , which had been reported previously. − To confirm that the synthesized samples are sodium-exchanged α-ZrP, they were treated with 0.2 M HCl solutions. Na + was readily exchanged by H + , and dihydrogen α-ZrP (α-Zr(HPO 4 ) 2 ·H 2 O) was obtained after the acid treatment (Figure B).…”

Section: Resultsmentioning

confidence: 82%

One-Pot Synthesis of Layered Disodium Zirconium Phosphate: Crystal Structure and Application in the Remediation of Heavy-Metal-Contaminated Wastewater

et al. 2019

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Inorganic ion exchangers offer advantages whenever operation at high temperatures or in oxidizing environments is required. A novel two-dimensional disodium zirconium phosphate, Zr(NaPO4)2·H2O, was reported and investigated as an ion exchanger for heavy metals. The material was synthesized by a novel minimalistic solventless approach, and its solid-state structure was determined from powder X-ray diffraction data. Zr(NaPO4)2·H2O crystallizes in the space group P21/c with cell parameters a = 8.7584(1) Å, b = 5.3543(1) Å, c = 18.1684(3) Å, β = 109.053 (1)°, and Z = 4. Its layered structure is similar to that of α-zirconium phosphate, Zr(HPO4)2·H2O. However, unlike α-zirconium phosphate which is limited in practical applications by its narrow interlayer spacing (d = 7.6 Å), the disodium zirconium phosphate has a larger spacing of 8.6 Å between planes. The material with inherent structural advantages displays excellent sorption for heavy metals such as Pb2+, Cu2+, Cd2+, and Tl+, maintaining its high selectivity with distribution coefficients, K d, of 104–105 mL/g even in the presence of a large excess of Na+, K+, Mg2+, and Ca2+, which are commonly present in underground water. In particular, the maximum sorption capacity for the highly toxic Tl+ is a record high, 5.07 mmol/g (1036 mg/g). The fast reaction kinetics indicate that the exchangeable positions in Zr(NaPO4)2·H2O are readily accessible, in contrast to Zr(HPO4)2·H2O. The ease of preparation, benign nature, and advantageous ion-exchange properties make Zr(NaPO4)2·H2O a highly promising sorbent for the treatment of water polluted with heavy metals.

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Section: Resultsmentioning

confidence: 82%

One-Pot Synthesis of Layered Disodium Zirconium Phosphate: Crystal Structure and Application in the Remediation of Heavy-Metal-Contaminated Wastewater

et al. 2019

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“…It has been extensively studied due to its excellent ion conductivity 2 and low thermal expansion as ion exchanger ceramic materials 3 nuclear waste treatment materials 4 and sodium fast ion conductor materials 5 . Many preparation methods have been developed to synthesize sodium zirconium phosphates, such as solid-phase synthesis 6,7 and sol-gel methods 8,9 and one-pot method 10 . The solid-state reaction method is the most often used among these methods.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal preparation of cubic sodium zirconium phosphate crystals

Wang¹,

Bai²,

Zuo³

et al. 2023

J. Phys.: Conf. Ser.

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NASICON type material NaZr2(PO4)3 is considered to be the ideal solid electrolyte choice for solid-state Na batteries due to its excellent low thermal expansion and Na ion conductivity. However, the often-prepared solid-state reaction method requires a high reaction temperature and produces other polymerized phosphates and environmentally unfriendly substances. This paper’s hydrothermal method quickly prepared NaZr2(PO4)3 crystals with cubic morphologies at a low temperature. The effects of different concentrations of NaH2PO4 solution and different hydrothermal times on the preparation of the powders were explored. XRD, SEM, TEM and IR tests characterized the as-prepared samples. The results show that the NaZr2(PO4)3 crystals synthesized by the hydrothermal method have good crystallinity and a clean surface, with a standard cubic morphology and a size distribution between 400 nm and 750 nm. This indicates that the hydrothermal method is an effective synthesis one.

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“…These bismuthates had never been prepared by hightemperature solid-state reaction. As for zirconium phosphates, seven types of zirconium phosphates were obtained by hydrothermal reaction using a hydrate zirconium oxychloride, ZrOCl 2 ·8H 2 O [25][26][27][28][29]. The structural features of these zirconium phosphates can be described as one-, two-or three-dimensional structures built up by corner-sharing of ZrO 6 octahedra and PO 4 tetrahedra.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of KTi₂(PO₄)₃, α-Ti(HPO₄)₂·H₂O and γ-Ti(PO₄)(H₂PO₄)·2H₂O from a lepidocrocite-type titanate

Kumada

Imase

Yanagida

et al. 2019

Journal of Asian Ceramic Societies

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A potassium titanium phosphate, KTi 2 (PO 4 ) 3 , and two types of hydrated titanium phosphates, α-Ti(HPO 4 ) 2 •H 2 O and γ-Ti(PO 4 )(H 2 PO 4 )•2H 2 O, were prepared by hydrothermal reaction using a layered lepidocrocite-type titanate as a starting compound. When layered lepidocrocitetype K 0.7 (Li,Ti) 2 O 4 (Lss; Ohtsuka Chemical Co., Ltd.) was used at a reaction temperature of 180°C, KTi 2 (PO 4 ) 3 was obtained. The crystal structure of KTi 2 (PO 4 ) 3 was a NASICON-like rhombohedral one with a low thermal expansion coefficient. The thermal expansion coefficient of KTi 2 (PO 4 ) 3 was determined using synchrotron X-ray powder diffraction data (SRXD), and the thermal expansion coefficients for the a-axis, c-axis and unit cell volume were −2.82 x 10 −6 , 7.16 × 10 −6 and 1.49 × 10 −6 K −1 , respectively. Two types of layered titanium phosphates, α-Ti(HPO 4 ) 2 •H 2 O and γ-Ti(PO 4 )(H 2 PO 4 )•2H 2 O, were prepared by hydrothermal reaction using protonated titanate (Lss-H) derived from lepidocrocite-type potassium titanate (Lss) by the ion-exchange reaction.

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Preparation and crystal structure of two types of zirconium phosphates by hydrothermal reaction

Cited by 9 publications

References 15 publications

One-Pot Synthesis of Layered Disodium Zirconium Phosphate: Crystal Structure and Application in the Remediation of Heavy-Metal-Contaminated Wastewater

One-Pot Synthesis of Layered Disodium Zirconium Phosphate: Crystal Structure and Application in the Remediation of Heavy-Metal-Contaminated Wastewater

Hydrothermal preparation of cubic sodium zirconium phosphate crystals

Hydrothermal synthesis of KTi₂(PO₄)₃, α-Ti(HPO₄)₂·H₂O and γ-Ti(PO₄)(H₂PO₄)·2H₂O from a lepidocrocite-type titanate

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Preparation and crystal structure of two types of zirconium phosphates by hydrothermal reaction

Cited by 9 publications

References 15 publications

One-Pot Synthesis of Layered Disodium Zirconium Phosphate: Crystal Structure and Application in the Remediation of Heavy-Metal-Contaminated Wastewater

One-Pot Synthesis of Layered Disodium Zirconium Phosphate: Crystal Structure and Application in the Remediation of Heavy-Metal-Contaminated Wastewater

Hydrothermal preparation of cubic sodium zirconium phosphate crystals

Hydrothermal synthesis of KTi2(PO4)3, α-Ti(HPO4)2·H2O and γ-Ti(PO4)(H2PO4)·2H2O from a lepidocrocite-type titanate

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Hydrothermal synthesis of KTi₂(PO₄)₃, α-Ti(HPO₄)₂·H₂O and γ-Ti(PO₄)(H₂PO₄)·2H₂O from a lepidocrocite-type titanate