Solubility and thermodynamic data of cadmium hydroxyapatite in aqueous media

Mahapatra, P. P.; Mishra, H.K.; Chickerur, N. S.

doi:10.1016/0040-6031(82)85059-4

Cited by 11 publications

(15 citation statements)

References 8 publications

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“…The unchanged morphology of the solid particles would privilege the first process, while the very low value of the diffusion coefficient in the HA (10 −50 to 10 −70 cm 2 /s) [10] would rather account for the second one. The solubility product (K SP ) of CdHA and HA, determined by Mahapatra et al [11], are very similar (9.6 × 10 −153 and 2.7 × 10 −152 , respectively) and do not allow any conclusion about this second step.…”

Section: Discussionmentioning

confidence: 85%

Cadmium fixation by synthetic hydroxyapatite in aqueous solution—Thermal behaviour

Marchat

Bernache‐Assollant

Champion

2007

Journal of Hazardous Materials

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Section: Discussionmentioning

confidence: 85%

Cadmium fixation by synthetic hydroxyapatite in aqueous solution—Thermal behaviour

Marchat

Bernache‐Assollant

Champion

2007

Journal of Hazardous Materials

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“…e positive value of ΔH°indicated also that the dissolution was an endothermic reaction and the solubility increased with the increase in temperature. e higher ΔS°value for the natroalunite dissolution indicated that the order degree caused by SO 4 2− was greater than by AsO 4 3− in aqueous solution, which is related to the different bond distances (S-O 1.473Å and As-O 1.682Å) [50,51]. e smaller SO 4 2− with a low charge can result in greater entropy, and consequently the synthetic natroalunite was more soluble than the arsenic-incorporated natroalunite in aqueous media.…”

Section: Determination Of Ermodynamic Datamentioning

confidence: 98%

“…where A, B, and C are the empirical coefficients of equation (13). e ΔG°values for the dissolution of the synthetic natroalunite and the synthetic arsenic-incorporated natroalunite increased with the temperature increase which showed that their dissolutions were energy expending processes [50].…”

Section: Determination Of Ermodynamic Datamentioning

confidence: 99%

“…e solubility products (K sp ) for the synthetic natroalunite and the arsenicincorporated natroalunite can also be estimated using the following equations [50]:…”

Section: Determination Of Ermodynamic Datamentioning

confidence: 99%

“…e thermodynamic quantities ΔG°, ΔH°, ΔS°, and ΔC°p for the dissolution of the synthetic natroalunite and the arsenic-incorporated natroalunite at initial pH 2.00 were estimated after equations (17)∼(20) [50] and are given in Table 3:…”

Section: Determination Of Ermodynamic Datamentioning

confidence: 99%

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Dissolution and Solubility of the Synthetic Natroalunite and the Arsenic-Incorporated Natroalunite at pH of 2.00–5.60 and 25–45°C

Zhu

Xuan

Liang

et al. 2019

Journal of Chemistry

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Arsenic is very harmful to most living organisms. The solubility data of As-containing compounds are significant in geoscience and environmental science. The arsenic-incorporated natroalunite precipitation has been proposed to eliminate arsenic from water, both for industrial practice and remediation of polluted areas. Unfortunately, only few works have been made on partial arsenic incorporation in natroalunite and the thermodynamic data for natroalunite and arsenic-incorporated natroalunite now are still lacking. Moreover, the dissolution mechanisms of arsenic-incorporated natroalunites have never been studied. In the present work, the dissolution of the synthetic natroalunite [Na0.93(H3O)0.61Al2.82(SO4)2(OH)6] and the synthetic arsenic-incorporated natroalunite [Na0.88(H3O)2.44Al2.35(AsO4)0.38(SO4)1.62(OH)6] at 25°C, 35°C, and 45°C was experimentally examined in HNO3 solution (pH of 2.00 and 4.00) and pure water. The characterizations confirmed that the solids showed no recognizable change after dissolution. All dissolutions underwent a pH variation, which was caused by a great depleting of H3O+/OH− ions, typically at the reaction beginning. The dissolution in H3O+ medium proved to be near-stoichiometric within the short beginning period, and the dissolved Na+, Al3+, SO42−, and AsO43− concentrations were stoichiometric according to the initial solids and then appeared to be nonstoichiometric with the Na/SO4 mole ratios higher and the Al/SO4 and AsO4/SO4 mole ratios lower than the stoichiometry until the experimental end, indicating that the components were released from solid to solution preferentially after the following order: Na+ (H3O+) > SO42− > AsO43− > Al3+. From the experimental results under the condition of initial pH 2.00 and 25°C, the solubility products [Ksp] and the Gibbs free energies of formation [ΔGf°] were calculated to be 10−81.02±0.33∼10−81.04±0.27 and −4713 ± 2 to −4714 ± 1 kJ/mol for the natroalunite and 10−92.30±0.30∼10−92.41±0.37 and −5078 ± 2 to −5079 ± 2 kJ/mol for the arsenic-incorporated natroalunite, respectively. The thermodynamic quantities, ΔG°, ΔH°, ΔS°, and ΔCp°, were determined to be 462303.43 J/K·mol, 122466.83 J/mol, −1140.39 J/K·mol, and 4280.13 J/K·mol for the natroalunite dissolution reaction at initial pH 2.00 and 25°C and to be 526925.48 J/K·mol, 159674.76 J/mol, −1232.38 J/K·mol, and 1061.12 J/K·mol for the dissolution of the arsenic-incorporated natroalunite at initial pH 2.00 and 25°C, respectively.

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Synthesis and Characterization of Hydroxyapatite and Hydroxyapatite‐Based Catalysts

Jemli¹,

Abdelouahdi²,

Minh

et al. 2022

Design and Applications of Hydroxyapatite‐Based Catalysts

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Solubility and thermodynamic data of cadmium hydroxyapatite in aqueous media

Cited by 11 publications

References 8 publications

Cadmium fixation by synthetic hydroxyapatite in aqueous solution—Thermal behaviour

Cadmium fixation by synthetic hydroxyapatite in aqueous solution—Thermal behaviour

Dissolution and Solubility of the Synthetic Natroalunite and the Arsenic-Incorporated Natroalunite at pH of 2.00–5.60 and 25–45°C

Synthesis and Characterization of Hydroxyapatite and Hydroxyapatite‐Based Catalysts

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