Solubility of cadmium hydrogen phosphate in aqueous media

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

doi:10.1016/0040-6031(82)87160-8

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…There is an expectation that the selective adsorption and removal of cadmium metal ions can be reached at pH ≈5. In competitive environments, Cd 2+ ions may precipitate as CdHPO 4 at pH higher than 5 and as Cd 10 (PO 4 ) 6 (OH) 2 at pH 7.5–8.0 (Figure b,e. On the other hand, the adsorption of phosphate on Ti–Fe chitosan LDH was investigated at varied pH (2–10) solutions.…”

Section: Results and Discussionmentioning

confidence: 99%

Comparative Study of Single and Multiple Pollutants System Using Ti–Fe Chitosan LDH Adsorbent with High Performance in Wastewater Treatment

et al. 2017

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Ti–Fe chitosan (LDH) nanoparticles with nitrate intercalated anions as a novel adsorbent were produced via milling technique. The synthesized LDH was characterized by XRD, FT-IR, BET surface area, zeta potential, FESEM, and HRTEM. The adsorption capability of novel catalyst was under study with regard to several pollutants in the wastewater (phosphate, cadmium, and benzoquinone) in single and multiple solutions. Ti–Fe chitosan LDH demonstrated high activity toward cadmium and benzoquinone and succeeded to remove 98% of both and 63% of phosphate in wastewater at pH = 8. However, in multiple solutions, the results reached 58, 95, and 82% removal of cadmium, benzoquinone, and phosphate, respectively, at the same pH. The kinetics and mechanism of adsorption strength over the adsorbent were further studied. Furthermore, the adsorption of cadmium was confirmed by potentiometric analysis. Astonishingly, the novel LDH indicates acceptable antimicrobial activities against some species of bacteria and fungi.

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Section: Results and Discussionmentioning

confidence: 99%

Comparative Study of Single and Multiple Pollutants System Using Ti–Fe Chitosan LDH Adsorbent with High Performance in Wastewater Treatment

et al. 2017

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“…Much research work has been done in this field. For example, the determination of solubility of scorodite(FeAsO 4 •2H 2 O) [2,4]; and determination of solubility product of various calcium arsenate [2,[5][6][7][8][9]. Jagannathan Iyer and Nabar [15] studied Sr 5 (AsO 4 ) 3 OH and found that when Sr/As is 1:2.5 and pH at 10~11, or when the Sr/As is 2:1 and pH at 6~11 , Sr 5 (AsO 4 ) 3 OH generated easily and remained stable.…”

Section: Introductionmentioning

confidence: 99%

Dependence of Stability of Sr5(AsO4)3OH on pH Value

Huang

Li²,

Qin³

et al. 2014

AMM

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The object of this work was to determine the solubility and stability of the synthetic Sr5(AsO4)3OH solid solution at 25°C and the different initial pHs (pH at 2, 6 and 9) by batch dissolution experiments. The results indicated that with the initial pH value of 2, 6 and 9, the reaction system reached equilibrium after 2880h, and by that time the pH value of the solution reached, 7.90, 8.74 and 8.27 respectively. The concentration of strontium and arsenic in the initial solution pH at 2 are higher than that of solutions pH at 6 and 9. While the concentration of strontium in neutral or alkaline solutions is low and stays unchanged.

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“…[15] Some synthesis experiments at ambient temperatures were conducted to evaluate the conditions of formation and solubilities of different calcium arsenates. [11,16,17] Hydroxylapatite (HAP) is one of the most stable forms of calcium phosphate and exhibits a low solubility (K sp ¼ 10 À53.02 -10 À53.51 ); however, the solubility of AsHAP [Ca 5 (AsO 4 ) 3 (OH)] is significantly greater than that of HAP, [11,[18][19][20][21][22] which suggested that phosphate substitution in the arsenate compound could significantly reduce their solubilities. [21][22][23][24] The thermodynamic properties of solid solutions have a vital influence on the transport and fate of toxic metals in the environment.…”

Section: Introductionmentioning

confidence: 99%

“…[5] The thermodynamic solubility products for Ca 5 (AsO 4 ) 3 (OH) were 10 À45.20 at 358C, 10 À45.28 at 408C, 10 À45.34 at 458C and 10 À45.46 at 508C. [18] Therefore, the K sp values of 10 À57 for HAP [34] and 10 À41.68 for AsHAP [17] were used in the calculation using the program PHREEQC in the present study. The calculated saturation indices for Ca 5 (Fig.…”

Section: Saturation With Respect To Calcium Phosphates and Arsenatesmentioning

confidence: 99%

Dissolution and solubility of the arsenate - phosphate hydroxylapatite solid solution [Ca5(PxAs1 - xO4)3(OH)] at 25°C

et al. 2011

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Environmental context. Apatites form a large family of minerals and compounds that can incorporate a variety of ions, including arsenate that can substitute for phosphate. Apatites may therefore control the concentration of arsenic in some aqueous environments. This manuscript describes the synthesis and characterisation of the arsenate-phosphate hydroxylapatite solid solution and the solid solution-aqueous solution interaction.Abstract. Nine different members of the arsenate-phosphate hydroxylapatite solid solution [Ca 5 (P x As 1Àx O 4 ) 3 (OH)] were prepared and characterised by various techniques, and then dissolution of the synthetic solids was studied at 258C and pH 2 in a series of batch experiments. The concentrations of aqueous arsenate species increased rapidly at the beginning of the dissolution and reached a steady-state after 480 h. The concentrations of aqueous phosphate species increased very fast initially and reached a peak value within the first hour of dissolution and then declined slowly with time and remained constant after 240-360 h. The solubility of the Ca 5 (P x As 1Àx O 4 ) 3 (OH) solid solution increased and its stability decreased with an increase in the mole fraction of Ca 5 (AsO 4 ) 3 (OH). The dissolution followed or slightly overshot the Lippmann solutus curve, then approached the solutus curve. The Ca 5 (AsO 4 ) 3 (OH)-poor solid solution was in equilibrium with the arsenate-rich aqueous solution.

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Solubility of cadmium hydrogen phosphate in aqueous media

Cited by 5 publications

References 6 publications

Comparative Study of Single and Multiple Pollutants System Using Ti–Fe Chitosan LDH Adsorbent with High Performance in Wastewater Treatment

Comparative Study of Single and Multiple Pollutants System Using Ti–Fe Chitosan LDH Adsorbent with High Performance in Wastewater Treatment

Dependence of Stability of Sr<sub>5</sub>(AsO<sub>4</sub>)<sub>3</sub>OH on pH Value

Dissolution and solubility of the arsenate - phosphate hydroxylapatite solid solution [Ca5(PxAs1 - xO4)3(OH)] at 25°C

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