Factors influencing the removal of divalent cations by hydroxyapatite

Smiciklas, I.; Onjia, Antonije; Raičević, S.; Janaćković, Djordje; Mitrić, Miodrag

doi:10.1016/j.jhazmat.2007.07.056

Cited by 227 publications

(145 citation statements)

References 34 publications

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“…It should be noted that KNO 3 did not act as a purely inert electrolyte in the adsorption system, since increasing the initial concentration of KNO 3 led to a decrease in the final pH of the solution; however, the fluctuation of the final pH with the KNO 3 concentration was quite small. This phenomenon may be explained in terms of specific cation adsorption onto the adsorbent surface (Smiciklas et al 2008). Similar results have been reported byŠljivić et al…”

Section: Effect Of Phsupporting

confidence: 87%

“…X-Ray diffraction (XRD) analyses were carried out on a TTRIII (Japan) instrument employing Cu Kα Ni-filtered radiation. Points of zero charge (pH PZC ) were determined via a batch equilibration technique (Smiciklas et al 2000).…”

Section: Analysis Of Adsorbent Characteristics and Determination Of Pmentioning

confidence: 99%

“…When clay minerals are used to remove cations from aqueous solution, the main mechanism involved in the process is ion-exchange (Sprynskyy et al 2006). The cation-exchange capacity (CEC) of a material is a parameter that can be used to evaluate the number of negatively charged sites on its surface capable of attracting cations.…”

Section: Effect Of Phmentioning

confidence: 99%

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Adsorption of Pb²⁺ and Ni²⁺ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies

Miao

Liu

et al. 2009

Adsorption Science & Technology

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ABSTRACT:The adsorption of Pb 2+ and Ni 2+ ions from aqueous solution onto montmorillonite (MMT) has been investigated at 293 K, 303 K, 313 K and 323 K using batch equilibrium experiments. In order to optimize the adsorption conditions, the effects of contact time, solution pH and initial metal ion concentrations were tested thoroughly. The adsorption isotherms were best described by the Langmuir model at lower temperatures, while the Freundlich model gave a better fit at higher temperatures.

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Section: Effect Of Phsupporting

confidence: 87%

Section: Analysis Of Adsorbent Characteristics and Determination Of Pmentioning

confidence: 99%

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Adsorption of Pb²⁺ and Ni²⁺ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies

Miao

Liu

et al. 2009

Adsorption Science & Technology

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“…. Such release of protons accompanied with cation sorption is a positive sign of specific cation sorption mechanism [33,34]. The differences between pH PZC and equilibrium pH were in the range 1.50-2.87 pH units, for variously treated bone sorbents.…”

Section: Sorption Of CD 2?mentioning

confidence: 93%

“…concentration [33], and the same sorbent and various concentrations of Cd 2? [34]. Analysis of the equilibrium concentrations of Ca 2?…”

Section: Sorption Of CD 2?mentioning

confidence: 99%

Evaluation of the effects of treatment factors on the properties of bio-apatite materials

et al. 2014

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Animal bones have been studied as a resource of low-crystalline apatite for immobilization of toxic heavy metals. Chemical and thermal treatments can be applied for selective removal of bone organic constituents. In this study, the impact of different treatment factors was determined by experimental design methodology, and comparison of the estimated effects was performed in order to optimize the treatment conditions. Fractional factorial design with five variables at two levels was applied for factors screening. The type of chemical reagent (H 2 O 2 or NaOH), its concentration (0.1 or 2 mol/L), reaction temperature (20 or 60°C), contact time (1 or 3 h) and sample annealing (without or at 400°C) were considered as process variables. Structural properties of bone sorbents, loss of ignition, point of zero charge, surface functional groups, specific surface area, chemical composition, and Cd 2? sorption efficiency, were selected as system responses. Samples significantly differed in respect to the organic phase content and composition, thus mechanisms of Cd 2? sorption were complex. Statistical analysis has revealed that, between all studied factors, temperature treatment was the most important for sorbents increased specific surface area, porosity and cation sorption. Furthermore, NaOH was more effective than H 2 O 2 , while the effects produced by variation of other factors were less pronounced. The highest proportion of bio-apatite with desired low crystallinity and high specific surface area was achieved by synergetic effects of chemical treatment with NaOH and thermal treatment at 400°C.

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Hydroxyapatite‐Based Catalysts in Organic Synthesis

Gruselle¹,

Tõnsuaadu²,

Gredin³

et al. 2022

Design and Applications of Hydroxyapatite‐Based Catalysts

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Factors influencing the removal of divalent cations by hydroxyapatite

Cited by 227 publications

References 34 publications

Adsorption of Pb²⁺ and Ni²⁺ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies

Adsorption of Pb²⁺ and Ni²⁺ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies

Evaluation of the effects of treatment factors on the properties of bio-apatite materials

Hydroxyapatite‐Based Catalysts in Organic Synthesis

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Factors influencing the removal of divalent cations by hydroxyapatite

Cited by 227 publications

References 34 publications

Adsorption of Pb2+ and Ni2+ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies

Adsorption of Pb2+ and Ni2+ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies

Evaluation of the effects of treatment factors on the properties of bio-apatite materials

Hydroxyapatite‐Based Catalysts in Organic Synthesis

Contact Info

Product

Resources

About

Adsorption of Pb²⁺ and Ni²⁺ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies

Adsorption of Pb²⁺ and Ni²⁺ Ions by Montmorillonite: Isotherm, Kinetic and Thermodynamic Studies