New strumming sleight for old tunes: Exploration on the sorption mechanisms of Cd(II) by hydroxyapatite synthesized with different molar Ca/P ratios

Zhang, Youwen; Tang, Haoyue; Xiao, Qi; Zhang, Yu; Zhao, Xuebing; Yang, Shitong

doi:10.1016/j.jece.2022.107919

Cited by 5 publications

(12 citation statements)

References 59 publications

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“…And the nano-HAP contained less adsorbed water. As shown in the XRD patterns of HAP samples in Figure 2(b), compared to the PDF standard hydroxyapatite (PDF#09-0432), it can be noticed that pristine micro-HAP and nano-HAP exhibited obvious characteristic peaks at 25.88°, 31.77°, 32.20°, and 32.90° corresponding {002} and {211}, {112} and {300} crystallographic facets, respectively [5, 27].…”

Section: Resultsmentioning

confidence: 99%

“…In addition, HAP is a kind of green and environment-friendly material, which possesses a robust hexagonal atomic framework based on two distinct calcium sites (Ca(I), Ca(II)), a tetrahedral-phosphate site, and an anion column along four edges of the unit cell [24]. Indeed, HAP turned out to be very efficient in immobilizing heavy metals in the environment, especially for Cd(II), and Pb(II) [4–6, 24, 27]. So far, dissolution-precipitation, cation exchange, and surface complexation have been proved to be the significant mechanisms of heavy metals immobilization by HAP [2, 6].…”

Section: Introductionmentioning

confidence: 99%

“…HAP is the most abundant phosphate mineral in the geological environment. Natural HAP minerals contain mainly calcium and phosphorus (Ca 10 (PO 4 ) 6 (OH) 2 ) [2, 27]. In addition, HAP is a kind of green and environment-friendly material, which possesses a robust hexagonal atomic framework based on two distinct calcium sites (Ca(I), Ca(II)), a tetrahedral-phosphate site, and an anion column along four edges of the unit cell [24].…”

Section: Introductionmentioning

confidence: 99%

“…When it comes to some metal ions such as Cd [4, 6, 14, 26, 27], Zn [14, 20], or Ni [18, 29], the cation exchange mechanism is rapid and more favorable to take place than a dissolution-precipitation process because the ionic radii of these metals are similar or smaller than Ca 2+ (0.099 nm) [2, 6]. Moreover, according to the former studies, Ca deficiency promotes the adsorption of heavy metals on HAP [27]. Thereinto, a series of studies have confirmed Ca/P molar ratio of HAP acted as a key factor in the adsorption mechanisms [19, 20, 23, 27, 29].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Behaviors and Mechanism of Ni(II) Adsorption at the Hydroxyapatite-Water Interface: Effect of Particle Size

Zhao

Pan

et al. 2022

Adsorption Science & Technology

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Hydroxyapatite (HAP) was a highly efficient decontamination material for its strong adsorption capacity used in the immobilization of heavy metals, while the particle-size effect was insufficiently investigated during the sorption process. In the present study, the mechanisms of nickel (Ni(II)) adsorption on HAPs with two different particle sizes were investigated by combing batch experiments, desorption, and XRD analysis. The results showed that the adsorption capacity of 20 nm HAP (nano-HAP) was much higher than that of 12 μm HAP (micro-HAP). It was noticed that the results of the present study also clarified the distinct mechanisms in each adsorption process. As for micro-HAP, Ni2+ adsorbed through slow diffusion and replacement with Ca2+ and then incorporated in the lattice at pH between 6.5 and 9.0, which was confirmed by the results of kinetics, thermodynamics, and desorption. And a more compact crystalline structure and irreversible desorption behavior of micro-HAP after Ni(II) adsorption was confirmed by results of XRD and desorption isotherms, respectively. At pH > 9.0 , lattice incorporation and precipitation controlled together. However, for nano-HAP, the sharp increase of Ni(II) adsorption and ionic strength dependent at pH 6.5 to 9.0 revealed that the dominant mechanisms were ionic exchange and inner-sphere complexation. XRD results showed that characteristic peaks of cassidyite appeared in Ni(II)-loading nano-HAP. At pH > 9.0 , a precipitate of Ni(II) was the dominant mechanism. The experimental finds demonstrated that nanoscale HAP was a more fast, efficient, and desorbable adsorbent than micro-HAP for Ni(II) removal. These findings would be favorable for investigating the removal mechanisms of heavy metals on the HAP materials and designing the synthesis methods.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on the Behaviors and Mechanism of Ni(II) Adsorption at the Hydroxyapatite-Water Interface: Effect of Particle Size

Zhao

Pan

et al. 2022

Adsorption Science & Technology

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“…These factors are significant because of the potential for immobilization of toxic elements by HA as an important component of soils, bones, and milk. Zhang et al [ 15 ] focused on the removal performance of the three HA powders towards Cd(II) under a series of environmental conditions such as contact time, ionic strength, coexisting inorganic electrolyte ions and organic components, initial Cd(II) concentration, and competing heavy metal ions. The experimental findings demonstrated the significant application potential of Ca-deficient HA material for the cost-effective treatment of Cd(II)-polluted water systems.…”

Section: Introductionmentioning

confidence: 99%

The Removal of Pertechnetate from Aqueous Solution by Synthetic Hydroxyapatite: The Role of Reduction Reagents and Organic Ligands

Rosskopfová

Víglašová

Galamboš

et al. 2023

IJERPH

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The use of knowledge from technetium radiochemistry (even from nuclear medicine applications) allows us to select an sorbent for 99mTc radionuclide sorption, which is hydroxyapatite. Using radioisotope indication, the 99mTcO₄− sorption process on synthetic hydroxyapatite was studied by the batch method in the presence of SnCl2 and FeSO4 reducing agents. The complexing organic ligands' effect on the 99mTcO₄− sorption under reducing conditions was investigated. In the presence of Sn2+ ions without the addition of organic ligand, the sorption percentage reached above 90% independently of the environment. In the presence of Fe2+ ions without the addition of organic ligand, the sorption of 99mTcO₄− was significantly lower and was at approximately 6%, depending on the concentration of Fe2+ ions in solution. The effect of complexing organic ligands on the 99mTcO₄− sorption on hydroxyapatite from the aqueous solution, acetate buffer and phosphate buffer decreases in the following order for Sn2+: oxalic acid > ethylenediaminetetraacetic acid > ascorbic acid. In the presence of Fe2+ ions without organic ligands, the sorption reached up to 15% depending on the composition of the solution. The addition of oxalic acid and ascorbic acid increased the sorption up to 80%. The ethylenediaminetetraacetic acid had no significant effect on the sorption of technetium on hydroxyapatite.

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Synergistic enhanced passivation of phosphorus and cadmium in sediment by Ca/Al co-modified biochar

Zhang,

Wang,

Wang

et al. 2023

Chemical Engineering Journal

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New strumming sleight for old tunes: Exploration on the sorption mechanisms of Cd(II) by hydroxyapatite synthesized with different molar Ca/P ratios

Cited by 5 publications

References 59 publications

Study on the Behaviors and Mechanism of Ni(II) Adsorption at the Hydroxyapatite-Water Interface: Effect of Particle Size

Study on the Behaviors and Mechanism of Ni(II) Adsorption at the Hydroxyapatite-Water Interface: Effect of Particle Size

The Removal of Pertechnetate from Aqueous Solution by Synthetic Hydroxyapatite: The Role of Reduction Reagents and Organic Ligands

Synergistic enhanced passivation of phosphorus and cadmium in sediment by Ca/Al co-modified biochar

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