In-depth study of the mechanism of heavy metal trapping on the surface of hydroxyapatite

Ferri, Michele; Campisi, Sebastiano; Scavini, Marco; Evangelisti, Claudio; Carniti, P.; Gervasini, Antonella

doi:10.1016/j.apsusc.2018.12.264

Cited by 90 publications

(34 citation statements)

References 43 publications

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“…6 g) was added to the iron(III) nitrate solution and the suspension was kept under stirring for 15 minutes. This short time guarantees both preserving surface and structural properties of HAP, which is known to be sensitive to amorphization and it can dissolve under acidic condition, and hindering self‐agglomeration of Fe 3+ species. The obtained pale yellow samples were filtered, washed with deionized water, and dried at 120 °C overnight, finally calcined at 500 °C for 1 h at controlled rate (1 °C ⋅ min −1 ) under static air.…”

Section: Methodsmentioning

confidence: 99%

Functionalized Iron Hydroxyapatite as Eco‐friendly Catalyst for NH₃‐SCR Reaction: Activity and Role of Iron Speciation on the Surface

et al. 2020

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Eco‐friendly catalysts have been obtained by functionalizing hydroxyapatite (HAP) with iron (Fe/HAP), according to three preparative methods (flash ionic exchange, deposition‐precipitation, and impregnation). Fe/HAP samples (ca. 2–7 wt.% Fe) have been tested in the reaction of NOx reduction by ammonia (NH3‐SCR) in the 120–500 °C interval with different NH3/NO ratios (0.6–2) at fixed contact time (0.12 s). All Fe/HAP samples were active and selective in the NH3‐SCR reaction starting from ca. 350 °C. Better performances have been observed on catalysts prepared by deposition‐precipitation and impregnation (about 70 % of NOx conversion and selectivity to N2 higher than 95 % at 350 °C), where α‐Fe2O3 and 3D‐Fe2O3 nanoclusters were present, as indicated by Mössbauer and UV‐Vis‐DR spectroscopies. On the opposite, paramagnetic Fe3+ centres were the predominant species on samples prepared by flash ionic exchange. Further characterization techniques (XRPD, N2‐physisorption, acidity by NH3 adsorption, and H2‐TPR) have concurred to elucidate Fe‐sitting HAP and structure‐activity relationships.

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Section: Methodsmentioning

confidence: 99%

Functionalized Iron Hydroxyapatite as Eco‐friendly Catalyst for NH₃‐SCR Reaction: Activity and Role of Iron Speciation on the Surface

et al. 2020

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“…There are numerous publications proving that synthetic hydroxyapatite can be effectively used as an adsorbent in wastewater and contaminated soil treatment (Bernalte et al 2019 ; Panneerselvam et al 2019 ; Campisi et al 2018 ; Ferri et al 2019 ; Das and Dhar 2020 ). It was found that the heavy metal removal from the solution depends on HA density, crystallinity, composition and specific surface area, as well as metal ion concentration, pH, temperature, rate of addition and ligand presence in the solution (Campisi et al 2018 ; Ferri et al 2019 ). Moreover, the mechanism of adsorption is connected with several phenomena like ion exchange, surface complexation and dissolution-precipitation processes responsible for creation of new, stable forms of calcium phosphates (Ferri et al 2019 ).…”

Section: Introductionmentioning

confidence: 99%

“…It was found that the heavy metal removal from the solution depends on HA density, crystallinity, composition and specific surface area, as well as metal ion concentration, pH, temperature, rate of addition and ligand presence in the solution (Campisi et al 2018 ; Ferri et al 2019 ). Moreover, the mechanism of adsorption is connected with several phenomena like ion exchange, surface complexation and dissolution-precipitation processes responsible for creation of new, stable forms of calcium phosphates (Ferri et al 2019 ).…”

Section: Introductionmentioning

confidence: 99%

The preparation of calcium phosphate adsorbent from natural calcium resource and its application for copper ion removal

Kalbarczyk

Szcześ

Sternik

2020

Environ Sci Pollut Res

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Using the hen eggshells (biowaste) as a source of calcium and an environmentally friendly approach, the nanopowder composed of 74% of hydroxyapatite (HA) and 26% of β-tricalcium phosphate (β-TCP) was obtained. Due to the maximum reduction of the stages associated with the use of chemicals and energy, this method can be considered as economically and environmentally friendly. A well-developed surface area and the negative zeta potential at pH above 3.5 indicate good adsorption properties of this material. The obtained material shows high adsorption capacity towards Cu 2+ ions, i.e. 105.4 mg/g at pH 5. Good fit of the Langmuir adsorption model and the pseudo-second-order kinetic model may indicate chemical adsorption probably due to the electrostatic interactions between the Cu 2+ cations and the negatively charged phosphate and hydroxyl groups on the material surface.

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“…Apatite has been utilized in wastewater treatment owing to its low water solubility, good adsorption characteristics, stable in reducing and oxidizing environments, easy preparation, facile modification, environmental-friendly, and low secondary pollution. Therefore, several studies have used apatites to remove aqueous heavy metals via ion exchange, surface complexation and dissolution/precipitation [ 6 , 7 ]. Nanoparticles have been studied extensively for heavy metal removal due to their high specific surface area and excellent adsorption ability [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cu(II) by Poly-γ-glutamate/Apatite Nanoparticles

Chen

Zeng

2021

Polymers

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Poly-γ-glutamate/apatite (PGA-AP) nanoparticles were prepared by chemical coprecipitation method in the presence of various concentrations of poly-γ-glutamate (γ-PGA). Powder X-ray diffraction pattern and energy-dispersive spectroscopy revealed that the main crystal phase of PGA-AP was hydroxyapatite. The immobilization of γ-PGA on PGA-AP was confirmed by Fourier transform infrared spectroscopy and the relative amount of γ-PGA incorporation into PGA-AP was determined by thermal gravimetric analysis. Dynamic light scattering measurements indicated that the particle size of PGA-AP nanoparticles increased remarkably with the decrease of γ-PGA content. The adsorption of aqueous Cu(II) onto the PGA-AP nanoparticles was investigated in batch experiments with varying contact time, solution pH and temperature. Results illustrated that the adsorption of Cu(II) was very rapid during the initial adsorption period. The adsorption capacity of PGA-AP nanoparticles for Cu(II) was increased with the increase in the γ-PGA content, solution pH and temperature. At a pH of 6 and 60 °C, a higher equilibrium adsorption capacity of about 74.80 mg/g was obtained. The kinetic studies indicated that Cu(II) adsorption onto PGA-AP nanoparticles obeyed well the pseudo-second order model. The Langmuir isotherm model was fitted well to the adsorption equilibrium data. The results indicated that the adsorption behavior of PGA-AP nanoparticles for Cu(II) was mainly a monolayer chemical adsorption process. The maximum adsorption capacity of PGA-AP nanoparticles was estimated to be 78.99 mg/g.

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In-depth study of the mechanism of heavy metal trapping on the surface of hydroxyapatite

Cited by 90 publications

References 43 publications

Functionalized Iron Hydroxyapatite as Eco‐friendly Catalyst for NH₃‐SCR Reaction: Activity and Role of Iron Speciation on the Surface

Functionalized Iron Hydroxyapatite as Eco‐friendly Catalyst for NH₃‐SCR Reaction: Activity and Role of Iron Speciation on the Surface

The preparation of calcium phosphate adsorbent from natural calcium resource and its application for copper ion removal

Adsorption of Cu(II) by Poly-γ-glutamate/Apatite Nanoparticles

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In-depth study of the mechanism of heavy metal trapping on the surface of hydroxyapatite

Cited by 90 publications

References 43 publications

Functionalized Iron Hydroxyapatite as Eco‐friendly Catalyst for NH3‐SCR Reaction: Activity and Role of Iron Speciation on the Surface

Functionalized Iron Hydroxyapatite as Eco‐friendly Catalyst for NH3‐SCR Reaction: Activity and Role of Iron Speciation on the Surface

The preparation of calcium phosphate adsorbent from natural calcium resource and its application for copper ion removal

Adsorption of Cu(II) by Poly-γ-glutamate/Apatite Nanoparticles

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Functionalized Iron Hydroxyapatite as Eco‐friendly Catalyst for NH₃‐SCR Reaction: Activity and Role of Iron Speciation on the Surface

Functionalized Iron Hydroxyapatite as Eco‐friendly Catalyst for NH₃‐SCR Reaction: Activity and Role of Iron Speciation on the Surface