Apatite and Portland/apatite composite cements obtained using a hydrothermal method for retaining heavy metals

Domínguez, M.I.; Carpéna, J.; Borschnek, D.; Centeno, M.A.; Odriozola, J.A.; Rose, Jérôme

doi:10.1016/j.jhazmat.2007.04.091

Cited by 23 publications

(10 citation statements)

References 42 publications

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“…Particularly, the change was distinct at 80°C where most particles were of flat-needle-like morphology (more details in Supplementary data 2). This morphology was characteristic for apatitic compounds formed under hydrothermal conditions, as observed in previous works [32][33][34]. Particle size distribution was also analyzed in order to better understand the formation of particles ( Fig.…”

Section: Sem and Particle Size Distributionsupporting

confidence: 68%

Carbonate-containing apatite (CAP) synthesis under moderate conditions starting from calcium carbonate and orthophosphoric acid

Minh

Trân²,

Nzihou³

et al. 2013

Materials Science and Engineering: C

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The synthesis of carbonate-containing apatite (CAP) from calcium carbonate and orthophosphoric acid under moderate conditions was investigated. In all cases, complete precipitation of orthophosphate species was observed. The reaction temperature influenced strongly the decomposition of calcium carbonate and therefore the composition of formed products. The reaction temperature of 80 °C was found to be effective for the complete decomposition of calcium carbonate particles after 48 h of reaction. Infra-red spectroscopy (IR), nuclear magnetic resonance (NMR), thermogravimetry/mass spectroscopy (TG-MS) coupling, and X-ray diffraction (XRD) characterizations allowed the identification of the composition of formed products. By increasing the reaction temperature from 20 °C to 80 °C, the content of A-type CAP increased and that of B-type CAP decreased, according to the favorable effect of temperature on the formation of A-type CAP. The total amount of carbonate content incorporated in CAP's structure, which was determined by TG-MS analysis, increased with the reaction temperature and reached up to 4.1% at 80 °C. At this temperature, the solid product was mainly composed of apatitic components and showed the typical flat-needle-like structure of CAP particles obtained in hydrothermal conditions. These results show an interesting one-step synthesis of CAP from calcium carbonate and orthophosphoric acid as low cost but high purity starting materials.

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Section: Sem and Particle Size Distributionsupporting

confidence: 68%

Carbonate-containing apatite (CAP) synthesis under moderate conditions starting from calcium carbonate and orthophosphoric acid

Minh

Trân²,

Nzihou³

et al. 2013

Materials Science and Engineering: C

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“…As can be seen in the figure, the retention capacity decreases rapidly during the first 80 min, reaching a retention level of 60 and 50 % for apatite gel with a concentration of 5 and 3 %, respectively. These results obtained by the experimental apparatus are consistent with previous studies that confirmed the capacity of hydroxyapatite to retain heavy metals, such as Fe, Mg, Cr, Mn, Pb [37,38]. The adsorption of the solution of copper ions on surfaces of hydroxyapatite has been studied in the literature.…”

Section: Formulation Of Reactive Materials Consisting Of Sand Apatitsupporting

confidence: 90%

Formulation of a Permeable Reactive Mixture for Groundwater Remediation Based on an Industrial Co-product: Permeability and Copper Retention Study

Belhaj-Trabelsi

Lafhaj

Zakaria

et al. 2015

Waste Biomass Valor

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The objective of this research is to formulate a permeable material based on apatite gel having the ability to retain heavy metals, to be used in a permeable reactive barrier (PRB), an in situ passive groundwater treatment technology. This new material is produced from non-toxic waste in the research laboratory of a chemical company. It is characterised by a thixotropic behaviour and a high ion exchange capacity. The apatite gel is the active agent of the reactive material; it ensures the retention of heavy metals by ion exchange. Sand and an organic binder are also incorporated into the mixture, providing both high permeability and mechanical strength to the mixtures. An original experimental apparatus intended for measuring both water permeability and the retention of heavy metals has been specially designed and developed for this study. The mixture consisting of 95 % silica sand, 5 % apatite gel and 3 % epoxy was qualified as a suitable PRB mixture, due its high permeability, its good retention capacity and its acceptable mechanical strength.

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“…In some areas, a growth of a few needle-shaped crystals was observed ( Fig. 6g and 6h) and could be related to the formation of hydroxyapatite (Domínguez et al, 2008); as seen by XRD in Zn-doped samples (Fig. 2c).…”

Section: Curing Conditionmentioning

confidence: 79%

Treatment of toxic metal aqueous solutions: Encapsulation in a phosphate-calcium aluminate matrix

Fernández

Navarro-Blasco

Durán

et al. 2014

Journal of Environmental Management

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Polyphosphate-modified calcium aluminate cement matrices were prepared by using aqueous solutions polluted with toxic metals as mixing water to obtain wastecontaining solid blocks with improved management and disposal. Synthetically contaminated waters containing either Pb or Cu or Zn were incorporated into phosphoaluminate cement mortars and the effects of the metal's presence on setting time and mechanical performance were assessed. Sorption and leaching tests were also executed and both retention and release patterns were investigated. For all three metals, high uptake capacities as well as percentages of retention larger than 99.9% were measured. Both Pb and Cu were seen to be largely compatible with this cementitious matrix, rendering the obtained blocks suitable for landfilling or for building purposes. However, Zn spoilt the compressive strength values because of its reaction with hydrogen phosphate anions, hindering the development of the binding matrix.

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Apatite and Portland/apatite composite cements obtained using a hydrothermal method for retaining heavy metals

Cited by 23 publications

References 42 publications

Carbonate-containing apatite (CAP) synthesis under moderate conditions starting from calcium carbonate and orthophosphoric acid

Carbonate-containing apatite (CAP) synthesis under moderate conditions starting from calcium carbonate and orthophosphoric acid

Formulation of a Permeable Reactive Mixture for Groundwater Remediation Based on an Industrial Co-product: Permeability and Copper Retention Study

Treatment of toxic metal aqueous solutions: Encapsulation in a phosphate-calcium aluminate matrix

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