Cadmium fixation by synthetic hydroxyapatite in aqueous solution—Thermal behaviour

Marchat, David; Bernache‐Assollant, Didier; Champion, Éric

doi:10.1016/j.jhazmat.2006.02.040

Cited by 76 publications

(51 citation statements)

References 7 publications

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“…For the both apatites in the first few hours immoblization rate is very high and then it slightly decreases. This is in agreement with literature (Marchat et al 2007). The cadmium concentration equilibrium was not achieved even after 2 months of the reaction which was also reported by Fedoroff et al (1999).…”

Section: Apatites Dissolutionsupporting

confidence: 94%

“…It is well established in literature that cadmium uptake by HAP is a result of adsorption of cadmium on apatite surface followed by ion exchange with calcium (Jeanjean et al 1996, McGrellis et al 2001, Lusvardi et al 2002, Marchat et al 2007). However, our results show direct evidence of dissolution-precipitation mechanism for both minerals.…”

Section: Sem Analysesmentioning

confidence: 99%

“…Equilibria in water and soil solutions are mainly controlled by sorption/desorption and crystallization/dissolution processes. Therefore a promising way of eliminating mobile metals from soils is to convert them into stable metal phosphates by addition of soluble or insoluble phosphates (Levi Minzi & Petruzzelli 1984, Ma et al 1993, Ruby et al 1994, Xu & Schwartz 1994, Ma et al 1995, Cotter-Howells 1996, Lambert et al 1997, Zhang et al 1997, Fedoroff et al 1999, Shashkova et al 1999, Manecki et al 2000b, McGowen et al 2001, McGrellis et al 2001, Lusvardi et al 2002, Basta McGowen 2004, Lundager et al 2004, Raicevic et al 2005, Manecki et al 2006, Marchat et al 2007, Matusik et al 2008. This method, which is well known in the literature as in situ phosphate formation has convincing advantages.…”

Section: Introductionmentioning

confidence: 99%

“…The literature devoted to this subject focuses mainly on the interaction of cadmium with hydroxylapatite revealing many new details (Fedoroff et al 1999, McGrellis et al 2001, Lusvardi et al 2002, Lundager et al 2004, Raicevic et al 2005, Marchat et al 2007. However information about fixation of cadmium by fluorapatite particles is scattered and uncomplete.…”

Section: Introductionmentioning

confidence: 99%

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Aqueous cadmium removal by hydroxylapatite and fluoroapatite

Matusik¹,

Bajda²,

Manecki³

2012

geol

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Reducing the bioavailability of toxic heavy metals in groundwaters and urban soils by phosphate addition is an effective technique described in the literature. It is based on the reaction between metal ions and phosphates and results in the precipitation of metal substituted phosphate phases. The formed phosphates are highly insoluble and thermodynamically stable over almost entire pH and Eh range. In the presented study the efficiency and mechanism of cadmium uptake by synthetic hydroxylapatite and natural fluoroapatite was examined within the pH range of 3 7 for different reaction times (2 1440 hours). The solids after reactions were characterized by XRD and SEM-EDS. Percentage reduction of cadmium concentration in the experiments with fluoroapatite and hydroxylapatite, regardless of pH, did not exceed 17% and 25%, respectively. Cadmium uptake from the solution mainly resulted from the formation of cadmium phosphates and/or Ca-Cd phosphate solid solutions on the apatites surface. The release rate of phosphate ions by hydroxylapatite was relatively high. This promoted crystallization of a large number of small crystals. In turn dissolution of fluoroapatite was slower and thus the formation of large crystals was observed. There was no clear evidence for cadmium-calcium ion-exchange mechanism.

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Section: Apatites Dissolutionsupporting

confidence: 94%

Section: Sem Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aqueous cadmium removal by hydroxylapatite and fluoroapatite

Matusik¹,

Bajda²,

Manecki³

2012

geol

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“…Among them, let us quote Mg [56], Si [57], Cd [58], Sr [59] and Pb [60]. More precisely, Zhu et al [61] founded that the metal ions of Pb 2+ , Sr 2+ and Cd 2+ preferentially occupied Ca[II] sites in the apatite structure (two occupation sites exist as gathered in Table 1) .…”

Section: Considering Substitution Processesmentioning

confidence: 99%

Diffraction techniques and vibrational spectroscopy opportunities to characterise bones

et al. 2009

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Heavy elements in urinary stones

et al. 2007

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The presence and role of heavy metals in urinary stones is debated. We investigated the distribution of trace heavy metals in 78 calculi of well-defined composition by means of microfluorescence X analysis using synchrotron radiation. Seven elements were identified, the most abundant being Zn and Sr which together accounted for 91% of the heavy metal content of stones. The other heavy metals were Fe, Cu, Rb, Pb and Se. Zn and Sr were virtually confined to calcium-containing stones, whereas only trace amounts were found in uric acid or cystine stones. Among calcium stones, Zn and Sr were more abundant in calcium phosphate than in calcium oxalate stones and, in the latter, in weddellite than in whewellite stones. Fe, Cu and Rb were much less abundant and also found mainly in calcium stones. Pb was significantly less abundant than in previous studies, thus suggesting a rarefaction of Pb in the environment, and appreciable amounts of Se were found only in cystine stones. In conclusion, the preponderance of Zn and Sr, both bivalent ions, in calcium-containing stones suggests a substitution process of calcium by metal ions with similar charge and radius rather than a contribution of the metals to stone formation. Further studies are needed to examine the relationships between urine concentration in calcium or other solutes and the amount of Zn and Sr in calcium stones.

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Cadmium fixation by synthetic hydroxyapatite in aqueous solution—Thermal behaviour

Cited by 76 publications

References 7 publications

Aqueous cadmium removal by hydroxylapatite and fluoroapatite

Aqueous cadmium removal by hydroxylapatite and fluoroapatite

Diffraction techniques and vibrational spectroscopy opportunities to characterise bones

Heavy elements in urinary stones

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