Cadmium Uptake by Hydroxyapatite Synthesized in Different Conditions and Submitted to Thermal Treatment

Rocha, Nilce C.C. da; Campos, Reinaldo Calixto de; Rossi, Alexandre M.; Moreira, Elizabeth L.; Barbosa, Ademarlaudo Do F.; Moure, Gustavo T.

doi:10.1021/es0155940

Cited by 111 publications

(52 citation statements)

References 23 publications

(44 reference statements)

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“…With an increase in calcination temperature, the specific surface areas gradually decreased probably attributed to aggregation. 21) As expected the concentrations of trace elements (e.g., K, Na, Mg, Sr) are similar among the calcined FHAPs. Around 2.5 mass% K and 1.6 mass% Na were also found as impurities in FHAPs.…”

Section: Sorption Experimentssupporting

confidence: 73%

Ion Exchange Capacity of Sr<sup>2+</sup> onto Calcined Biological Hydroxyapatite and Implications for Use in Permeable Reactive Barriers

et al. 2012

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With the recent Fukushima incident, there is an urgent need to find cost effective and workable permeable reactive barrier (PRBs) for the remediation/retardation of problematic radionuclides. Catfish bones were calcined at various temperatures (4001100°C) to remove the organic matter (87.1 mg·g ¹1) and to change the structural properties of the hydroxyapatite (HAP). Increasing temperatures increased the HAP crystallinity as indicated by a decrease in lattice strain (0.0098 to 0.00135) and an increase in crystallite sizes (5.0 © 10 ¹8 to 7.7 © 10 ¹8 m). There was also an observed decrease in specific surface areas (98.9 to 0.99 m 2 ·g ¹1 ) and increase in particle sizes (50 to 1000 nm). The sorption densities of Sr 2+ decreased with increasing calcination temperatures, from 0.34 to 0.05 mmol·g ¹1. However, once normalized for surface area, the sorption densities increased from 1.8 to 5.9 mmol·m ¹2 . Overall, this research has important implications for the design of hydroxyapatite PRBs with higher calcination temperatures producing a more reactive material with larger particle sizes for increased permeability. Lower calcination temperatures produced amorphous HAP material, which released more aqueous PO 4 3¹ and resulted in the precipitation of strontium phosphates, ultimately reducing the permeability of PRBs.

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Section: Sorption Experimentssupporting

confidence: 73%

Ion Exchange Capacity of Sr<sup>2+</sup> onto Calcined Biological Hydroxyapatite and Implications for Use in Permeable Reactive Barriers

et al. 2012

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“…A dissolution-precipitation mechanism via the formation of pyromorphite-like mineral was used to explain the decrease in Pb availability in previous studies (Ma et al 1995;Chen et al 2007;Debela et al 2013). Da Rocha et al (2002 suggested that Cd immobilization could be associated with the ion exchange and complexation mechanisms.…”

Section: Changes In Available Heavy Metals In the Soilmentioning

confidence: 99%

Evaluation of different amendments and foliar fertilizer for immobilization of heavy metals in contaminated soils

et al. 2017

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Purpose The aim of this study was to evaluate the effectiveness of soil amendments and foliar fertilizer on Cd and Pb immobilization in contaminated soils. Materials and methods A field experiment was conducted in contaminated soils, wherein four amendments (sepiolite (SE), single superphosphate (SSP), triple super phosphate (TSP), calcium magnesium phosphate (CMP)) in combination with one foliar fertilizer (ZnSO 4 ) were investigated to reduce Cd and Pb bioavailability in calcareous soils. Total Cd and Pb concentrations in wheat, soil, and amendments were determined using inductively coupled plasma mass spectrometry. Available concentrations of Cd and Pb in soils were extracted using diethylenetriamine pentaacetic acid. Results and discussion The results indicated that application of these amendments and foliar fertilizer significantly decreased Cd availability in soils and Cd accumulation in wheat (P < 0.05); however, the soil amendments plus Zn fertilizer did not significantly decrease Cd and Pb concentrations in wheat. Compared with the control, application of soil amendments effectively reduced the available Cd and Pb in soils by 25.69~54.13% and 9.86~42.14%, respectively. Accordingly, the reduction of Cd and Pb concentrations in wheat grain by the soil amendments was 20.68~41.38% and 23.68~55.26%, respectively.Conclusions Among all the treatments, the addition of SE + SSP and SE + CMP exhibited the most efficiency in reducing Cd and Pb availability, respectively, in the soil.

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“…It is thermodynamically favorable for dissolved Pb to react with P for formation of insoluble Pb phosphate, but less for Zn and Cu to form Zn-and Cu-phosphates (Cao et al, 2009), so there are no obvious positive effects for Cu, Zn, Cd and Cr. Moreover, due to the formation of Ca-phosphate in the sludge, Cu and Cd can be slightly immobilized due to the ion exchange and complexation mechanisms as shown in Table 2 (Da Rocha et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

Immobilization of heavy metals in sludge using phosphoric acid and monobasic calcium phosphate

Tang

Zhou

Xie

2013

J. Zhejiang Univ. Sci. A

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Abstract:The purpose of this research is to investigate the potential of pre-treatment with phosphoric acid (PA) and monobasic calcium phosphate (MCP) for the stabilization of heavy metals in sludge and its bottom ash. The tannery sludge samples were collected in Wenzhou, China and heavily contaminated with heavy metals, such as Pb, Cr and so on. The samples were pre-treated with PA or MCP. Then XRD and TCLP tests were adopted as the evaluating methods to characterize the Pb, Cr, Cu, Zn and Cd immobilization in the pre-treated sludge and its bottom ash. The results showed that this treatment effectively immobilized Pb and Cd in the sludge, lightly stabilized the metal Cu, and adversely, enhanced the leachability of Zn. After incineration at 900 °C, Pb and Cr in the bottom ash of pre-treated sludge were significantly stabilized due to the formation of their highly thermostable phosphates and pyromorphite-like minerals during the incineration process. However, an increase of Cu and Zn solubility was observed which might be attributable to the acidification of sludge due to the addition of PA or MCP.

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Cadmium Uptake by Hydroxyapatite Synthesized in Different Conditions and Submitted to Thermal Treatment

Cited by 111 publications

References 23 publications

Ion Exchange Capacity of Sr<sup>2+</sup> onto Calcined Biological Hydroxyapatite and Implications for Use in Permeable Reactive Barriers

Ion Exchange Capacity of Sr<sup>2+</sup> onto Calcined Biological Hydroxyapatite and Implications for Use in Permeable Reactive Barriers

Evaluation of different amendments and foliar fertilizer for immobilization of heavy metals in contaminated soils

Immobilization of heavy metals in sludge using phosphoric acid and monobasic calcium phosphate

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