Removal of lead from aqueous solutions by natural phosphate

Mouflih, Mustapha; Aklil, A.; Jahroud, N.; Gourai, M.; Sebti, Saı̈d M.

doi:10.1016/j.hydromet.2005.12.011

Cited by 49 publications

(32 citation statements)

References 22 publications

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“…It is worth noting that the decrease from 0.280 to 0.255 g/L of suspended biosorbent, in solution containing about 200 mg Pb 2+ /L, leads to a situation from complete to almost half of the sorption performance achieved, revealing that there is an optimum bioapatite concentration, under uncontrolled pH condition, that could be applied. Regardless of particle size reduction and variation of final solution pH, this biological carbonated hydroxyapatite demonstrated large capacity to immobilize the lead ion from aqueous solution, in similar order of magnitude of published results using the synthetic material (e.g., 416.5 mg/g (Zhang et al 2010), 449.6 mg/g (Bailliez et al 2004), and 566 mg/g (Dybowska et al 2009)), natural (e.g., 131 mg/g (Mouflih et al 2006)), or biological (e.g., 103 mg/g (Dybowska et al 2009)) apatite-like compounds. Figure 4 shows the relation, in molar basis, between the amount of lead ion removed from the aqueous solution and the calcium released from the used bioapatite to the solution after reached the equilibrium condition.…”

Section: Sorption Experiments For Lead Ionssupporting

confidence: 67%

“…Therefore, we aim to evaluate the removal of divalent Pb 2+ , Cd 2+ , and Zn 2+ ions from aqueous solutions using calcium phosphate particles derived from fish bones (here, also called bioapatite or biosorbent). These metal elements are some of the most ubiquitous and hazardous environmental pollutants and represent typical heavy metals with wide presence in surface and ground waters, soils, and sediments originated by anthropogenic activity (Mouflih et al 2006;Smiciklas et al 2008). …”

Section: Introductionmentioning

confidence: 99%

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Water Remediation Using Calcium Phosphate Derived From Marine Residues

Silva

Costa

Vilar

et al. 2011

Water Air Soil Pollut

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The processing of natural resources in marine and freshwater ecosystems, directly operated by industries related to maritime sector, contributes annually to several million tons of waste. The reuse and economic recovery of this waste would be very desirable and profitable, either economically or environmentally. In this work, the remediation of hazardous divalent metal ions from aqueous solutions using biological apatites derived from marine residues was addressed. The biological apatite (calcium phosphate particles) was produced by heat treatment of fish bones. Experimental sorption studies of kinetics and equilibrium of the metal ions as well as an evaluation of competitive sorption behavior for lead immobilization were carried out in batch operation mode. The efficiency and mechanisms of lead sorption on two different particle sizes of calcium phosphate from aqueous solution were investigated. The results showed a high adsorption capacity of the biosorbent for Pb 2+ (above 370 mg/g ads. ), in opposition to Cd 2+ and Zn 2+ . For the case of low initial concentrations of the metal ion, reducing the biosorbent particles size increases the sorption rate. It was possible to verify that lead immobilization proceeds with a rapid surface complexation of the lead on the sorption sites before partial dissolution of calcium phosphate and formation of pyromorphitelike compounds. By the selectivity experiments, performed using binary systems-Pb/Cd and Pb/Znit was evidenced a competitive process between the divalent ions, which leads to a considerable decrease on the adsorption capacity of the adsorbent material for all the metals.

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Section: Sorption Experiments For Lead Ionssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Water Remediation Using Calcium Phosphate Derived From Marine Residues

Silva

Costa

Vilar

et al. 2011

Water Air Soil Pollut

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“…The removal of Pb from aqueous solution using natural phosphate rock was investigated by Mouflih et al (2006) reporting that the principal mechanism at low pH was dissolution of natural phosphate and precipitation of chloropyromorphite. The addition of phosphate rock to convert the soil Pb to the more stable pyromorphite was accomplished by several authors (Laperche et al 1997;Ma and Rao 1999;Hettiarachchi et al 2000;Basta et al 2001;Cao et al 2002;Lin et al 2005).…”

Section: Amendments With Phosphate Rockmentioning

confidence: 99%

Phosphates for Pb immobilization in soils: a review

2008

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In its soluble ionic forms, lead (Pb) is a toxic element occurring in waters and soils mainly as the result of human activities. The bioavailability of lead ions can be decreased by complexation with various materials in order to decrease their toxicity. Pb chemical immobilization using phosphate addition is a widely accepted technique to immobilize Pb from aqueous solution and contaminated soils. The application of different P amendments cause Pb in soils to shift from forms with high availability to the most strongly bound Pb fractions. The increase of Pb in the residual or insoluble fraction results from formation of pyromorphite Pb 5 (PO 4 ) 3 X where X = F, Cl, Br, OH, the most stable environmental Pb compounds under a wide range of pH and Eh natural conditions. Accidental pyromorphite ingestion does not yield bioavailable lead, because pyromorphite is insoluble in the intestinal tract. Numerous natural and synthetic phosphates materials have been used to immobilize Pb: apatite and hydroxyapatite, biological apatite, rock phosphate, soluble phosphate fertilizers such as monoammonium phosphate, diammonium phosphate, phosphoric acid, biosolids rich in P, phosphatic clay and mixtures. The identification of pyromorphite in phosphate amended soils has been carried out by different non destructive techniques such as X-ray diffraction, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy, X-ray absorption fine structure, transmission electron microscopy and electron microprobe analysis. The effectiveness of in situ Pb immobilization has also been evaluated by selective sequential extraction, by the toxicity leaching procedure and by a physiologically based extraction procedure simulating metal ingestion and gastrointestinal bioavailability to humans. Efficient Pb immobilization using P amendments requires increasing the solubility of the phosphate phase and of the Pb species phase by inducing acid conditions. Although phosphorus addition seems to be highly effective, excess P in soil and its potential effect on eutrophication of surface water, and the possibility of As enhanced leaching remains a concern. The use of mixed treatments may be a useful strategy to improve their effectiveness in reducing lead phyto-and bioavailability.

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“…The spontaneity of the adsorption process is indicated by the negative values of ΔG 0 . Since the adsorption increases with temperature rise, it is indicative of chemicaladsorption [36].…”

Section: Temperature Effectmentioning

confidence: 99%

Toxic Heavy Metal Ionsremoval From Wastewater Bynano-Magnetite: Case Study Nile River Water

2017

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NANO-MAGNETITE was used as an eco-friendly sorbent (without the usage of surfactants during the synthesis) for removing Pb(II), Cd(II) and Cr(III) from water and wastewater. A single 7 nm cubic phase for magnetite was ascertained by X-Rays diffraction (XRD) and high resolution transmission electron microscope (HRTEM).Field emission scanning electron microscopy (FESEM) image showed the agglomeration of magnetite particles upon adsorption. The Langmuir isotherm was used to estimate the maximum adsorption capacities of 576.4, 144.3 and 301.0 mg/g for Pb(II), Cd(II) and Cr(III), respectively.The adsorption mechanism followed a pseudo-second order kinetics.The studied competing cations and anions showed minor effects on the rate of adsorption.Magnetite with high adsorption ability adsorbed Pb(II), Cd(II) and Cr(III) from a ternary mixture as effectively as from their individual solutions. The presented sorbent can be regenerated by 1% HNO 3 with a recovery percent of 91.4 % and reused with an adsorption efficiency of 84.1 % compared to the freshly prepared magnetite. As an example of application, the nano-magnetite was used to decontaminate river water-samples from lead ions.

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Removal of lead from aqueous solutions by natural phosphate

Cited by 49 publications

References 22 publications

Water Remediation Using Calcium Phosphate Derived From Marine Residues

Water Remediation Using Calcium Phosphate Derived From Marine Residues

Phosphates for Pb immobilization in soils: a review

Toxic Heavy Metal Ionsremoval From Wastewater Bynano-Magnetite: Case Study Nile River Water

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