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Processes of Removing Zinc from Water using Zero-Valent Iron.

Suponik T, Winiarski A, Szade J - Water Air Soil Pollut (2015)

Bottom Line: The BET surface area, the pH at point of zero charge (pHPZC), the ORP of the solutions, and the pH and chemical concentrations in the solutions have also been measured.Furthermore, the paper also considers the possibility of release of zinc from the precipitates to demineralised water in changing physicochemical and chemical conditions.In neutral and alkaline conditions, the adsorption occurred as an additional process.

View Article: PubMed Central - PubMed

Affiliation: Silesian University of Technology, Akademicka 2, 44-100 Gliwice, Poland.

ABSTRACT

Zero-valent iron has received considerable attention for its potential application in the removal of heavy metals from water. This paper considers the possibility of removal of zinc ions from water by causing precipitates to form on the surface of iron. The chemical states and the atomic concentrations of solids which have formed on the surface of zero-valent iron as well as the type of the deposited polycrystalline substances have been analyzed with the use of X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), respectively. The BET surface area, the pH at point of zero charge (pHPZC), the ORP of the solutions, and the pH and chemical concentrations in the solutions have also been measured. Furthermore, the paper also considers the possibility of release of zinc from the precipitates to demineralised water in changing physicochemical and chemical conditions. In a wide range of pH values, Zn x Fe3 - x O4 (where x ≤ 1) was the main compound resulting from the removal of zinc in ionic form from water. In neutral and alkaline conditions, the adsorption occurred as an additional process.

No MeSH data available.


XRD graphs of iron samples: a before the batch tests; b after the first batch tests for the initial pH of the solution amounting to 4.5, 7.0, and 9.5; and c after the second batch tests for the initial pH of the solution amounting to 4.5, 7.0, and 9.5.
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Fig1: XRD graphs of iron samples: a before the batch tests; b after the first batch tests for the initial pH of the solution amounting to 4.5, 7.0, and 9.5; and c after the second batch tests for the initial pH of the solution amounting to 4.5, 7.0, and 9.5.

Mentions: Figure 1 presents the diffraction of X-rays on iron samples before and after the first and second batch tests. Based on Fig. 1a, it may be claimed that iron was found on the surface of iron samples assessed before the batch tests (as it was expected). The network parameters of pure iron are similar (very close) to the parameters of many alloys in which iron is the main component.Fig. 1


Processes of Removing Zinc from Water using Zero-Valent Iron.

Suponik T, Winiarski A, Szade J - Water Air Soil Pollut (2015)

XRD graphs of iron samples: a before the batch tests; b after the first batch tests for the initial pH of the solution amounting to 4.5, 7.0, and 9.5; and c after the second batch tests for the initial pH of the solution amounting to 4.5, 7.0, and 9.5.
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4594089&req=5

Fig1: XRD graphs of iron samples: a before the batch tests; b after the first batch tests for the initial pH of the solution amounting to 4.5, 7.0, and 9.5; and c after the second batch tests for the initial pH of the solution amounting to 4.5, 7.0, and 9.5.
Mentions: Figure 1 presents the diffraction of X-rays on iron samples before and after the first and second batch tests. Based on Fig. 1a, it may be claimed that iron was found on the surface of iron samples assessed before the batch tests (as it was expected). The network parameters of pure iron are similar (very close) to the parameters of many alloys in which iron is the main component.Fig. 1

Bottom Line: The BET surface area, the pH at point of zero charge (pHPZC), the ORP of the solutions, and the pH and chemical concentrations in the solutions have also been measured.Furthermore, the paper also considers the possibility of release of zinc from the precipitates to demineralised water in changing physicochemical and chemical conditions.In neutral and alkaline conditions, the adsorption occurred as an additional process.

View Article: PubMed Central - PubMed

Affiliation: Silesian University of Technology, Akademicka 2, 44-100 Gliwice, Poland.

ABSTRACT

Zero-valent iron has received considerable attention for its potential application in the removal of heavy metals from water. This paper considers the possibility of removal of zinc ions from water by causing precipitates to form on the surface of iron. The chemical states and the atomic concentrations of solids which have formed on the surface of zero-valent iron as well as the type of the deposited polycrystalline substances have been analyzed with the use of X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), respectively. The BET surface area, the pH at point of zero charge (pHPZC), the ORP of the solutions, and the pH and chemical concentrations in the solutions have also been measured. Furthermore, the paper also considers the possibility of release of zinc from the precipitates to demineralised water in changing physicochemical and chemical conditions. In a wide range of pH values, Zn x Fe3 - x O4 (where x ≤ 1) was the main compound resulting from the removal of zinc in ionic form from water. In neutral and alkaline conditions, the adsorption occurred as an additional process.

No MeSH data available.