Separation of binary heavy metals from aqueous solutions by nanofiltration and characterization of the membrane using Spiegler–Kedem model

Murthy, Z.V.P.; Chaudhari, Latesh B.

doi:10.1016/j.cej.2008.12.023

Cited by 132 publications

(62 citation statements)

References 31 publications

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“…Various methods are being used to remove heavy metal ions, e.g., chemical precipitation, 8 ion exchange, 9 adsorption, 10 and membrane separation. 11 Flocculation of heavy metal ions, however, is generally inefficient, because it is difficult to accumulate the dissolving metal ions into large flocs. Therefore, flocculation has to be carried out in combination with another purification process.…”

Section: Introductionmentioning

confidence: 99%

Water soluble EDTA-linked chitosan as a zwitterionic flocculant for pH sensitive removal of Cu(ii) ion

Fujita

Sakairi

2016

RSC Adv.

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A linear and non-crosslinked polymer, EDTA-linked chitosan (ED-ch), was synthesized by N-acylation of chitosan with EDTA (ethylenediaminetetraacetic acid) monoanhydride under from acidic to slightly basic aqueous conditions. The degree of substitution (D.S.) of EDTA residues in the product was changeable by the stoichiometry of the acylation reagent, and the structure was confirmed by elemental analysis, FT-IR, 1 H and 13 C NMR spectroscopy. The newly introduced functional group in ED-ch provided properties as a strong chelating reagent and an amphoteric polyelectrolyte. It was found that ED-ch had good water solubility in both acidic and basic region and precipitated in the narrow pH region. Applicability of ED-ch to removal of heavy metal ions by flocculation was proven by a model experiment using 10 ppm Cu(II) solution.Simple procedure, mixing ED-ch with D.S. 41% and 70%, and subsequent pH adjustment (4.5 and 2.5) and centrifugal separation of the flocs formed, was shown to remove almost complete Cu(II) from aqueous solution, respectively. The residual Cu(II) concentration after these flocculation/separation process with ED-ch reached 0.03 ppm.

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Section: Introductionmentioning

confidence: 99%

Water soluble EDTA-linked chitosan as a zwitterionic flocculant for pH sensitive removal of Cu(ii) ion

Fujita

Sakairi

2016

RSC Adv.

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“…NF process benefits from ease of operation, reliability and comparatively low energy consumption as well as high efficiency of pollutant removal [30]. In recent years, Murthy and Chaudhari [31,32] devoted a lot in the removal of heavy metal ions using NF membrane. They reported the application of a thin-film composite polyamide NF membrane for the rejection of nickel ions from aqueous wastewater [31,32].…”

Section: +mentioning

confidence: 99%

“…In recent years, Murthy and Chaudhari [31,32] devoted a lot in the removal of heavy metal ions using NF membrane. They reported the application of a thin-film composite polyamide NF membrane for the rejection of nickel ions from aqueous wastewater [31,32]. The maximum observed rejection of nickel is found to be 98% and 92% for an initial feed concentration of 5 and 250 mg/dm 3 , respectively.…”

Section: +mentioning

confidence: 99%

Inorganic Micropollutants Removal by Means of Membrane Processes - State of the Art

Bodzek¹

2013

Ecological Chemistry and Engineering S

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A number of inorganic anions and metals, especially heavy metals, at certain conditions, have been found in potentially harmful concentrations in numerous water sources. The maximum permissible levels of these compounds, in drinking water and wastewaters discharged to environment, set by the WHO and a number of countries are very low (from µg/dm 3 to a few mg/dm 3 ). Several common treatment technologies, which are nowadays used for removal of inorganic contaminants from natural water supplies, represent serious exploitation problems. Membrane processes such as reverse osmosis and nanofiltration, ultrafiltration and microfiltration in integrated systems, Donnan dialysis and electrodialysis as well as membrane bioreactors, if properly selected, offer the advantage of producing high quality drinking water without inorganic substances as well as purified wastewater which can be drained off to natural water sources.

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“…After analysing of the literatures data 15- 25 we have stated that both theoretical and experimental works concerning the ions separation mechanism into nanofi ltration membranes are not still satisfactory and require further actions. Recently the modelling of nanofi ltration of salt solution has been widely investigated [15][16][17][18][19][20][21][22][23][24][25] . The mass transfer through the membrane was described by different models such as Kedem-Katchalsky 19, 20 or Spiegler-Kedem 19, 21, 25 .…”

Section: Introductionmentioning

confidence: 99%

“…Recently the modelling of nanofi ltration of salt solution has been widely investigated [15][16][17][18][19][20][21][22][23][24][25] . The mass transfer through the membrane was described by different models such as Kedem-Katchalsky 19, 20 or Spiegler-Kedem 19, 21, 25 . However none of the models used took into consideration a density of membrane surface charge, which, as it was mentioned, is one of the main factors in the case of nanofi ltration of salt solutions at low pH…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr(III) ions from salt solution by nanofiltration: experimental and modelling analysis

Kowalik-Klimczak

Zalewski

Gierycz

2016

Polish Journal of Chemical Technology

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The aim of this study was experimental and modelling analysis of the nanofi ltration process used for the removal of chromium(III) ions from salt solution characterized by low pH. The experimental results were interpreted with Donnan and Steric Partitioning Pore (DSP) model based on the extended Nernst-Planck equation. In this model, one of the main parameters, describing retention of ions by the membrane, is pore dielectric constant. In this work, it was identifi ed for various process pressures and feed compositions. The obtained results showed the satisfactory agreement between the experimental and modelling data. It means that the DSP model may be helpful for the monitoring of nanofi ltration process applied for treatment of chromium tannery wastewater.

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Separation of binary heavy metals from aqueous solutions by nanofiltration and characterization of the membrane using Spiegler–Kedem model

Cited by 132 publications

References 31 publications

Water soluble EDTA-linked chitosan as a zwitterionic flocculant for pH sensitive removal of Cu(ii) ion

Water soluble EDTA-linked chitosan as a zwitterionic flocculant for pH sensitive removal of Cu(ii) ion

Inorganic Micropollutants Removal by Means of Membrane Processes - State of the Art

Removal of Cr(III) ions from salt solution by nanofiltration: experimental and modelling analysis

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