Preparation and characterization of melamine-formaldehyde-dtpa chelating resin and its use as an adsorbent for heavy metals removal from wastewater

A. Baraka, P.J. Hall, M. Heslop

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Abstract

Melamine-formaldehyde-diethylenetriaminepentaacetic acid (MF-DTPA) resin was prepared as a new adsorbent for removing heavy metals from wastewater effluents. The resin was synthesised by anchoring the chelating agent diethylenetriaminepentaacetic acid (DTPA) to melamine via amide covalent bond during melamine-formaldehyde condensation reaction in an acidic aqueous medium. The effects of reaction parameters (temperature, acidity, and water content) on resin characteristics (water regain, rigidity, DTPA functionality, and porosity) were monitored to specify the best synthesis conditions. The resin was chemically characterized using infrared spectroscopy (FTIR), elemental analysis (EA), thermal programmed decomposition-mass spectrometry (TPD-MS), solid-state 13C NMR and 15N NMR, and was morphologically characterized using N2 gas adsorption/desorption (BET analysis) and field emission-scanning electron microscopy (FE-SEM). The water regain factor was also calculated to determine hydrophilic character of the resin. The simultaneous adsorption performance of MF-DTPA resin towards selected heavy metals, Co(II), Cd(II), Zn(II), and Cu(II), was discussed. Quantitative analysis for adsorption was conducted using atomic absorption to investigate the kinetics, adsorption isotherm and thermodynamics of the removal process considering pH, initial concentration, temperature, and contact time as controlling parameters. The mechanism of adsorption was suggested based on experimental results. This work shows the potential application of the MF-DTPA resin for removing heavy metals from wastewaters.
LanguageEnglish
Pages585-600
Number of pages15
JournalReactive and Functional Polymers
Volume67
Issue number7
DOIs
Publication statusPublished - Jul 2007

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Melamine
Waste Water
Heavy Metals
Chelation
formaldehyde
Formaldehyde
Adsorbents
Heavy metals
Adsorption
resin
DTPA
Wastewater
Resins
heavy metal
wastewater
Acids
adsorption
Regain
Water
nuclear magnetic resonance

Keywords

  • melamine-formaldehyde-DTPA resin
  • chelating adsorption
  • heavy metal
  • kinetics
  • isotherm
  • thermodynamics

Cite this

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title = "Preparation and characterization of melamine-formaldehyde-dtpa chelating resin and its use as an adsorbent for heavy metals removal from wastewater",
abstract = "Melamine-formaldehyde-diethylenetriaminepentaacetic acid (MF-DTPA) resin was prepared as a new adsorbent for removing heavy metals from wastewater effluents. The resin was synthesised by anchoring the chelating agent diethylenetriaminepentaacetic acid (DTPA) to melamine via amide covalent bond during melamine-formaldehyde condensation reaction in an acidic aqueous medium. The effects of reaction parameters (temperature, acidity, and water content) on resin characteristics (water regain, rigidity, DTPA functionality, and porosity) were monitored to specify the best synthesis conditions. The resin was chemically characterized using infrared spectroscopy (FTIR), elemental analysis (EA), thermal programmed decomposition-mass spectrometry (TPD-MS), solid-state 13C NMR and 15N NMR, and was morphologically characterized using N2 gas adsorption/desorption (BET analysis) and field emission-scanning electron microscopy (FE-SEM). The water regain factor was also calculated to determine hydrophilic character of the resin. The simultaneous adsorption performance of MF-DTPA resin towards selected heavy metals, Co(II), Cd(II), Zn(II), and Cu(II), was discussed. Quantitative analysis for adsorption was conducted using atomic absorption to investigate the kinetics, adsorption isotherm and thermodynamics of the removal process considering pH, initial concentration, temperature, and contact time as controlling parameters. The mechanism of adsorption was suggested based on experimental results. This work shows the potential application of the MF-DTPA resin for removing heavy metals from wastewaters.",
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AU - Hall, P.J.

AU - Heslop, M.

PY - 2007/7

Y1 - 2007/7

N2 - Melamine-formaldehyde-diethylenetriaminepentaacetic acid (MF-DTPA) resin was prepared as a new adsorbent for removing heavy metals from wastewater effluents. The resin was synthesised by anchoring the chelating agent diethylenetriaminepentaacetic acid (DTPA) to melamine via amide covalent bond during melamine-formaldehyde condensation reaction in an acidic aqueous medium. The effects of reaction parameters (temperature, acidity, and water content) on resin characteristics (water regain, rigidity, DTPA functionality, and porosity) were monitored to specify the best synthesis conditions. The resin was chemically characterized using infrared spectroscopy (FTIR), elemental analysis (EA), thermal programmed decomposition-mass spectrometry (TPD-MS), solid-state 13C NMR and 15N NMR, and was morphologically characterized using N2 gas adsorption/desorption (BET analysis) and field emission-scanning electron microscopy (FE-SEM). The water regain factor was also calculated to determine hydrophilic character of the resin. The simultaneous adsorption performance of MF-DTPA resin towards selected heavy metals, Co(II), Cd(II), Zn(II), and Cu(II), was discussed. Quantitative analysis for adsorption was conducted using atomic absorption to investigate the kinetics, adsorption isotherm and thermodynamics of the removal process considering pH, initial concentration, temperature, and contact time as controlling parameters. The mechanism of adsorption was suggested based on experimental results. This work shows the potential application of the MF-DTPA resin for removing heavy metals from wastewaters.

AB - Melamine-formaldehyde-diethylenetriaminepentaacetic acid (MF-DTPA) resin was prepared as a new adsorbent for removing heavy metals from wastewater effluents. The resin was synthesised by anchoring the chelating agent diethylenetriaminepentaacetic acid (DTPA) to melamine via amide covalent bond during melamine-formaldehyde condensation reaction in an acidic aqueous medium. The effects of reaction parameters (temperature, acidity, and water content) on resin characteristics (water regain, rigidity, DTPA functionality, and porosity) were monitored to specify the best synthesis conditions. The resin was chemically characterized using infrared spectroscopy (FTIR), elemental analysis (EA), thermal programmed decomposition-mass spectrometry (TPD-MS), solid-state 13C NMR and 15N NMR, and was morphologically characterized using N2 gas adsorption/desorption (BET analysis) and field emission-scanning electron microscopy (FE-SEM). The water regain factor was also calculated to determine hydrophilic character of the resin. The simultaneous adsorption performance of MF-DTPA resin towards selected heavy metals, Co(II), Cd(II), Zn(II), and Cu(II), was discussed. Quantitative analysis for adsorption was conducted using atomic absorption to investigate the kinetics, adsorption isotherm and thermodynamics of the removal process considering pH, initial concentration, temperature, and contact time as controlling parameters. The mechanism of adsorption was suggested based on experimental results. This work shows the potential application of the MF-DTPA resin for removing heavy metals from wastewaters.

KW - melamine-formaldehyde-DTPA resin

KW - chelating adsorption

KW - heavy metal

KW - kinetics

KW - isotherm

KW - thermodynamics

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