The partitioning and ionic competition of metal-chelates in the electrolytic foam separation process

Min Her Leu, Juu-En Chang

Research output: Contribution to journalArticle

Abstract

In this study, the electrolytic foam separation process was used to treat metal-chelate solutions at varying pH values and with varying surfactant chelating agent to metal (S/M) ratios. The ionic competition characteristics of the metal-chelate systems and the partitioning of chelates during the electrolytic foam separation process were also investigated by the 1H FT-NMR method. Results of the 1H FT-NMR analysis showed that, in the Ni-citrate-NDDTC(sodium diethyl dithiocarbamate) system with an S/M ratio of 4, the Ni-NDDTC chelate formation efficiencies for pH values of 4, 7, and 10 were 87%, 100%, and 93%, respectively. These results were consistent with measurements of efficiency of Ni removal following 90 minutes of flotation including that the efficiency of Ni removal in the Ni-citrate-NDDTC system was highest at pH=7 (95%), and was lower at pH=4 (38%) and pH=10 (74%). This investigation demonstrates that both the pH value and the S/M ratio are critical parameters for metal removal from the metal-results obtained with each coagulation-flocculation agent were evaluated in terms of the polyelectrolyte concentration parameter.

Original languageEnglish
Pages (from-to)1627-1646
Number of pages20
JournalJournal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Volume34
Issue number8
DOIs
Publication statusPublished - 1999 Jan 1

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Foams
Metals
Nuclear magnetic resonance
Flocculation
Chelation
Coagulation
Flotation
Polyelectrolytes
Surface active agents
Sodium

All Science Journal Classification (ASJC) codes

  • Environmental Engineering

Cite this

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abstract = "In this study, the electrolytic foam separation process was used to treat metal-chelate solutions at varying pH values and with varying surfactant chelating agent to metal (S/M) ratios. The ionic competition characteristics of the metal-chelate systems and the partitioning of chelates during the electrolytic foam separation process were also investigated by the 1H FT-NMR method. Results of the 1H FT-NMR analysis showed that, in the Ni-citrate-NDDTC(sodium diethyl dithiocarbamate) system with an S/M ratio of 4, the Ni-NDDTC chelate formation efficiencies for pH values of 4, 7, and 10 were 87{\%}, 100{\%}, and 93{\%}, respectively. These results were consistent with measurements of efficiency of Ni removal following 90 minutes of flotation including that the efficiency of Ni removal in the Ni-citrate-NDDTC system was highest at pH=7 (95{\%}), and was lower at pH=4 (38{\%}) and pH=10 (74{\%}). This investigation demonstrates that both the pH value and the S/M ratio are critical parameters for metal removal from the metal-results obtained with each coagulation-flocculation agent were evaluated in terms of the polyelectrolyte concentration parameter.",
author = "Leu, {Min Her} and Juu-En Chang",
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AB - In this study, the electrolytic foam separation process was used to treat metal-chelate solutions at varying pH values and with varying surfactant chelating agent to metal (S/M) ratios. The ionic competition characteristics of the metal-chelate systems and the partitioning of chelates during the electrolytic foam separation process were also investigated by the 1H FT-NMR method. Results of the 1H FT-NMR analysis showed that, in the Ni-citrate-NDDTC(sodium diethyl dithiocarbamate) system with an S/M ratio of 4, the Ni-NDDTC chelate formation efficiencies for pH values of 4, 7, and 10 were 87%, 100%, and 93%, respectively. These results were consistent with measurements of efficiency of Ni removal following 90 minutes of flotation including that the efficiency of Ni removal in the Ni-citrate-NDDTC system was highest at pH=7 (95%), and was lower at pH=4 (38%) and pH=10 (74%). This investigation demonstrates that both the pH value and the S/M ratio are critical parameters for metal removal from the metal-results obtained with each coagulation-flocculation agent were evaluated in terms of the polyelectrolyte concentration parameter.

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