Membrane and Water Treatment

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Removal study of As (V), Pb (II), and Cd (II) metal ions from aqueous solution by emulsion liquid membrane

  • Dohare, Rajeev K. (Department of Chemical Engineering Malaviya NationlaI Institute of Technology) ;
  • Agarwal, Vishal (Department of Chemical Engineering Malaviya NationlaI Institute of Technology) ;
  • Choudhary, Naresh K. (Department of Chemical Engineering Malaviya NationlaI Institute of Technology) ;
  • Imdad, Sameer (Department of Chemical Engineering Malaviya NationlaI Institute of Technology) ;
  • Singh, Kailash (Department of Chemical Engineering Malaviya NationlaI Institute of Technology) ;
  • Agarwal, Madhu (Department of Chemical Engineering Malaviya NationlaI Institute of Technology)
  • Received : 2020.08.01
  • Accepted : 2022.07.15
  • Published : 2022.07.25
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Abstract

Emulsion Liquid Membrane (ELM) is a prominent technique for the separation of heavy metal ions from wastewater due to the fast extraction and is a single-stage operation of stripping-extraction. The selection of the components (Surfactant and Carrier) of ELM is a very significant step for its preparation. In the ELM technique, the primary water- in-oil (W/O) emulsion is emulsified in water to produce water-in-oil-in-water (W/O/W) emulsion. The water in oil emulsion was prepared by mixing the membrane phase and internal phase. To prepare the membrane phase, the extractant D2EHPA (di-2-ethylhexylphosphoric acid) was used as a mobile carrier, Span-80 as a surfactant, and Paraffin as a diluent. Moreover, the internal (receiving) phase was prepared by dissolving sulphuric acid in water. Di-(2- ethylhexyl) phosphoric acid such as surfactant concentration, carrier concentration, sulphuric acid concentration in the receiving (internal) phase, agitation time (emulsion phase and feed phase), the volume ratio of the membrane phase to the receiving phase, the volume ratio of the external feed phase to the primary water-in-oil emulsion and pH of feed were studied on the percentage extraction of metal ions at 20℃. The results show that it is possible to remove 78% for As(V), 98% for Cd(II), and 99% for Pb(II). Emulsion Liquid Membrane (ELM) is a well-known technique for separating heavy metal ions from wastewater due to the fast extraction and is a single-stage operation of stripping-extraction. The selection of ELM components (Surfactant and Carrier) is a very significant step in its preparation. In the ELM technique, the primary water-in-oil (W/O) emulsion is emulsified to produce water-in-oil-in-water (W/O/W) emulsion. The water in the oil emulsion was prepared by mixing the membrane and internal phases. The extractant D2EHPA (di-2-ethylhexylphosphoric acid) was used as a mobile carrier, Span-80 as a surfactant, and Paraffin as a diluent. Moreover, the internal (receiving) phase was prepared by dissolving sulphuric acid in water. Di-(2-ethylhexyl) phosphoric acid such as surfactant concentration, carrier concentration, sulphuric acid concentration in the receiving (internal) phase, agitation time (emulsion phase and feed phase), the volume ratio of the membrane phase to the receiving phase, the volume ratio of the external feed phase to the primary water-in-oil emulsion and pH of feed were studied on the percentage extraction of metal ions at 20℃. The results show that it is possible to remove 78% for As(V), 98% for Cd(II), and 99% for Pb(II).

Keywords

Acknowledgement

The research described in this paper was financially supported by the Department of Chemical Engineering, Malaviya national institute of Technology Jaipur.

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