Student: D.N. Guo

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Student D.N. Guo
Recovery and extraction of heavy metal ions using
ionic liquid as green solvent
MAS AMI KUMANO, TOMOKI YABUTANI and JUNKO
MOTONAKA
International Journal of Modern Physics B Vol.
20, Nos. 25, 26 27 (2006) 4051-4056
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Contents
Introduction
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Experimental
2
Results and discussions
3
Conclusions
4
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Introduction

• Organic solvents are useful for separation,
  extraction and synthesis. "Green Chemistry" has
  been advocated in engineering and science field.
• In the concept of Green Chemistry, it is
  desirable to reduce consumption of conventional
  organic solvent for reduction of the
  environmental and human health risks.

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Introduction

• They are molten salts composed of organic cations
  and various anions. Ionic liquids are in liquid
  form at room temperature and offer excellent
  potentials for alternative solvent.
• They have unique features that are high ion
  conductivity, chemical stability, non-volatility
  and high thermal stability.

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Introduction

• They have already been used in organic synthesis,
  solvent extraction, chromatography and
  electrochemistry such as chargeable buttery, fuel
  cell, capacity, light emission device and wet
  solar cell.
• In this work, extraction of heavy metals in
  wastewater using ionic liquid as green solvent
  was examined. The effects of 8-HQ concentration,
  shaking time and volume ratio on the extraction
  efficiency were investigated.

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Experimental

• Apparatus
• ICP-AES, thermostat, pH meter, HPLC
• Materials
• N,N-Diethyl-N-methyl-N-(2-methoxyethyl)
• ammonium bis (trifluoromethansulfonyl) imide
• 8-hydroxyquinoline(8-HQ), nitric acid,
• phosphoric acid
• HPLC-grade methanol
• Potassium dihydrogen phosphate

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Experimental
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Experimental
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Results and discussions
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Results and discussions
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Results and discussions
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Results and discussions
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Results and discussions
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Conclusions

• It was possible to obtain high extraction
  efficiency of heavy metal ions using ionic liquid
  with 8-HQ as metal chelating agent.
• Extraction efficiency depended on the
  concentration of 8-HQ and its chelating
  stabilities to analyte.
• Under the optimal condition, 1424 µg of heavy
  metal ions were recovered in the 100 µl of ionic
  liquid.

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Thank you for your attention