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Recovery and extraction of heavy metal ions using ionic liquid as green solvent. Student: D.N. Guo. MAS AMI KUMANO, TOMOKI YABUTANI and JUNKO MOTONAKA*. International Journal of Modern Physics B Vol. 20, Nos. 25, 26 & 27 (2006) 4051-4056. Contents. Introduction. 1. Experimental. 2. - PowerPoint PPT Presentation
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Student: D.N. Guo
Recovery and extraction of heavy metal ions using ionic liquid as
green solvent
International Journal of Modern Physics B Vol. 20, Nos. 25, 26 & 27 (2006) 4051-4056
MAS AMI KUMANO, TOMOKI YABUTANI and JUNKO MOTONAKA*
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Contents
Introduction1
Experimental2
Results and discussions3
Conclusions4
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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
ApparatusICP-AES, thermostat, pH meter, HPLC
MaterialsN,N-Diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis (trifluoromethansulfonyl) imide8-hydroxyquinoline(8-HQ), nitric acid, phosphoric acidHPLC-grade methanolPotassium dihydrogen phosphate
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Experimental
Sample
polypropylene tube
centrifuged
aqueous phase (add 2mol/l HNO3)
ionic liquid phase
ICP-AES
HPLC
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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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