A new solvent extraction system of Au by surfactant CTMAB-TBP-inert diluent-Au（CN）-2-H2O was investigated and established. The infrared spectra and the conductivities of loaded organic phases containing （Au） were ...A new solvent extraction system of Au by surfactant CTMAB-TBP-inert diluent-Au（CN）-2-H2O was investigated and established. The infrared spectra and the conductivities of loaded organic phases containing （Au） were recorded stage by stage. It was reported that in the presence of salting-out agents the pencent extraction of Au decreased, and the conversion of emulsions from W/O to O/W happened in the extraction processed. The results demonstrate that the extraction process of Au（CN）-2 is carried out by two steps. First, an associated molecule between CTMA+ and TBP, as (C16H33)（CH3）3N+·H2O·OP（OC4H9）3, is formed by dint of water molecule, then it will pull Au（CN）-2 into the organic phase based on the electro-neutrality.展开更多
The mechanism of Au (I) extraction has been characterized using 198Au radiometry, thermodynamic equilibrium, Karl-Fischer titration and FT-IR spectroscopy techniques. The results indicate that the extraction follows ...The mechanism of Au (I) extraction has been characterized using 198Au radiometry, thermodynamic equilibrium, Karl-Fischer titration and FT-IR spectroscopy techniques. The results indicate that the extraction follows ionic combination and solvent interaction mechanism. The stoichiometry of the extracted species is 1:1:4:4 for TDMBA+: Au(CN)2- : TBP : H2O. The microstructure model of the extracted complex is a supramolecular structure via hydrogen bonding, ion dipole interaction and ionic combination. The extraction process can be described as micelles in the aqueous phase transfer into the organic phase and reversed micelles or microemulsion (W/O) form in the organic phase.展开更多
基金Project(29876016) supported by the National Natural Science Foundation of China Project(9808K) supported by theYunnan Peking University Research and Development Cooperation Foundation
文摘A new solvent extraction system of Au by surfactant CTMAB-TBP-inert diluent-Au（CN）-2-H2O was investigated and established. The infrared spectra and the conductivities of loaded organic phases containing （Au） were recorded stage by stage. It was reported that in the presence of salting-out agents the pencent extraction of Au decreased, and the conversion of emulsions from W/O to O/W happened in the extraction processed. The results demonstrate that the extraction process of Au（CN）-2 is carried out by two steps. First, an associated molecule between CTMA+ and TBP, as (C16H33)（CH3）3N+·H2O·OP（OC4H9）3, is formed by dint of water molecule, then it will pull Au（CN）-2 into the organic phase based on the electro-neutrality.
基金the National Natural Science Foundation of China (No.20023005 ) for financial support.
文摘The mechanism of Au (I) extraction has been characterized using 198Au radiometry, thermodynamic equilibrium, Karl-Fischer titration and FT-IR spectroscopy techniques. The results indicate that the extraction follows ionic combination and solvent interaction mechanism. The stoichiometry of the extracted species is 1:1:4:4 for TDMBA+: Au(CN)2- : TBP : H2O. The microstructure model of the extracted complex is a supramolecular structure via hydrogen bonding, ion dipole interaction and ionic combination. The extraction process can be described as micelles in the aqueous phase transfer into the organic phase and reversed micelles or microemulsion (W/O) form in the organic phase.
