Systematic and structural studies of homogeneous and polymeric extractants for the separation and recovery of metal ions: Progress report, August 1, 1985-July 31, 1986. [Polystyrene-supported sulfonic, carboxylic and phosphinic acid resins]
We have introduced a new class of bifunctional polymer-supported extractants for use in metal ion recovery processes. These resins incorporate primary (monoaryl) phosphinic acid/secondary (diaryl) phosphine oxide ligands or a combination of primary and secondary phosphinic acid ligands, depending on the method of synthesis. Additionally, we have discovered that these bifunctional polymers operate by a unique dual mechanism in that they will ion exchange with a given metal ion in acidic solutions and then reduce it to its zerovalent state if it has an appropriate reduction potential. The concept of ''dual mechanism bifunctional polymers'' has thus been established to describe phosphinic acid resins and their derivatives. Initial work with the phosphinic acid resins examined their ion exchange ability when contacted with aqueous solutions of zinc and compared their performance with polystyrene-supported sulfonic and carboxylic resins. The phosphinic resins display superior ion exchange properties than either the sulfonic or carboxylic resins. We have explained this greater selectivity for the transition metal ions on the part of the phosphinic resins on the basis of contact ion pair formation occurring during the ion exchange process.
- Research Organization:
- Tennessee Univ., Knoxville (USA). Dept. of Chemistry
- DOE Contract Number:
- AS05-83ER13113
- OSTI ID:
- 6510791
- Report Number(s):
- DOE/ER/13113-2; ON: DE87010089
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPPER
SOLVENT EXTRACTION
GOLD
MERCURY
RESINS
COMPARATIVE EVALUATIONS
SILVER
REAGENTS
ZINC
AQUEOUS SOLUTIONS
CARBOXYLIC ACIDS
ION EXCHANGE
LIGANDS
MEMBRANES
PHOSPHONIC ACIDS
POLYSTYRENE
REDOX REACTIONS
RESEARCH PROGRAMS
SULFONIC ACIDS
CHEMICAL REACTIONS
DISPERSIONS
ELEMENTS
EXTRACTION
MATERIALS
METALS
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
POLYOLEFINS
POLYVINYLS
SEPARATION PROCESSES
SOLUTIONS
SYNTHETIC MATERIALS
TRANSITION ELEMENTS
400105* - Separation Procedures