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首页> 美国政府科技报告 >Systematic and Structural Studies of Homogeneous and Polymeric Extractants for the Separation and Recovery of Metal Ion: Triennial Performance Report, August 1, 1983-July 31, 1986
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Systematic and Structural Studies of Homogeneous and Polymeric Extractants for the Separation and Recovery of Metal Ion: Triennial Performance Report, August 1, 1983-July 31, 1986

机译：用于分离和回收金属离子的均相和聚合物萃取剂的系统和结构研究：三年期性能报告，1983年8月1日 - 1986年7月31日

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Novel polymeric extractants have been synthesized and applied to the recovery of metal ions from dilute aqueous solutions. The new category of dual mechanism bifunctional polymers is introduced as a series of resins which permit highly selective extractions through the use of a reaction additional to ion exchange in the recovery process. The bifunctional phosphinic acid ion exchange/redox resins form the first class of resins within this category. Their synthesis and the recovery of metallic mercury, silver, gold, and copper from their ionic solutions is detailed. Under equilibrium conditions, these resins operate entirely by the redox mechanism until all of the primary phosphinic acid sites are oxidized, followed then by purely ion exchange. Kinetic studies show that the cation's reduction potential determines whether a redox reaction will occur while, at a given reduction potential, the oxidation state determines how rapidly. The significant coordinative ability of the phosphoryl oxygen is also important, though, and is responsible for extracting greater amounts of actinide ions than the sulfonic resins. For those processes where membranes would most appropriately be applied, the modification of polypropylene with interpenetrating polymer network extractants yields a recovery system with almost infinite lifetime. Such networks have been formed from polymers of di(undecenyl) phosphoric acid and found to display significantly enhanced retention within polystyrene bead supports. 10 refs. (ERA citation 12:035292)

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