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首页> 美国政府科技报告 >Functional Polymers for Removal of Heavy-Metal Pollutants from Water
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Functional Polymers for Removal of Heavy-Metal Pollutants from Water

机译：功能性聚合物去除水中的重金属污染物

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The project was to design polymeric ion-exchange resins specific for metal ions and particularly for systems for removing iron from water. The resins are vinyl polymers bearing hydroxamic acids and have strong affinity for iron. Polymers were prepared in which the spacing of the hydroxamic acids were varied. The stability constants of the iron complexes showed that the spacing of the hydroxamic acids was important both in complex stability and in the selectivity of the resin for iron. The polymer having the largest binding constant for iron had an 11-atom spacing between hydroxamic-acid groups. This polymer, prepared in an insoluble form, removed to less than 0.5 ppm iron from water. The polymer could be regenerated by washing with sodium hydrosulfite or EDTA. Copolymers bearing hydroxamic acid groups cross-link in the presence of iron, resulting in viscosity increases and flocculation. Polymers for binding copper and mercury were synthesized and evaluated. The functional group for copper was the tripeptide glycylglycylhistidine. For mercury, polymers containing sulfide were studied. Preliminary evaluation showed that the polymers formed complexes with copper and mercury. Various applications of these resins in environment, health, and industry are suggested.

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