Chelating agents for heavy metal removal
US7527733B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2004 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Feb 25, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/912
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides for Troika acids attached to a macroporous resin and Methods of preparing the same, including direct attachment of a Troika acid, and attachment of a Troika acid precursor followed by generation of the Troika acid in situ. Methods of functionalizing a resin to facilitate attachment are also described. Multiple Troika acids, comprising a pair of Troika acids joined together are described. Synthetic routes to both microporous and macroporous resins modified by introduction of a suitable Troika-type acid have been designed and validated. In a preferred embodiment, a macroporous Troika resin removes Cu2+ and Ni2+ from aqueous solution with high affinity, and is selective against Mg2+ or Ca2+. The materials of the present invention have advantages for metal removal from power plant waste water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.