Chelating agent and application thereof

Abstract

The invention discloses a chelating agent and application thereof in supercritical CO2 chelating and extracting metal ions. The chelating agent has a low polyethyleneglycol bridge chain, fatty alkyl containing a direct chain at the lateral chain or branched-chain fatty alkyl and containing single silicon atom or Si-O-Si bonds, alkyl containing acetylated Beta-glucosyl, and the like, wherein neutral pluridentate coordination structures are formed at two ends of the low polyethyleneglycol bridge chain in a phosphoric esterification way. The chelating agent has strong chelating effect on the metal ions and is suitable for innocuous purifying treatment of solid substances that are polluted by the metal ions, such as electronic trashes, solid nuclear wastes, and the like and the cleaning of high-precision integrated circuits or wafers, especially suitable for supercritical CO2 chelating and extracting metal ions.

Description

technical field The invention belongs to the technical field of green chemistry, and in particular relates to a chelating agent and its application. Background technique The pollution and damage of heavy metals to the natural environment is quite serious. A large amount of waste liquid and waste residues produced in industry contain more heavy metal ions. pollute. In addition, scientists have been exploring an effective green purification treatment technology for the waste liquid and slag that produces highly radioactive metal ions in the nuclear industry. In addition to industrial waste liquid and slag pollution, another source of heavy metal pollution—a large amount of electronic waste, is causing more and more serious heavy metal environmental pollution in my country and other major electronic product consumer countries in the world. At present, e-waste containing heavy metals is either treated by simple landfill or ordinary chemical precipitation. Although it can temp...

AI Technical Summary

Problems solved by technology

The invention provides a chelating agent, which solves the problem of traditional chelating agents in CO 2 The problem of low solubility and low extraction efficiency in supercritical extraction of metal ions