Imidazole-based Polymer Ionic Liquid:Synthesis And Application In PtCl₄^2-?AuCl₄^- Enrichment

In this paper,based on the chlorine in the complex system of trace Pt???,Au???concentration extract difficult,resulting in the loss of resources of the real problem,an efficient and environmentally friendly processing method was proposed,and the enrichment process is systematically studied.The main content is divided into the following three parts:1.The introduction explains the main properties of platinum and gold and its application in various fields.Ionic liquid?ILs?and polymer ionic liquids?PIL?are reviewed in this paper,its concept,nature,and in terms of energy and sustainable development,especially in the area of enrichment of precious metals recovery of a wide range of applications.By analyzing the advantages and disadvantages of the traditional methods of platinum and gold enrichment,this paper puts forward the basis and significance of this research work.2.A series of imidazole-based polymeric ionic liquids?[PVC-amino]Cl,[PstCH₂-amide]Cl,and[PstCH₂-Nim]Cl?were synthesized by grafting different imidazole derivatives with polyvinyl chloride?PVC?and crosslinking of chloromethylation of polystyrene resin?PstCH₂Cl?,which used as the support skeleton,the polymer ionic liquids were characterized by elemental analysis,Infrared Spectrum?IR?analysis,Scanning Electron Microscopy?SEM?,and so on.The enrichment process of three imidazole-based polymer ionic liquids on Pt???was studied by means of single variables such as ionic liquid dosage,solution pH,reaction time and temperature change.The experimental results showed that compared with[PVC-amino]Cl and[PstCH₂-amide]Cl,[PstCH₂-Nim]Cl has highest enrichment efficiency for Pt???.In the mixed metal?Zn???,Cu???,Co???,Ni???and Cd????under the condition of existence,the synthesis of polymer ionic liquids on Pt???has good selectivity,at the same time,imidazole-based polymer ionic liquid can be recycled.3.[PstCH₂-Nim]Cl was selected as solid phase extraction agent,and the enrichment process of trace AuCl₄^-was studied.The optimal enrichment recovery conditions were determined by studying the effects of the dosage of[PstCH₂-Nim]Cl,solution pH,reaction time and temperature on the enrichment efficiency of Au???.The desorption conditions and recycling conditions of imidazole-based polymer ionic liquid to Au???were investigated.The results showed that[PstCH₂-Nim]Cl has good selectivity for Au???and can be used for recycling in the presence of mixed metals?Fe???,Cu???,Co???,Ni???and Cd????.