Application of an imidazoline group-containing chelating fiber for the determination of trace noble metals in superhigh-temperature alloys

Abstract

An imidazoline group-containing chelating fiber was prepared by means of the reaction of nitrile groups with ethylenediamine in an hydrazine-modified polyacrylonitrile fiber. The adsorption properties of the chelating fiber for Au(III), Pd(II), Pt(IV), Ir(IV), Os(IV), Rh(III) and Ru(IV) ions, such as binding capacity, distribution coefficient, sorptive rate and quantitative elution of Au(III), Pd(II) and Pt(IV) ions were investigated. The imidazoline group-containing chelating fiber possessed high binding capacities and good adsorption kinetic properties, exhibited high affinity for noble metals in 0.1-1.0 mol/L HCl and could be efficiently re-used. After the separation of trace Au(III), Pd(II) and Pt(IV) ions from a matrix using the chelating fiber, these ions could be determined by ICP-AES with satisfactory results, and the relative standard deviation for Au(III), Pd(II) and Pt(IV) ions was less than 6%.

Fiber-Palladium Complex as Highly Active and Recyclable Catalyst for Heck Reaction in Air

“…The amidoxime fibers can be easily obtained by the reaction of polyacrylonitrile (PAN) and NH 2 OH. The -NH 2 and -OH in amidoxime fibers have high coordinating ability with metal cations 16,17 .…”

Synthesis and characteristics of chelating fibers containing imidazoline group or thioamide group

“…Fibrous sorbents with various functional groups, which have good kinetic properties and high adsorption efficiency, are being developed and applied in the recovery of useful elements, 12 water and air purification, 13,14 and separation and preconcentration of trace elements. [15][16][17] The application of the solid-phase extraction technique with a fibrous sorbent is largely dependent on the development of new adsorptive material. According to Pearson's hard and soft acidbase concept, the promising selective sorbents toward noble metal ions are expected from the polymers containing functional groups with donor N and S atoms.…”

Synthesis and characteristics of chelating fibers containing imidazoline group or thioamide group

“…However, the use of these gel–structure granular exchangers and porous copolymers in the separation and preconcentration of trace noble metals is limited because of their slow sorption rate. Fibrous sorbents with various functional groups, which have good kinetic properties and high adsorption efficiency, are being developed and applied in the recovery of useful elements,12 water and air purification,13, 14 and separation and preconcentration of trace elements 15–17…”