Novel functional polymers for recovery of silver

Abstract

In this study, the functional polymers containing heterocyclic ligands were synthesized by microwave modification of a crosslinked poly(vinylbenzyl chloride-divinylbenzene) matrix with 4-tertbutylpyridine, pyrrolidine, and 3-morpholinopropylamine. The sorbents were used to recover Ag(I) from the synthetic and real chloride solutions (4.00 mol/dm 3 of NaCl, 0.100 mol/dm 3 of HCl). The best Ag(I) sorption was achieved from synthetic and real chloride solutions in the case of pyrrolidine resin (16.2 and 16.7 mg/g, respectively). The sorption kinetic data were well fitted to the pseudo-first-order kinetic model. The degree of silver desorption was approximately 90% using a 1.0% potassium cyanide solution in a 0.50% hydrogen peroxide solution. All resins showed good selectivity for Ag(I) compared to Cu(II), Pb(II), Co(II), Ni(II), and Zn(II) in real chloride solution. On the basis of this study, it can be concluded that the obtained sorbents can be used to recover Ag from various sources such as ores, wastewater, and jewelry scraps.

Molecularly Imprinting Microfiltration Membranes Able to Absorb Diethyl Phthalate from Water

“…On the other hand, when values of 1/ n parameter approach to zero increase the heterogeneous character of the polymer. The constant n should have a value in the range of 1–10 for adsorption to be classified as favorable [ 22 , 57 , 58 ]. Unfortunately, the obtained fitting data did not allow to calculate the characteristic parameters for this isotherm model also, which confirms that this model is not suitable for the analysis of the sorption process of DEP on all studied membranes.…”

Silver(I) recovery on thiomorpholine - modified functional polymer

“…The microwave-modified immobilization efficiency of heterocyclic groups in the VBC/DVB copolymer was 50-90% (Pilśniak-Rabiega et al, 2019;Pilśniak-Rabiega and Wolska, 2020;Pilśniak-Rabiega and Wolska, 2021). Resin I had small values of water regain (1.06 g of water/g of polymer) due to the presence of sulfur atoms, which showed hydrophobic properties.…”

“…The parameters of the Dubinin-Radushkevich isotherm are given in Table 3. The maximum sorption capacity of AgCl4 3-obtained the Dubinin-Radushkevich isotherm model is 120.4, 131.6, and 85.2 [mg Ag/g resin] for resins with 4-tert-butylpyridine, pyrrolidine, and 3-morpholinopropylamine ligands, respectively (Pilśniak-Rabiega and Wolska, 2021).…”

“…For the 2-mercaptobenzimidazole derivative of chitosan, the maximum Ag(I) adsorption was obtained after 28 hours (Elwakeel et al, 2021). The equilibrium uptake of AgCl4 3-was reached after 48 hours for functional polymers containing 4-tert-butylpyridine, pyrrolidine, and 3-morpholinopropylamine ligands (Pilśniak-Rabiega and Wolska, 2021). The rate-controlling step of the adsorption of Ag(I) ions was determined using five kinetic models.…”

“…The functional polymers containing heterocyclic ligands, i.e., with 4-tert-butylpyridine, pyrrolidine, and 3-morpholinopropylamine were used for the removal of Ag(I) from synthetic and real chloride solutions (Pilśniak-Rabiega and Wolska, 2021). The best sorption capacity toward Ag(I) from the multicomponent solution showed pyrrolidine resin.…”