New effective sorbents for purification of aqueous media from technogenic contaminants

Created are the sorbents based on silica gel non-covalently modified with partially hydrogenated heterocyclic compounds (PHHC), containing nitrogen as donor atoms for purification of aqueous media from technogenic contaminants. The investigations show that the modified silica gel is characterized by a sorption capacity relatively higher than that of unmodified one. The sorption degree of metal ions is studied depending on their concentrations, total mineralization and pH value of the solutions. Conditions for selective sorption of microquantities of Eu³⁺ which has been used as chemically identical to ²⁴¹Am are described. Moreover it was shown that PHHC modified silica gel was potential to use as the sorbent to concentrate the Eu³⁺ and Sr²⁺ metal ions with initial concentrations near 1 mg∙L⁻¹ for the quantitative analysis. Also the possible mechanism of metal ion sorption on the developed sorbents was proposed. Remove selecte

Merrifield resin-linked polyazole-based sorbent for heavy metal ions extraction from water

A new sorbent for heavy metal ions, that contains links with fragments of 1,2,3-triazole, 1,2,3- and 1,2,4-triazole, both triazoles and tetrazole was developed and appropriate procedures for the synthesis of these links were described. The obtained polymer is able to form stable complexes with the ions of heavy metals, such as Eu(III), Cd(II), Pb(II), Cu(II), Sr(II). The extraction rate dependence on the age of the sorbent, concentration of the cations, pH, and concentration of competing anions was studied