STUDIES REGARDING THE USE OF PHOSPHATE GROUPS-IMPREGNATED RESINS IN VIEW OF METAL IONS REMOVAL FROM SOLUTIONS
Autor/autori: Cerc. st. dr. ing. Mihaela CIOPEC, Sef lucr. dr. ing. Cornelia MUNTEAN, Sef lucr. dr. ing. Adina NEGREA, Prof. dr. ing. Petru NEGREA, Prof. dr. ing. Corneliu DAVIDESCU, Asist. dr. ing. Lavinia LUPA
Rezumat: Prezenta ionilor metalelor grele in mediu constituie o preocupare majora datorita toxicitatii lor pentru multe forme de viata. Tratarea apelor reziduale continand ioni de metale grele necesita concentrarea metalelor intr-un volum mai mic urmata de recuperarea sau depozitarea acestora in conditii sigure. Ionii metalelor grele pot fi indepartati din apa prin adsorbtie pe suporturi solide. Una dintre cele mai importante proprietati ale materialelor impregnate este procesarea usoara a acestora ceea ce permite utilizarea lor in numeroase aplicatii. Rasinile Amberlite XAD2, Amberlite XAD4, Amberlite XAD7, Amberlite XAD8 and Amberlite IRC 718 sunt cele mai utilizate ca si suport. Metoda de impregnare (SIR- Solvent-impregnated resins) a fost postulata ca o alternativa eficienta pentru separarea si recuperarea diferitelor specii din solutii diluate. Utilizarea polimerilor organici macro-porosi cu suprafata mare si stabilitate mecanica buna ofera multe avantaje. Conceptul SIR este bine dezvoltat si ocupa un loc important in extractia cromatografica ca aplicatie analitica si poate fi aplicat la scara industriala.
Cuvinte cheie: rasini, adsorbtie, metale, grupari organofosforice.
Abstract: The presence of heavy metal ions in environment is a major concern because of their toxicity to many life forms. Wastewater treatment containing heavy metal ions requires metal concentration in a smaller volume followed by recovery or safe storage. Heavy metal ions can be removal from water by adsorption on solid support. The impregnation of polymer matrices with common chelating ligands is an easy way to design chelating collectors. Amberlite XAD2, Amberlite XAD4, Amberlite XAD7, Amberlite XAD8 and Amberlite IRC 718 have been used as a support for such preparations. Solvent-impregnated resins (SIR) have been postulated as an effective alternative for the separation and recovery of species from dilute solution. The use of macro-porous organic polymers, with a high surface area and good mechanical stability and flow characteristics, containing selective extraction reagents offers many advantages. The concept of the SIR is now well developed and has a strong place in extraction chromatography at analytical application scale and is of potential application at industrial scale.
Keywords: resins, adsorption, metals, organophosphorus groups.