Raziskave sorpcije kovin na biooglje s SEM/EDS analizo

Starašinič, Maša (author), Zupančič, Marija (mentor)

V svoji diplomski nalogi sem s SEM/EDS analizo preučevala sorpcijo kovin na tri različne vzorce biooglja. Prva dva vzorca sta rastlinskega izvora, prvi pridobljen s pirolizo lesnih sekancev (LS), drugi pa je komercialno dostopno biooglje proizvajalca Carbon Gold (CG). Tretji vzorec biooglja (ABC) je živalskega izvora, pridobljen s pirolizo kostne moke. Osnovnim vzorcem biooglja sem določila vsebnost higroskopske vlage in pepela ter vsebnost P, Ca, Mg, K, Na in Fe. Pripravila sem obruse vzorcev biooglja in s pomočjo SEM analize opazovala površino tako pripravljenih osnovnih vzorcev ter vzorcev po izpostavitvi raztopinam Pb2+, Cd2+ in CrO42- ionov. Z EDS analizo sem določila elementno sestavo posameznih komponent biooglja in ovrednotila potencialna mesta vezave posameznih kovin. Rezultati so pokazali, da največji delež P, Ca in Na vsebuje vzorec biooglja ABC, kar glede na njegov izvor ni presenetljivo. Najnižjo vsebnost P in Ca ima vzorec biooglja CG, Na pa biooglje LS. Največji delež Mg, Fe in K vsebuje vzorec LS, ki je rastlinskega izvora, in najmanj vzorec živalskega izvora ABC. SEM/EDS analiza je pokazala, da vsi trije vzorci biooglja kažejo afiniteto vezave za vse tri zvrsti kovinskih ionov, a do sorpcije pride le na mineralne komponente posameznih vzorcev biooglja, medtem ko sorpcije kovinskih ionov na organski del vzorcev biooglja ne opazimo.

• Language: Slovenian
• Keywords: biooglje, SEM/EDS, sorpcija
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2019
• PID: 20.500.12556/RUL-113033
• COBISS.SI-ID: 1538497475
• Publication date in RUL: 29.11.2019

Secondary language

• Language: English
• Title: Study of metal sorption on biochar by SEM/EDS analysis

Abstract

In my diploma thesis, the sorption of metals on three different biochar samples using SEM/EDS analysis was studied. The first two samples are of plant origin, the first (LS) obtained by pyrolysis of wood chips, and the second (CG) a commercially available biochar of Carbon Gold. The third biochar sample (ABC) is of animal origin, obtained by pyrolysis of animal bone meal. Biochar samples were determined by the content of hygroscopic moisture and ash content and the content of P, Ca, Mg, K, Na and Fe. The samples were embedded in a resin and by means of SEM analysis, observed the surface of both the prepared basic samples and the samples after exposure to solutions of Pb2+, Cd2+ and CrO42- ions. With the EDS analysis, I determined the elemental composition of individual components of biochar and evaluated the potential binding sites of individual metals. The results showed that the highest proportion of P, Ca, and Na contained the sample ABC, which is not too surprising given its origin. The lowest content of P and Ca were found in the sample CG and the lowest content of Na in the biochar LS. The highest proportion of Mg, Fe and K contains a sample of LS that is of plant origin and the least sample of animal origin ABC. SEM/EDS analysis showed that all three biochar samples have binding affinities for all three metal ion species, but sorption occurs only on the mineral particles of the biochar samples, while no sorption on organic part of biochar samples.

• Keywords: biochar, SEM/EDS, sorption