Ekstrakcija ocetne kisline in dietil ftalata z aktivnega oglja

Sodnik, Neža (author), Kralj Cigić, Irena (mentor)

V tem diplomskem delu sem raziskovala interakcijo ocetne kisline (AcOH) in dietil ftalata (DEP) z aktivnim ogljem, in sicer postopek ekstrakcije obeh spojin z aktivnega oglja in učinkovitost njune adsorpcije. Za kvantitativno določitev ocetne kisline sem uporabljala ionsko, za kvantitativno določitev dietil ftalata pa plinsko kromatografijo. V prvem delu sem optimizirala metodo ekstrakcije posameznega analita tako, da sem poiskala ustrezno topilo ter najboljši način in čas stresanja ekstrakcijske mešanice. Za ekstrakcijo AcOH je bilo najustreznejše topilo 10 mM NaOH, za ekstrakcijo DEP pa aceton. Za ekstrakcijo obeh analitov je bil najprimernejši čas 60 min na ultrazvočni kopeli. Nato sem preverila ustreznost optimiziranih metod za ekstrakcijo analitov pri nižjih koncentracijah (deset- in stokratno redčenje). Metoda je bila ustrezna za ekstrakcijo nizkih koncentracij DEP, pri razredčenih raztopinah AcOH pa ni bila zanesljiva. V drugem delu sem z adsorpcijo na aktivno oglje iz zraka v pretočnem sistemu za kontrolirano atmosfero z dvema onesnaževaloma določala, kolikšen delež posameznega analita se iz zraka adsorbira na aktivno oglje. Ugotovila sem, da se iz zraka adsorbira večina AcOH in le majhen del DEP.

• Language: Slovenian
• Keywords: ekstrakcija, adsorpcija, aktivno oglje, ocetna kislina, dietil ftalat
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2021
• PID: 20.500.12556/RUL-129932
• COBISS.SI-ID: 81811459
• Publication date in RUL: 09.09.2021

Secondary language

• Language: English
• Title: Extraction of ethanoic acid and diethyl phtalate from activated carbon

Abstract

In this diploma thesis, I studied the interaction of acetic acid (AcOH) and diethyl phthalate (DEP) with activated carbon, namely the process of extraction of both compounds from the activated carbon and the efficiency of their adsorption on the mentioned sorbent. Ion chromatography was used for the quantitative determination of AcOH and gas chromatography for the quantitative determination of DEP. First, the extraction methods were optimised for each analyte by determining the appropriate solvent and the mode and time of shaking the extraction mixture. A 10 mM NaOH solution was found to be suitable for the extraction of AcOH, and acetone for the extraction of DEP. For both analytes, sonification for 60 minutes was suitable. The suitability of the optimised methods for the extraction of each analyte at lower concentrations (ten-fold and hundred-fold dilutions) was tested. The method proved to be suitable for the extraction of DEP at lower concentrations but proved to be unreliable for dilute AcOH solutions. In the second part of the thesis, I determined the percentage of each analyte that is adsorbed on activated carbon from air in a controlled atmosphere in a flow-through system with two pollutants. It was found that most of AcOH is adsorbed, while most of DEP remains in the air.

• Keywords: extraction, adsorption, activated carbon, acetic acid, diethyl phthalate