Adsorpcija organskih zagađivala na adsorbens pripremljen od ljuski lješnjaka

undergraduate thesis

• Title (english): Adsorption of organic contaminants on an adsorbent prepared from hazelnut shells
• Author: Filip Strmečki
• Mentor: Davor Dolar (mentor)
• Committee member: Davor Dolar (predsjednik povjerenstva)
• Committee member: Andrej Vidak (član povjerenstva)
• Committee member: Lidija Furač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-09-11, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Adsorpcija je proces nagomilavanja čestica iz tekuće ili plinske faze na površinu krute faze. Kao separacijski proces ima veliku važnost u industriji te se svakodnevno proučava. Koristi se za pročišćavanje plinova (uklanjanje SO2, CO2, NOx, itd.), a u pročišćavanju tekućina najvažniju primjenu ima za uklanjanje organskih tvari iz vode i za pročišćavanje vode za piće i otpadnih voda. U ovom radu uspoređivana je adsorpcija mravlje i octene kiseline te
1,4 – dioksana na granuliranom aktivnom ugljenu (komercijalnom) i ugljenu pripremljenom od ljusaka lješnjaka s metodom 1 (aktivacija sa sumpornom kiselinom) i metodom 2 (aktivacija s klorovodičnom kiselinom). Određena je specifična aktivna površina aktivnih ugljena snimanjem adsorpcijsko-desorpcijskih izotermi dušika. Ispitivanje je provedeno šaržnom adsorpcijom. Usporedbom dobivenih Freundlich-ovih izotermi, procijenjen je afinitet adsorpcije pojedinih organskih zagađivala na različitim vrstama aktivnog ugljena. Analizom rezultata, može se zaključiti da granulirani aktivni ugljen ima veću specifičnu površinu i volumen pora od ugljena od ljusaka lješnjaka pripremljenog metodom 1, dok je srednji promjer pora isti kod obje vrste ugljena. Najveću količinu karboksilnih kiselina može adsorbirati granulirani aktivni ugljen, zatim ugljen od ljusaka lješnjaka dobiven metodom 1, a najmanju ugljen od ljusaka lješnjaka dobiven metodom 2. Granulirani aktivni ugljen može adsorbirati veću količinu 1,4 – dioksana nego ugljen pripremljen od ljusaka lješnjaka metodom 1.

Abstract (english)

Adsorption is the process of the accumulation of particles from the liquid or gas phase to the surface of the solid phase. As a separation process, it is of great importance in industry and is being studied on a daily basis. It is used for gas purification (removal of SO2, CO2, NOx, etc.), and its most important application in the purification of liquids is the removal of organic compounds from water and the purification of drinking water and wastewater. In this work, the adsorption of formic acid, acetic acid, and 1,4-dioxane on granular activated carbon (commercial) and on carbon prepared from hazelnut shells by Method 1 (activation with sulfuric acid) and Method 2 (activation with hydrochloric acid) was compared. The specific active surface area of the activated carbons was determined by recording the adsorption-desorption isotherms of nitrogen. The study was carried out by batch adsorption. By comparing the obtained Freundlich isotherms, the adsorption affinity of individual organic pollutants on different types of activated carbon was estimated. From the analysis of the results, it can be concluded that granular activated carbon has a larger specific surface area and pore volume than the activated carbon prepared from hazelnut shells by Method 1, while the average pore diameter is the same for both types of activated carbon. The largest amount of carboxylic acids can be adsorbed by granular activated carbon, then by carbon prepared from hazelnut shells by Method 1, and the smallest amount can be adsorbed by carbon prepared from hazelnut shells by Method 2. Granular activated carbon can adsorb a greater amount of 1,4-dioxane than the carbon prepared from hazelnut shells by Method 2.

• Keywords: adsorpcija; organske kiseline; 1 4 – dioksan; granulirani aktivni ugljen; aktivni ugljen pripremljen od ljusaka lješnjaka; specifična površina; Freundlich-ova izoterma
• Keywords (english): adsorption; organic acids; 1 4-dioxane; granulated activated carbon; activated carbon prepared from hazelnut shells; specific surface area; Freundlich’s isotherm
• Language: croatian
• URN:NBN: urn:nbn:hr:149:525025
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-09-14 09:24:26