Optimiranje uvjeta laserske pirolize u svrhu dobivanja pirolitičkih ugljika za primjenu u bioelektrokatalizi

undergraduate thesis

• Title (english): Optimization of laser pyrolysis conditions for the purpose of obtaining pyrolytic carbons for use in bioelectrocatalysis
• Author: Dario Horvat
• Mentor: Damir Iveković (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Chemistry and Biochemistry); (Laboratory for General and Inorganic Chemistry and Electroanalysis); Zagreb
• Defense date and country: 2023-09-14, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

U ovom radu provedeni su preliminarni eksperimenti koji su za cilj imali utvrditi može li se lignosulfonat, kao otpadni produkt iz proizvodnje papira, iskoristiti kao polazna sirovina za dobivanje pirolitičkog ugljika postupkom laserske pirolize. Za dobivanje lignosulfonatnog filma zadovoljavajućih karakteristika korištene su smjese saharoze i lignosulfonata, prethodno hidrotermalno tretirane pri 180 °C tijekom 4 sata. Karakterizacija dobivenih hidrotermalnih produkata provedena je UV-Vis i FTIR spektroskopijom, a morfološka svojstva dobivenih karboniziranih produkata i lignosulfonatnih filmova istražena je pretražnom elektronskom mikroskopijom (SEM). Pirolizom lignosulfonatnih filmova fokusiranim laserskim snopom CO₂ lasera (P = 12500 W/cm² ) priređeni su tanki filmovi pirolitičkog ugljika velike poroznosti i specifične površine. Pokazano je da je morfologija dobivenih filmova pirolitičkog ugljika neovisna o načinu pripreme lignosulfonatnog filma, što ukazuje na suštinski jednak proces pirolize filmova. Zbog velike specifične površine, priređeni filmovi obećavajući su materijal za imobilizaciju biokatalizatora i pripremu biokatalitičkih elektroda.

Abstract (english)

In this work, preliminary experiments were conducted with the aim to determine whether lignosulfonate, as a waste product from the paper industry, can be used as a starting material for preparation of pyrolytic carbon by laser pyrolysis. To obtain a lignosulfonate film with satisfactory characteristics, sucrose and lignosulfonate mixtures were used, previously hydrothermally treated at 180 °C for 4 hours. The characterization of the obtained hydrothermal products was carried out by UV-Vis and FTIR spectroscopy, and the morphological properties of the obtained carbonized products and lignosulfonate films were investigated by scanning electron microscopy (SEM). By pyrolizing the lignosulfonate films with the focused laser beam of a CO₂ laser (P = 12500 W/cm² ), thin films of pyrolytic carbon with high porosity and specific surface area were prepared. It was shown that the morphology of the obtained pyrolytic carbon films is independent on the method of preparation of the lignosulfonate film, which indicates that the pyrolysis process is essentially equal for all films. Due to the large specific surface area, the prepared films are a promising material for the immobilization of biocatalysts and the preparation of biocatalytic electrodes

• Keywords: lignosulfonat; saharoza; laserska piroliza; hidrotermalna karbonizacija
• Keywords (english): lignosulfonate; sucrose; laser pyrolysis; hydrothermal carbonization
• Language: croatian
• URN:NBN: urn:nbn:hr:159:528655
• Study programme: Title: Biotechnology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka biotehnologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka biotehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-04-29 08:51:13