Izolacija mikro in nanoceluloze iz rastlinskih materialov

diplomsko delo univerzitetnega študijskega programa I. stopnje

Monika Dokl (Author), Maja Leitgeb (Mentor), Katja Heržič (Co-mentor)

Abstract

Nanoceluloza s časom pridobiva vse več pozornosti, saj velja za material z dobrimi mehanskimi in termičnimi lastnostmi. Uporablja se v številnih aplikacijah, kjer se dodaja k drugim materialom in tako izboljša njihove lastnosti. Zaradi razširjenosti, nizke cene in odličnih lastnosti lahko nanocelulozo proizvajamo trajnostno in obnovljivo. V diplomskem delu smo iz praproti Polypodiopsida celulozo izolirali na tri različne načine. Vsi postopki so zajemali začetno mehansko obdelavo in kasnejšo kemijsko obdelavo. Kemijski postopki so vsebovali alkalno in kislinsko obdelavo, obdelavo z vodikovim peroksidom in obdelavo z žveplovo (VI) kislino. Spreminjali smo časovna obdobja naštetih obdelav. Vzorci so bili analizirani s Fourierjevo transformacijsko infrardečo spektroskopijo (FTIR), termogravimetrično analizo (TGA), diferenčno dinamično kalorimetrijo (DSC), dinamičnim sipanjem svetlobe (DLS), vrstičnim elektronskim mikroskopom (SEM) in energijsko disperzijsko spektrometrijo (EDS). S FTIR analizo smo potrdili prisotnost celuloze, hemiceluloze in lignina, z EDS analizo pa vsebnost ogljika in kisika. S TGA in DSC smo daljšo alkalno obdelavo označili za najuspešnejšo pri zagotavljanju termične stabilnosti. S SEM in DLS metodo smo postopek, ki je vseboval daljšo obdelavo z vodikovim peroksidom, označili za najuspešnejšega, saj smo v tem primeru dobili nanocelulozo.

Keywords

celuloza;nanoceluloza;mikroceluloza;izolacija;rastlinski material;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2018
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[M. Dokl]
UDC:	547.458.8(043.2)
COBISS:	21967894
Views:	1086
Downloads:	120
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Isolation micro and nanocellulose from plant materials
Secondary abstract:	Nanocellulose is gaining more and more attention over time as it is a material with good mechanical and thermal properties. It is used in many applications where it is added to other materials to improve their properties. Because it is commonly spread and has low price and unique properties, nanocellulose can be manufactured sustainably and is renewable. In this diploma paper, cellulose was isolated from Polypodiopsida fern in three different procedures. All procedures included initial mechanical processing and subsequent chemical treatment. Chemical processes were alkali and acid treatment, bleaching and treatment with sulfuric acid (VI). Within optimization, time periods of the listed treatment were changed. Samples were analyzed using Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Dynamic Light Scattering (DLS), Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS). The FTIR analysis confirmed the presence of cellulose, hemicellulose and lignin, and EDS analysis confirmed content of carbon and oxygen. With TGA and DSC analysis we have confirmed that longer alkali treatment is the most successful in providing thermal stability. With SEM and EDS analysis, the process, which included longer bleaching, was considered to be the most successful, because in this case nanocellulose was obtained.
Secondary keywords:	cellulose;nanocellulose;microcellulose;isolation;plant material;
URN:	URN:SI:UM:
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	VII, 31 str.
ID:	10956018