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Favored Surface-limited Oxidation of Cellulose with Oxone® in Water
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.ORCID-id: 0000-0002-5496-9664
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.ORCID-id: 0000-0002-8105-2317
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.ORCID-id: 0000-0001-5196-411
2017 (engelsk)Inngår i: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 7, nr 64, s. 40600-40607Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A novel method for favored primary alcohol oxidation of cellulose was developed. Cellulose pulp andCladophora nanocellulose were oxidized in a one-pot procedure by Oxone® (2KHSO5$KHSO4$K2SO4)and efficient reaction conditions were identified. The effects of the reaction on the morphology,viscosity and chemical structure of the products obtained were studied. The primary alcohol groupswere oxidized to carboxyl groups and the content of carboxyl groups was determined byconductometric titration. SEM, capillary-type viscometry and XRD were applied to characterize theproducts and to investigate the influence of oxidation. For the first time, low-cost and stable Oxone®was used as a single oxidant to oxidize cellulose into carboxyl cellulose. The oxidation is an inexpensiveand convenient process to produce carboxylic groups on the surface of the cellulose fibers and to makethe cellulose fibers charged. Particularly, this method can avoid the use of halogens and potentially toxicradicals and constitute a green route to access carboxylated cellulose. Further, sodium bromide could beused as a co-oxidant to the Oxone® and increase the carboxylic acid content by 10–20%. The Oxone®oxidation is a promising method for oxidation of cellulose and might facilitate the production of CNC.

sted, utgiver, år, opplag, sider
2017. Vol. 7, nr 64, s. 40600-40607
Emneord [en]
Cellulose, Oxone, Tempo-Mediated Oxidation, 2, 3-Dialdehyde Cellulose, Periodate-Oxidation, Chemistry, Efficient, Bromide, Delignification, Nanocellulose, Transparent, Nanofibers
HSV kategori
Forskningsprogram
Teknisk fysik med inriktning mot nanoteknologi och funktionella material
Identifikatorer
URN: urn:nbn:se:uu:diva-328237DOI: 10.1039/c7ra06141bISI: 000408043100065OAI: oai:DiVA.org:uu-328237DiVA, id: diva2:1134583
Forskningsfinansiär
Knut and Alice Wallenberg FoundationTilgjengelig fra: 2017-08-21 Laget: 2017-08-21 Sist oppdatert: 2018-01-16bibliografisk kontrollert
Inngår i avhandling
1. Functionalization, Characterization and Applications of Oxidized Nanocellulose Derivatives
Åpne denne publikasjonen i ny fane eller vindu >>Functionalization, Characterization and Applications of Oxidized Nanocellulose Derivatives
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Cellulose, a sustainable raw material derived from nature, can be used for various applications following its functionalization and oxidation. Nanocellulose, inheriting the properties of cellulose, can offer new properties due to nanoscale effects, in terms of high specific surface area and porosity. The oxidation of cellulose can provide more active sites on the cellulose chains, improving its functionalization and broadening applications. Two kinds of oxidation and their corresponding applications are described in this thesis: periodate oxidation and Oxone® oxidation.

2,3-dialdehyde cellulose (DAC) beads were prepared from Cladophora nanocellulose via periodate oxidation, and were further modified with amines via reductive amination. Several diamines were selected as possible crosslinkers to produce porous DAC beads, which showed higher porosity, stability in alkaline solution and enhanced thermal stability.

After functionalization of DAC beads with L-cysteine (DAC-LC), thiol, amine and carboxyl groups were introduced into the DAC beads, endowing the DAC-LC beads with high adsorption capacity for palladium. The synthesized DAC-LC beads were character­ized with SEM, FTIR, XPS, TGA, BET and XRD and the palladium adsorption process was investigated.

Chitosan was employed as a crosslinker in functionalization of DAC beads (DAC-CS). The conditions for the synthesis of DAC-CS beads were screened and verifying the stability of the beads in alkaline solution. The DAC-CS beads produced were investigated using SEM, FTIR, XPS, TGA and BET, and the adsorption and desorption capacity of Congo red was studied, indicating DAC-CS beads have potential as sorbent.

Oxone oxidation of cellulose is a novel one-pot oxidation method in which mainly the hydroxyl groups on C6 are oxidized to produce carboxylic acid groups on the cellulose chains. To increase the efficiency of Oxone oxidation, several reaction parameters were studied. Cellulose pulp and Cladophora nanocellulose were chosen as prototypes to investigate the effects of oxidation, and the physico­chemical properties of the oxidized products were characterized. Cellulose pulp, pretreated with Oxone oxidation, was disintegrated by homogenization to prepare cellulose nanofibers (CNF). The effect of pre­treat­ment on the preparation of CNF was studied, and the results indicated that Oxone oxidation was efficient in the production of CNF.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2017. s. 68
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1548
Emneord
Nanocellulose, Periodate oxidation, Oxone oxidation, Adsorption, Palladium, Congo red dye, Cellulose nanofibers
HSV kategori
Forskningsprogram
Teknisk fysik med inriktning mot nanoteknologi och funktionella material
Identifikatorer
urn:nbn:se:uu:diva-328388 (URN)978-91-513-0048-1 (ISBN)
Disputas
2017-10-13, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:30 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2017-09-21 Laget: 2017-08-23 Sist oppdatert: 2017-10-17

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