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Green Strategy to Reduced Nanographene Oxide through Microwave Assisted Transformation of Cellulose
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-5444-7276
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-7790-8987
2018 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 6, no 1, p. 1245-1255Article in journal (Refereed) Published
Abstract [en]

A green strategy for fabrication of biobased reduced nanographene oxide (r-nGO) was developed. Cellulose derived nanographene oxide (nGO) type carbon nanodots were reduced by microwave assisted hydrothermal treatment with superheated water alone or in the presence of caffeic acid (CA), a green reducing agent. The carbon nanodots, r-nGO and r-nGO-CA, obtained through the two different reaction routes without or with the added reducing agent, were characterized by multiple analytical techniques including FTIR, XPS, Raman, XRD, TGA, TEM, AFM, UV-vis, and DLS to confirm and evaluate the efficiency of the reduction reactions. A significant decrease in oxygen content accompanied by increased number of sp2 hybridized functional groups was confirmed in both cases. The synergistic effect of superheated water and reducing agent resulted in the highest C/O ratio and thermal stability, which also supported a more efficient reduction. Interesting optical properties were detected by fluorescence spectroscopy where nGO, r-nGO, and r-nGO-CA all displayed excitation dependent fluorescence behavior. r-nGO-CA and its precursor nGO were evaluated toward osteoblastic cells MG-63 and exhibited nontoxic behavior up to 200 μg mL-1, which gives promise for utilization in biomedical applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 6, no 1, p. 1245-1255
Keywords [en]
Biobased, Biomass, Carbon nanodots, Hydrothermal, Microwave, Reducing agent
National Category
Other Chemical Engineering Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-221151DOI: 10.1021/acssuschemeng.7b03566ISI: 000419536800131Scopus ID: 2-s2.0-85040200237OAI: oai:DiVA.org:kth-221151DiVA, id: diva2:1174099
Note

QC 20180115

Available from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-06-25Bibliographically approved

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Benyahia Erdal, NejlaAdolfsson, Karin H.Pettersson, TorbjörnHakkarainen, Minna

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