In contrast to conventional approaches, which are considered to be energy- and time-intensive, expensive, and not green, herein, we report an alternative microwave-assisted ammonium persulfate (APS) method for cellulose nanocrystals (CNCs) production, under pressurized conditions in a closed reaction system. The aim was to optimize the hydrolytic-oxidative patented procedure (US 8,900,706), replacing the conventional heating with a faster process that would allow the industrial scale production of the nanomaterial and make it more appealing to a green economy. A microwave-assisted process was performed according to dierent time–temperature programs, varying the ramp (from 5 to 40 min) and the hold heating time (from 60 to 90 min), at a fixed reagent concentration and weight ratio of the raw material/APS solution. Dierences in composition, structure, and morphology of the nanocrystals, arising fromtraditional and microwave methods, were studied by several techniques (TEM, Fourier transform infrared spectroscopy (FTIR)-attenuated total reflectance (ATR), dynamic light scattering (DLS), electrophoretic light scattering (ELS), thermogravimetric analysis (TGA), X-ray diraction (XRD)), and the extraction yields were calculated. Fine tuning the microwave treatment variables, it was possible to realize a simple, cost-eective way for faster materials’ preparation, which allowed achieving high-quality CNCs, with a defined hydrodynamic diameter (150 nm) and zeta potential (0.040 V), comparable to those obtained using conventional heating, in only 90 min instead of 16 h.
Fast Production of Cellulose Nanocrystals by Hydrolytic-Oxidative Microwave-Assisted Treatment / L. Amoroso, G. Muratore, M.A. Ortenzi, S. Gazzotti, S. Limbo, L. Piergiovanni. - In: POLYMERS. - ISSN 2073-4360. - 12:1(2020 Jan 23), pp. 68.1-68.22.
|Titolo:||Fast Production of Cellulose Nanocrystals by Hydrolytic-Oxidative Microwave-Assisted Treatment|
LIMBO, SARA (Penultimo)
PIERGIOVANNI, LUCIANO (Corresponding)
|Parole Chiave:||microwave technology; cellulose nanocrystals; energy-saving; fast-production|
|Settore Scientifico Disciplinare:||Settore AGR/15 - Scienze e Tecnologie Alimentari|
|Data di pubblicazione:||23-gen-2020|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.3390/polym12010068|
|Appare nelle tipologie:||01 - Articolo su periodico|