A1 Journal article (refereed), original research

Preparation of cellulose-rich membranes from wood: effect of wood pretreatment process on membrane performance


Open Access publication

Publication Details
Authors: Lopatina Anastasiia, Anugwom Ikenna, Esmaeili Mohammadamin, Puro Liisa, Virtanen Tiina, Mänttäri Mika, Kallioinen Mari
Publisher: Springer Verlag (Germany)
Publication year: 2020
Language: English
Related Journal or Series Information: Cellulose
ISSN: 0969-0239
JUFO-Level of this publication: 2
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2020091669910

Abstract

In this study cellulose-rich membranes were fabricated from untreated and treated hardwood biomass solutions in 1-ethyl-3-methylimidazolium acetate ([Emim][OAc])—dimetylsulfoxide (DMSO) system via wet phase separation. Wood treatment methods aimed to get purified cellulose fraction of wood. Treatment sequence was as followed: deep eutectic solvent pretreatment, sodium chlorite bleaching, and alkaline treatment. Resulted biomass after each treatment step was characterized by chemical composition and crystalline fraction content. Flatsheet membranes were produced from biomass samples after each treatment step. Characterization of membranes included measurements of pure water permeability and (poly)ethyleneglycol 35 kDa retention, Fourier-transform infrared and Raman spectroscopy, X-ray diffraction measurements and thermogravimetric analysis. The study revealed that it was possible to fabricate membrane from untreated wood as well as from wood biomass after each of treatment steps. The resulted membranes differed in chemical composition and filtration performance. Membrane prepared directly from untreated wood had the highest permeability, the lowest retention; and the most complex chemical composition among others. As treatment steps removed lignin and hemicelluloses from the wood biomass, the corresponding membranes became chemically more homogeneous and showed increased retention and decreased permeability values.


Last updated on 2020-02-10 at 09:32