University of Oulu

Rathnayake B, Valkama H, Ohenoja M, Haverinen J, Keiski RL. Evaluation of Nanofiltration Membranes for the Purification of Monosaccharides: Influence of pH, Temperature, and Sulfates on the Solute Retention and Fouling. Membranes. 2022; 12(12):1210.

Evaluation of nanofiltration membranes for the purification of monosaccharides : influence of pH, temperature, and sulfates on the solute retention and fouling

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Author: Rathnayake, Buddhika1; Valkama, Hanna1; Ohenoja, Markku1;
Organizations: 1Environmental and Chemical Engineering Research Unit, Faculty of Technology, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
2Unit of Measurement Technology, Kajaani University Consortium, University of Oulu, P.O. Box 127, FI-87400 Kajaani, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.8 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2022
Publish Date: 2022-12-14


Furfural, acetic acid, and sulfates are found in the hemicellulose (HMC) fraction of lignocellulosic biomass. Separation of furfural, acetic acid, and sulfates from monosaccharides by four nanofiltration (NF) membranes was evaluated with a model solution of glucose, xylose, furfural, acetic acid, and sulfates. Results showed that Alfa Laval NF99HF is the most promising membrane to purify monosaccharides, with the retentions of xylose (85%), glucose (95%), and with the minimum sulfate retention. pH has the highest impact on the retention of all solutes and there is no significant effect of temperature on the retentions of sulphates and acetic acid. Lower pH and temperature are favored to maximize the monosaccharide retention and to remove acetic acid while retaining more furfural with the monosaccharides. Moreover, fouling tendency is maximized at lower pH and higher temperatures. According to the statistical analysis, the retentions of glucose, xylose, furfural, sulfates, and acetic acid are 95%, 90%, 20%, 88%, and 0%, respectively at pH 3 and 25 °C. The presence of sulfates favors the separation of acetic acid and furfural from monosaccharides.

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Series: Membranes
ISSN: 2077-0375
ISSN-E: 2077-0375
ISSN-L: 2077-0375
Volume: 12
Issue: 12
Article number: 1210
DOI: 10.3390/membranes12121210
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Funding: This project has received funding from the Bio-based Industries Joint Undertaking (JU) under the European Union’s Horizon 2020 research and innovation program under grant agreement no. 887226. The JU receives support from the European Union’s Horizon 2020 research and innovation program and the Bio-based Industries Consortium.
EU Grant Number: (887226) BioSPRINT - Improve biorefinery operations through process intensification and new end products
Copyright information: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (