Preparation of cellulose membrane by utilizing novel solvents
Lopatina, Anastasiia (2018)
Diplomityö
2018
School of Engineering Science, Kemiantekniikka
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2018080733454
https://urn.fi/URN:NBN:fi-fe2018080733454
Tiivistelmä
The utilization of cellulose membranes for water treatment is considered as one of the most efficient treatment techniques for removal of conventional pollutants as well as contaminants of emerging concern. Still, the ways of making this technology more environmentally sound and efficient are needed to be researched. Utilization of pulp and paper industrial wastes after being exposed to adequate treatment seems to be prospective source of the cellulose for membrane preparation.
The membrane preparation from solutions of delignified wood biomass in the mixture of ionic liquid and DMSO was studied. Delignification of the wood biomass was done with DES treatment. The effect of different membrane preparation parameters (polymer composition, CBT, casting solution concentration, utilized solvent and non-solvent, casting thickness and use of different additives) was researched. Generally, all synthesized membranes can be classified as UF, while the most appropriate results in terms of both pure water permeability and retention of PEG 35 kDa were found for the membrane prepared from bleached DES treated biomass at 5 wt-% in the mixture of IL and DMSO casted at 300 μm and 0°C CBT and for the membrane prepared in the same conditions but from α cellulose.
The membrane preparation from solutions of delignified wood biomass in the mixture of ionic liquid and DMSO was studied. Delignification of the wood biomass was done with DES treatment. The effect of different membrane preparation parameters (polymer composition, CBT, casting solution concentration, utilized solvent and non-solvent, casting thickness and use of different additives) was researched. Generally, all synthesized membranes can be classified as UF, while the most appropriate results in terms of both pure water permeability and retention of PEG 35 kDa were found for the membrane prepared from bleached DES treated biomass at 5 wt-% in the mixture of IL and DMSO casted at 300 μm and 0°C CBT and for the membrane prepared in the same conditions but from α cellulose.