Cellulose Asymmetric Carbon Hollow Fiber Membrane Controlled by Radiation and Heat Treatment Conditions
Vol. 59, No. 6, pp. 356-364,
Dec. 2022
10.12772/TSE.2022.59.356
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Abstract
This study investigated the effect of spinning and heat treatment conditions on
the cellulose carbon hollow fiber membrane. A cellulose-based asymmetric carbon hollow
fiber membrane has been prepared by wet spinning process and heat treatment. Cellulose
was dissolved using EmimAc/DMSO and discharged in a coagulation bath at 60oC to form
asymmetric pores. To maintain the formed asymmetric pores even after the drying process,
there was a stepped exchange process of solvent for the elimination of water in the fiber.
The formed asymmetric pores are composed of a selective layer with dense pores and a
support layer with finger-like pores. These asymmetric pores are important structures for
increasing the selectivity and permeability of the carbon hollow fiber membrane. The pore
structure according to the heat treatment temperature was analyzed. Because the pore
size and micropores are controlled by the heat treatment condition, we applied different
temperatures (550-850oC) in the heat treatment process. It was confirmed by BET that the
surface area and pore size distribution improved 18.5%. As a result, it was confirmed that
the structure and pore size of the cellulose carbon hollow fiber membrane were significantly
affected by the spinning, solvent exchange, and heat treatment process conditions.
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