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    Re-use of waste cotton textile as an ultrafiltration membrane

    Year: 2021

    Journal: J. Environ. Chem. Eng., Volume 9, AUG

    Authors: Lopatina, Anastasiia; Anugwom, Ikenna; Blot, Herve; Sanchez Conde, Angela; Manttari, Mika; Kallioinen, Mari

    Organizations: foundation Etela-Karjalan Saastopankki Saatio

    Keywords: Membranes; Cellulose; Cotton recycling; Textile; EmimOAc

    Textile industry produces millions of tons of waste annually, which is predominantly incinerated or landfilled. Cotton textile comprises a quarter of total textile production, and although being renewable, its production is highly chemical-and water-intensive, rising the need for effective waste cotton textile recycling. This study presents an investigation whether it is possible to utilize waste cotton textile as a cellulose source for the fabrication of cellulose membranes. The effect of casting thickness and cellulose concentration on the prepared membranes' performance was studied. Membranes cast from 2 wt% casting solutions exhibited the highest permeabilities of 1.11 and 3.09 m3/(m(2)center dot s center dot Pa) for 300 and 150 mu m casting thickness, respectively, but poor adhesion stability and low retention. Membranes cast from solutions of higher concentrations (5, 6, and 7 wt%) resulted in membranes with more stable performance. The permeability values for 300 mu m membranes were in the range of 0.27 - 0.39 m(3)/(m(2)center dot s center dot Pa) and for 150 mu m 0.51 - 0.67 m(3)/(m(2)center dot s center dot Pa). The retention values of these six membranes were relatively close to each other, showing 80 - 92% retention of polyethylene glycol (PEG) 35 kDa. Three most promising membranes (5, 6, and 7 wt% cast at 150 mu m) were additionally characterized, showing negative zeta potential within-23 --35 mV range at pH 7 and contact angles of very hydrophilic material (14 - 16 degrees). Overall, the results showed that very hydrophilic ultrafiltration membranes having attractive permeability and retention properties can be made from textile waste. 1 m2 of cotton bed linen is enough to produce approximately 20 m2 of cellulose membrane.
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