Synthesis of asymmetrical cellulose acetate/cellulose triacetate forward osmosis membrane: Optimization
Journal
Journal of the Taiwan Institute of Chemical Engineers
Journal Volume
96
Pages
299-304
Date Issued
2019
Author(s)
Chen, G.-J.
Abstract
This study aims at identifying asymmetric cellulose acetate (CA)/cellulose triacetate (CTA) forward osmosis (FO) membranes that have high water flux (J v ) and low reverse salt diffusion flux (J s ) with acetic acid to replace the 1,4-dioxane for the mixed solvent for CA/CTA dissolution. The optimum fabrication parameters for the CA/CTA FO membranes are determined by using response surface methodology with a 4 3 Box-Behnken design. Effects of weight fraction of CA (at CA/CTA = 2), spinning speed, annealing temperature and annealing time on the J v and J s are investigated. The optimum conditions to maximize the J v to 6.4 L/m 2 /h and minimize J s to 0.47 g/m 2 /h together are: 6%/3% CA/CTA, 2993 rpm spinning speed, 87.8 °C annealing temperature and 180 s annealing time. The fabricated FO membranes can reject over 99.9% heavy metal ions from feed wastewater and can be used as an effective barrier for alginate gels with easy flux recovery by ultrasound cleaning.
SDGs
Type
journal article