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 4³ 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/m²/h and minimize J_s to 0.47 g/m²/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.

这项研究旨在鉴定不对称的醋酸纤维素（CA）/三醋酸纤维素（CTA）正渗透（FO）膜，该膜具有较高的水通量（J _v）和较低的逆盐扩散通量（J _s），并用乙酸代替了1， 4-二恶烷用于CA / CTA溶解的混合溶剂。通过使用具有4 ³ Box-Behnken设计的响应面方法，确定CA / CTA FO膜的最佳制造参数。研究了CA的重量分数（在CA / CTA = 2时），纺丝速度，退火温度和退火时间对J _v和J _s的影响。使J _v达到6.4 L / m的最佳条件² / h和将J _s最小化至0.47 g / m ² / h的总和为：6％/ 3％CA / CTA，2993 rpm的纺丝速度，87.8°C的退火温度和180 s的退火时间。制成的FO膜可拒绝进料废水中99.9％以上的重金属离子，可被用作藻酸盐凝胶的有效屏障，并易于通过超声波清洗恢复通量。