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首页> 外文期刊>Polymers for advanced technologies >Two‐stage phase separation of cellulose acetate membranes modified with plasma‐treated natural zeolite: Response surface modeling
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Two‐stage phase separation of cellulose acetate membranes modified with plasma‐treated natural zeolite: Response surface modeling

机译：用等离子体处理的天然沸石改性纤维素醋酸纤维素膜的两阶段分离：响应表面建模

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> Cellulose acetate (CA) microfiltration membranes were prepared by two‐stage vapor‐induced phase separation (VIPS) and immersion precipitation. To improve the hydrophilicity and permeability of the membranes at low operating pressures, plasma‐treated natural zeolite was incorporated into the membranes. A response surface methodology based on the three‐level central composite design (CCD) was used to model and optimize the casting solution composition of the membranes with the aim of maximizing membranes permeability. Three independent variables for CCD optimization were concentration of CA, polyvinylpyrrolidone (PVP) pore former, and plasma‐treated zeolite additive. The results showed that a second‐order polynomial model could properly predict the response (pure water flux) at any input variable values with a satisfying determination coefficient ( R 2 ) of 0.954. Also, analysis of variance (ANOVA) confirmed the adequacy of the obtained model. The permeability of the prepared membranes increased by increasing zeolite loading from 0.10 to 0.50?wt%, which was related to the membranes morphology and porosity and confirmed by scanning electron microscopy (SEM) images. Pure water flux of the membranes decreased by increasing CA concentration while an optimum PVP amount was required to reach the maximum flux. The result of the bubble point analysis well matched with surface SEM images of the membranes and permeability trend predicted by CCD model. Also, the prepared CA membranes with different compositions showed no toxicity for mouse L929 fibroblast , which indicated their nontoxic and biocompatible nature.
机译： > 醋酸纤维素（CA）微滤膜通过两阶段蒸气诱导的相分离（vIP）和浸渍沉淀制备。为了改善膜在低操作压力下的亲水性和渗透性，血浆处理的天然沸石掺入膜中。基于三级中央复合设计（CCD）的响应面方法用于模拟和优化膜的浇铸溶液组合物，其目的是最大化膜渗透性。 CCD优化的三个独立变量是Ca，聚乙烯吡咯烷酮（PVP）孔前的浓度和等离子体处理的沸石添加剂。结果表明，二阶多项式模型可以在任何输入变量值下正确预测响应（纯净水量），以满足的确定系数（ R 2 0.954。此外，方差分析（ANOVA）证实了所获得的模型的充分性。通过将0.10至0.50℃的沸石负荷增加，制备膜的渗透率增加，其与膜形态和孔隙率有关并通过扫描电子显微镜（SEM）图像来证实。通过增加Ca浓度，膜的纯净水通量通过增加最佳PVP量来达到最大通量。泡点分析的结果与CCD模型预测的膜表面SEM图像匹配良好匹配。此外，具有不同组成的制备的Ca膜显示出小鼠的毒性 L929成纤维细胞 ，这表明了他们无毒和生物相容性的性质。

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