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Preparation of graphene oxide/poly(vinyl alcohol) composite membrane and pervaporation performance for ethanol dehydration

机译：氧化石墨烯/聚乙烯醇复合膜的制备及乙醇脱水的全蒸发性能

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Although poly(vinyl alcohol) (PVA) membranes are widely used in solvent dehydration by pervaporation, the separation factor is rather limited. Considering this, novel PVA mixed matrix membranes with graphene oxide (GO) nanosheets were prepared. poly(acrylonitrile) ultrafiltration (PAN) membrane was used as support layer. The PVA/GO composite membranes were characterized by Fourier transform infrared spectroscopy, X-ray diffractometry, scanning electron microscopy, thermogravimetric analysis and water contact angle. We also explored the pervaporation performance of the membrane for ethanol dehydration. GO slightly improves the thermal stability and crystallinity of the composite membranes. In addition, the hydrophilicity of the composite membranes is weakened after GO addition, but the crosslinking degree is increased, resulting a significant increase in the separation factor and a certain decrease in the total flux. With the amount of GO addition increases, the total flux of the PVA/GO composite membrane decreases, while the separation factor increases first and then decreases, and the preferred amount of GO addition is 2.0?wt%. Especially, the separation factor of the composite membranes with 2.0 wt% GO addition could reach 3 059, which is 16 times higher than PVA membranes, with the corresponding permeability flux is 145 g m ~(?2) h ~(?1) .
机译：尽管聚乙烯醇（PVA）膜已广泛用于通过全蒸发进行溶剂脱水的过程中，但分离系数却相当有限。考虑到这一点，制备了具有氧化石墨烯（GO）纳米片的新型PVA混合基质膜。聚（丙烯腈）超滤（PAN）膜用作支撑层。通过傅里叶变换红外光谱，X射线衍射，扫描电子显微镜，热重分析和水接触角对PVA / GO复合膜进行了表征。我们还探讨了乙醇脱水膜的渗透性能。 GO稍微改善了复合膜的热稳定性和结晶度。此外，加入GO后复合膜的亲水性减弱，但交联度增加，导致分离系数显着增加，总通量有所降低。随着GO添加量的增加，PVA / GO复合膜的总通量减小，而分离系数先增大然后减小，并且GO添加的优选量为2.0wt％。特别地，添加2.0重量％GO的复合膜的分离系数可以达到3 059，这是PVA膜的16倍，相应的渗透通量为145 g m〜（？2）h〜（？1）。

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