Yin Xiaoqin, Guan Kang, Gao Peng, Peng Cheng, Wu Jianqing
School of Materials Science and Engineering, South China University of Technology Guangzhou 510640 China
RSC Adv. 2018 Jan 12;8(6):2906-2914. doi: 10.1039/c7ra12314k.
A method called the precursor film firing method is proposed to improve the permeance of ceramic microfiltration membranes by avoiding intermediate layer and dip-coating process, and efficiently control the thickness of the separation layer. In this method a precursor film is prepared independently of the support by a film coating machine. This precursor film consists of two layers: AlO/PVA layer made of AlO powder and polyvinyl alcohol (PVA), and polyvinyl butyral (PVB) layer. The precursor film is pasted on the support and fired to obtain membranes. Because the intermediate layer and dip-coating process are avoided in this method, the fabricated membranes show high permeance. For the fabricated membrane with average pore size = 0.18 μm and separation layer thickness = 10.7 μm, the permeance is 3890 L m h bar. Also the separation layer thickness can be controlled efficiently. And the precursor film can be used on fabricate curved membranes such as cylindrical membranes.
提出了一种称为前驱体膜烧结法的方法，通过避免中间层和浸涂工艺来提高陶瓷微滤膜的渗透通量，并有效控制分离层的厚度。在该方法中，通过涂膜机独立于支撑体制备前驱体膜。该前驱体膜由两层组成：由氧化铝粉末和聚乙烯醇（PVA）制成的AlO/PVA层以及聚乙烯醇缩丁醛（PVB）层。将前驱体膜粘贴在支撑体上并烧结以获得膜。由于该方法避免了中间层和浸涂工艺，所制备的膜显示出高渗透通量。对于平均孔径 = 0.18μm且分离层厚度 = 10.7μm的制备膜，渗透通量为3890L m h bar。而且分离层厚度可以得到有效控制。并且该前驱体膜可用于制造诸如圆柱形膜等曲面膜。
