This study utilizes the elementary grains of fish scale to construct a filtration membrane, which manifests organic solvent nanofiltration (OSN) efficacy relying on a microflow-promoted adsorption percolation mechanism. Specifically, a colloidal suspension of Barramundi fish scales (BFS) in concentrated sulfuric acid was blended with polyvinyl alcohol (PVA) in aqueous medium. The resulting suspension was thereafter coated on two pieces of cellulose filtration paper (CFP), followed by sandwiching the two coating layers together. The resulting stacked sheet was then subjected to partial pyrolysis under slight compression to complete the membrane preparation. The resulting membrane possesses a fibrous matrix in which individual cellulose fiber is wrapped by a selective layer comprising of cubic-shaped grains that aggregate together and leave nano-crevices. The tortuous pores amongst the fibers act as permeation channels where the coating layer chafes with the permeate stream. The membrane offers high retentions (> 90%) for Sudan IV and Rose Bengal in solvent solutions of ethanol and isopropanol respectively. The assessments suggest that the membrane separation proceeds via a hybrid mechanism, by which convective feed flowing through the permeation channels disperses into the nano-crevices of the selective layer, where pore diffusion facilitates adsorption due to the increase in liquid-solid contact. In addition, the fact that liquid streams chafe with the rough selective layer amidst the permeation channels increases residence time. The friction, pore diffusion, adsorption and buildup mutually sustain the solute retention rates.

本研究利用鱼鳞的基本颗粒构建过滤膜，该膜表现出依赖于微流促进吸附渗透机制的有机溶剂纳滤 (OSN) 功效。具体而言，将尖吻鲈鱼鳞 (BFS) 在浓硫酸中的胶体悬浮液与聚乙烯醇 (PVA) 在水性介质中混合。然后将所得悬浮液涂覆在两片纤维素滤纸(CFP)上，然后将两个涂层夹在一起。然后将所得堆叠片在轻微压缩下进行部分热解以完成膜制备。所得膜具有纤维基质，其中单个纤维素纤维被选择性层包裹，该层由聚集在一起并留下纳米裂缝的立方形颗粒组成。纤维之间的曲折孔充当渗透通道，其中涂层与渗透流摩擦。该膜分别为苏丹 IV 和玫瑰红在乙醇和异丙醇的溶剂溶液中提供高保留率 (> 90%)。评估表明，膜分离是通过混合机制进行的，通过这种机制，流过渗透通道的对流进料分散到选择性层的纳米裂缝中，由于液固接触的增加，孔扩散促进了吸附。此外，液体流与渗透通道中的粗糙选择层摩擦的事实增加了停留时间。摩擦、孔扩散、吸附和堆积相互维持溶质保留率。