Herein, a mussel-inspired polydopamine (PDA) coating layer has been first explored as a separating layer for organic solvent nanofiltration (OSN). A PDA based separating layer was constructed on polyimide (PI) support via dopamine coating. The subsequent membrane was then treated with 1,6-hexanediamine for cross-linking on both the PDA layer and PI support. Fourier transform infrared (ATR-FTIR) and X-ray photoelectron (XPS) results indicated the deposition of PDA on support and the cross-linked structures of both PDA and PI. Scanning electron microscopy (SEM), atomic force microscopy (AFM), water contact angle, and surface energy measurements were further employed to characterize the morphologies and surface properties of the composite membranes. After an optimized coating time of 4 h, the resultant membrane showed an EtOH permeance of 0.91 L m–2 h–1 bar–1 and a RB rejection of 99%. More importantly, the composite membrane also exhibited good performance for dyes separation from a wide range of solvents including challenging polar aprotic and strongly swelling solvents, such as dimethylformamide and acetone. In addition to demonstrating a facile and effective OSN membrane fabrication approach, this study may stimulate the bioinspired design of a composite membrane for sustainable applications.
Ziwen Qin,Zhengxu Jiao,Lu Liu,Guoli Liu,Ruihua Zhao,Jianping Du
An insight into synergism of heterojuctions and covalent inorganic/organic interfaces are of great significance for developing the highly-efficient photocatalyst of hydrogen production. Herein, the Z-scheme BWO/PDA materials were prepared by in-situ polymerization of dopamine (PDA) around bismuth tungstate (BWO) surface by ultrasonic method. As-prepared BWO/PDA was self-assembled orderly by BWO nanosheets coated with PDA, and it consists of lamella-assembled spherical particles with cavities. The strong covalent connection between PDA and BWO provides a fast channel for charge transfer, and the inherent conjugated structure of PDA improves the photoelectric and photocatalytic hydrogen production ability. The photocatalytic performance of BWO/PDA is further enhanced due to efficient carries separation resulting from multi crystal planes synergism, and optimal composite exhibits high ratio of hydrogen evolution (284 μmol g −1 h −1 ), which is 14 times higher than that of PDA-free bismuth tungstate. This finding implies PDA-modified bismuth tungstate is a promising low-cost photocatalyst for hydrogen evolution applied in clean energy field.
危险品化学品经营许可证（带存储）