With the continuous development of environmental protection and resource recycling demands, the development of bio-based separation membrane materials has increasingly attracted attention. Bio-based polyamide 56 (PA56), exhibiting excellent hydrophilicity, spinnability, and mechanical properties, is expected to complement and replace traditional separation membrane materials. In this study, the electrospinning preparation and structural control of PA56 nanofiber membranes were achieved through the optimization of PA56 content and mixed solvent ratios. The study found that when the PA56 content was 16 wt% and the formic acid to acetone ratio in the mixed solvent was 8:2, the nanofiber diameter distribution was the most uniform. Building on this, amino-functionalized modified silica (SiO 2 –NH 2 ) nanoparticles were introduced to prepare PA56/SiO 2 –NH 2 composite nanofiber membranes featuring a cobweb-like nanofiber network and micro-nodule structure. The effects of the addition of SiO 2 –NH 2 nanoparticles on the morphology, structure, and properties of the fiber membranes were studied. The results indicate that the control of the mixed solvent ratio and the addition of SiO 2 –NH 2 nanoparticles led to the formation of a cobweb-like nanofiber network and micro-nano nodular structure on the nanofiber surface, enhancing the hydrophilicity of PA56 nanofiber membranes. The M − 3 membrane with a nanoparticle addition amount of 0.8 wt% exhibited high hydrophilicity and underwater superoleophobic properties, achieving efficient separation of stable oil-in-water emulsions with a separation efficiency of 99.8 %. This work provides a new bio-based membrane material and its preparation method for treating oily wastewater using the membrane separation method.
Yuxin Wei,Menglong Dai,Yige Liu,Rui Hao,Shuchang Wang,Huiqun Zeng,Xinghua Hong
Biobased multifunctional composites with graphene-like fillers can be widely used in various industries, such as aerospace, automotive, and energy industries. Such organic‒inorganic composites containing biomaterials currently suffer from prolonged fabrication processes and limited functionality. Herein, a biobased composite that incorporates in situ reduced graphene oxide (RGO) onto a carbon fiber mat (CFM) is presented, which is rapidly combined with biobased polyamide (PA56) under high-temperature and low-pressure conditions to maintain the structural integrity of the three-dimensional network within the matrix, thereby enhancing its electrical and mechanical properties. As a result of these strategies, the biobased RGO/CFM/PA56 composite demonstrates significantly enhanced electrical heating performance (5 V, 126 °C) and electromagnetic shielding capability (76 dB, 0.74 mm), which is among the highest values reported for existing biobased composite materials. Furthermore, the material exhibited notable thermoelectric properties, characterized by a value of −25.3 μV K −1 . Notably, the modified composite demonstrates rapid thermal forming capabilities and possesses welding characteristics facilitated by PA56, enabling it to be recyclable and reusable. After rapid repair, the mechanical performance of the samples remains at approximately 80 %, whereas the other functionalities are maintained above 90 %. This study is the first to report biobased PA56/carbon fiber mat composites, highlighting their benefits in various applications and providing a fresh perspective on sustainable and high-performance biobased composites.
危险品化学品经营许可证（带存储）