Qian Ming, Yan Xi, Chen Yan, Guo Xiao-Jing, Lang Wan-Zhong
The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, and Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China.
The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, and Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China.
J Colloid Interface Sci. 2022 Sep 15;622:11-20. doi: 10.1016/j.jcis.2022.04.049. Epub 2022 Apr 12.
Generally, electrospun membranes have high mechanical strength, high porosity and low permeation resistance. Although covalent organic frameworks (COFs) have attracted great interest as advanced membrane materials, few works disclosed that the COFs composite membranes were synthesized on electrospun substrates. In this work, the electrospun polyvinylidene fluoride (PVDF) membranes were used as substrates for the preparation of COF composite membranes with graphene oxide and oxidized carbon nanotubes (GO-OCNTs) as an intermediate layer. The COF/GO-OCNTs/PVDF composite membranes were prepared by suction filtering the GO-OCNTs intermediate layer on the electrospun substrate, and then interfacial polymerization of COF layer. After adding the intermediate layer, the water permeance and dye retention rate of the composite COF membrane are both improved. By exploring the reaction parameters in the interfacial polymerization process, the optimized membrane shows that the rejection rate of Coomassle brilliant blue G250 (BBG-250) is about 97.1%, and the water permeability achieves 96.7 L m h bar. In addition, the COF/GO-OCNTs/PVDF composite membrane exhibits excellent chemical and mechanical stability. The long-term filtration experiment of the composite membrane shows good water permeation stability. This work provides a method to prepare dense and defect-free COF films on electrospun substrates.
一般来说，电纺膜具有较高的机械强度、高孔隙率和低渗透阻力。尽管共价有机框架（COF）作为先进的膜材料引起了极大的关注，但很少有研究表明在电纺基底上合成了COF复合膜。在这项工作中，电纺聚偏氟乙烯（PVDF）膜被用作基底，以氧化石墨烯和氧化碳纳米管（GO-OCNTs）作为中间层来制备COF复合膜。通过在电纺基底上吸滤GO-OCNTs中间层，然后进行COF层的界面聚合，制备了COF/GO-OCNTs/PVDF复合膜。添加中间层后，复合COF膜的透水率和染料截留率均有所提高。通过探索界面聚合过程中的反应参数，优化后的膜对考马斯亮蓝G250（BBG-250）的截留率约为97.1%，水通量达到96.7 L m⁻² h⁻¹ bar⁻¹。此外，COF/GO-OCNTs/PVDF复合膜表现出优异的化学和机械稳定性。复合膜的长期过滤实验显示出良好的透水稳定性。这项工作提供了一种在电纺基底上制备致密且无缺陷的COF膜的方法。
