• 文献标题:   Controllable construction of ultrathin graphene quantum dots/polyamide nanofilms via electrospray interfacial polymerization
  • 文献类型:   Article
  • 作  者:   SUN YM, LIU HL, QIN Y, FENG XS, CHEN JY, HUANG QL, XIAO CF
  • 作者关键词:   electrospray interfacial polymerization, ultrathin polyamide nanofilm, controllable structure, graphene quantum dot, nanofiltration
  • 出版物名称:   SEPARATION PURIFICATION TECHNOLOGY
  • ISSN:   1383-5866 EI 1873-3794
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1016/j.seppur.2023.123831 EA APR 2023
  • 出版年:   2023

▎ 摘  要

Ultrathin polyamide (PA) nanofilms with a controllable structure are of great significance in nanofiltration (NF). We report on a novel approach to preparing PA nanofilms based on electrospray and interfacial polymerization (E-IP) by incorporating graphene quantum dots (GQDs) in piperazine (PIP) solution and co-reacting with 1,3,5-benzenetricarbonyl trichloride (TMC) solution on the surface of a polyvinyl chloride (PVC) substrate membrane. The physicochemical structures of the PA nanofilms (like the crosslinking degree, zeta potential, pore size distribution, surface roughness and the thickness) were tailored by adjusting the electrospray time and GQDs concentrations. The results showed that the addition of GQDs significantly reduced the electrospray time required for the resulting membrane to achieve a Na2SO4 rejection of over 95 %, with a significantly reduced skin layer thickness in the PA nanofilms. Compared to the PA/PVC NF membrane without the addition of GQDs, the GQDs-PA/PVC NF membrane formed at an electrospray time of 15 min exhibited enhanced separation performance, with the Na2SO4 rejection increasing from 75.0 % to 98.8 % and water flux increasing from 34.5 to 41.0 L/(m(2).h). In addition, the NF membranes formed at short electrospray times (i.e., 2, 4, and 5 min) could achieve more than 98 % Congo Red (CR) rejection and exhibit a minor increase in permeation flux after the addition of GQDs. This study provided an insight into the uniform addition of nanomaterials into PA nanofilms to fine-tune the membrane structure.