多维g-C3N4/聚酰胺芳纶纳滤膜的构建及其染料脱盐机制研究

染料脱盐是现代印染行业转型升级、绿色发展的关键。但目前传统纳滤膜的宽孔径分布与荷负电等问题，无法满足小分子染料/盐离子精准筛分的要求。为此本项目以纳米异质结构设计为切入点，通过低维度g-C3N4（零维、一维和二维）与芳纶纳米纤维的内部孔道功能化构筑和表面电荷修饰等方法，在纳米尺度上调控膜结构和功能基团的分布，实现染料/盐离子精确筛分。拟用溶质迁移和PB方程对纳米异质结构组装，功能化修饰等成膜过程关键参数进行分析，量化孔径结构、孔径分布、表面电性，电荷密度等关键参数，建立基于“孔径筛分”和“电荷排斥”的协同传质模型。本项目的实施为纳滤膜的高效制备、功能化及应用提供新的思路，所制备的高通量染料脱盐纳滤膜有望解决印染行业的长期瓶颈。

Dye desalination is critical point to the transformation, upgrading and green development of modern printing and dyeing industry. However, nanofiltration membranes cannot provide feasible and precise sieving for the small dye molecules/salt ions due to the large pore size distribution and negative charge effect. Therefore, base on the new strategy of heterogeneous nanostructures, the membrane structure and functional group distribution will be regulated on the nanoscale through the methods of constructing the functional pores in low dimensions (0D, 1D and 2D) and modifying the membrane surface charge with g-C3N4 and ANFs. The separation models combined the solute migration and PB equation are proposed to analyze the nanoheterostructure membrane preparation process such as nano-heterogeneous assembly and functionalized modification with the parameters like pore size structure, pore size distribution, surface electricity, and charge density. As a result, a collaborative mass transfer model based on "pore size rejection" and "charge repulsion" could be established. The completion of this proposal can provide useful research basis and theory for designing functional nanofiltration membranes to precise separate the dye and salt molecules.