An adsorptive membrane filtration based on polyvinylidene fluoride (PVDF) with chitosan (CS) and carboxylated carbon nanotubes (CNTs-COOH) is prepared by method of phase conversion, and the PVDF-CS@CNTs-COOH membranes can effectively separate anionic and cationic dye wastewater. Compared to pure PVDF membranes, PVDF-CS@CNTs-COOH increases pure water flux from 36.39 (L·m⁻²·h⁻¹) to 85.25 (L·m⁻²·h⁻¹), an increase of nearly 230%. The membrane exhibits excellent rejection performance in the filtration of six types of dye wastewater. The modified membranes also performed well in terms of rejection of mixed anionic and cationic dyes and also have a high performance in recycling, with a flux of over 94% for both anionic and cationic dyes. In addition, the adsorption curve fitting results showed that the adsorption process was more consistent with the pseudo-second-order adsorption kinetic model and Langmuir mode.

采用相转化法制备了基于聚偏二氟乙烯（PVDF）与壳聚糖（CS）和羧化碳纳米管（CNTs-COOH）的吸附膜过滤，PVDF-CS@CNTs-COOH膜可以有效分离阴离子和阳离子染料废水。与纯 PVDF 膜相比，PVDF-CS@CNTs-COOH 将纯水通量从 36.39 (L·m ^-2 ·h ^-1 ) 增加到 85.25 (L·m ^-2 ·h ^-1)，增长近 230%。该膜在过滤六种染料废水中表现出优异的截留性能。改性膜在对混合阴离子和阳离子染料的截留方面也表现良好，并且在回收方面也具有很高的性能，阴离子和阳离子染料的通量均超过 94%。此外，吸附曲线拟合结果表明吸附过程更符合拟二级吸附动力学模型和Langmuir模型。