In this study, polydopamine (PDA) particles were embedded into polyethersulfone (PES) membrane through wet-phase separation. We considered two concentration of PES solution—17 and 19 wt%. Adding different concentration of PDA (0–0.7 wt%) into the two solutions revealed an opposite effect on the characteristic and performance of the membrane. Incorporating PDA particles in 17 wt% PES solution was resulted in a decreased in pure water flux, and increased in dye rejection; Whereas, incorporating PDA particles in 19 wt% PES solution boosted the pure water flux with keep dye rejection of ~99.0%. At the optimum concentration of 0.5 wt% PDA added to 19 wt% PES solution, the following dye rejections were obtained: R_{Methylene Blue} = 99.90 ± 1.45%; R_{Procion Blue H-5R} = 98.33 ± 0.57%; R_{Direct Red 23} = 99.90 ± 1.82%; R_{Brilliant Blue} = 99.90 ± 0.94%; R_{Rose Bengal} = 99.90 ± 0.0%; R_{Direct Red 80} = 99.12 ± 0.41%; for the salt rejections: (R_NaCl = 10.59 ± 5.23%; R_Na2SO4 = 8.87 ± 4.99%; R_MgCl2 = 10.45 ± 6.85%; R_MgSO4 = 10.02 ± 3.87%). This shows that the selectivity of the fabricated membrane towards different dyes and common inorganic salts is high. PDA is a favorable option for fabricating membranes for dye desalination under appropriate PES concentration.

在这项研究中，聚多巴胺（PDA）颗粒通过湿相分离嵌入到聚醚砜（PES）膜中。我们考虑了两种浓度的PES溶液-17和19 wt％。在两种溶液中添加不同浓度的PDA（0–0.7 wt％），对膜的特性和性能产生相反的影响。将PDA颗粒掺入17 wt％的PES溶液中会导致纯水通量下降，并增加染料截留率。而在19 wt％的PES溶液中掺入PDA颗粒可提高纯净水通量，并保持约99.0％的染料截留率。在添加到19 wt％PES溶液中的0.5 wt％PDA的最佳浓度下，获得了以下染料排斥反应：R_亚甲基蓝 = 99.90±1.45％；R _{Procion蓝H-5R}  = 98.33±0.57％; [R_直接红23  = 99.90±1.82％; R_亮蓝色 = 99.90±0.94％; R_玫瑰红 = 99.90±0.0％; R_直接红80  = 99.12±0.41％; 对于除盐率：（R _NaCl  = 10.59±5.23％; R _Na2SO4  = 8.87±4.99％; R _MgCl2  = 10.45±6.85％; R _MgSO4  = 10.02±3.87％）。这表明制造的膜对不同的染料和常见的无机盐的选择性高。PDA是在适当的PES浓度下制造用于染料脱盐的膜的理想选择。