Thin film nanocomposite (TFN) membranes have drawn intensive attention for desalination. Herein, we investigate the effect of addition of different kinds of functionalized (Amine, Carboxylic acid, Hydrogen) nanodiamonds (NDs) and their dispersion enhanced by surfactants mediation on polypiperazineamide selective layer synthesized on polyamide membrane via Piperazine (PIP) and Trimesoyl chloride (TMC) interfacial polymerization (IP). The addition of functionalized NDs not only enhanced the surface roughness, hydrophilicity, and degree of crosslinking of selective layer but also enhanced the water flux and salt rejection performance of the membranes. The optimum NH₂-ND₄₀₀/PIP/TMC membrane enhanced the water flux by 14 % and MgSO₄ rejection by 2.4 % with respect to the conventional PIP/TMC membrane. To further enhance the performance, different chain length surfactants such as Sodium Octyl Sulfate (SOS) and Sodium Dodecyl Sulfate (SDS) were added to the aqueous phase of IP system. The optimum SDS₁/NH₂-ND₄₀₀/PIP/TMC membrane showed improved flux and MgSO₄ rejection of 8.87 Lm⁻²h⁻¹b⁻¹ and 98.68 %. It was further investigated for long term stability performance, which resulted in maximum flux and salt rejection of 15 Lm⁻²h⁻¹b⁻¹ and 99.57 % respectively, leading to increase of water flux by 87.5 % and MgSO₄ rejection by 0.5 % with respect to the conventional PIP/TMC membrane. Overall, the highlight was that the SDS addition improved the membrane performance with well retained stability, indicating that the SDS has significantly improved the degree of crosslinking of selective layer via improved dispersion of PIP and NH₂-NDs in aqueous phase during IP, making it mechanically more stable, hydrophilic and effective for MgSO₄ rejection as compared to the conventional PIP/TMC membrane. The SDS₁/NH₂-ND₄₀₀/PIP/TMC membranes show great potential to be used in nanofiltration.

薄膜纳米复合材料 (TFN) 膜在海水淡化方面引起了广泛关注。在此，我们研究了添加不同种类的功能化（胺、羧酸、氢）纳米金刚石（NDs）及其通过表面活性剂介导增强的分散对通过哌嗪（PIP）和均苯三甲酰氯（TMC）在聚酰胺膜上合成的聚哌嗪酰胺选择性层的影响) 界面聚合 (IP)。功能化ND的加入不仅提高了选择性层的表面粗糙度、亲水性和交联度，而且提高了膜的水通量和脱盐性能。优化的 NH ₂ -ND ₄₀₀ /PIP/TMC 膜将水通量提高了 14%，MgSO ₄相对于传统的 PIP/TMC 膜，排斥率降低了 2.4%。为了进一步提高性能，将不同链长的表面活性剂如辛基硫酸钠 (SOS) 和十二烷基硫酸钠 (SDS) 添加到 IP 系统的水相中。最佳的 SDS ₁ /NH ₂ -ND ₄₀₀ /PIP/TMC 膜显示出8.87 Lm ^-2 h ^-1 b ^-1和 98.68 %的改进通量和 MgSO _{4截留率。}进一步研究了长期稳定性能，这导致最大通量和脱盐率分别为 15 Lm ⁻² h ⁻¹ b ⁻¹和 99.57 %，导致水通量增加 87.5 % 和 MgSO₄相对于传统 PIP/TMC 膜，排斥率为 0.5%。_{总体而言，亮点在于 SDS 的添加改善了膜性能并保持了良好的稳定性，表明 SDS 通过改善 IP 过程中 PIP 和 NH 2} -NDs 在水相中的分散显着提高了选择性层的交联度，使其成为与传统的 PIP/TMC 膜相比，机械性能更稳定、更亲水且对 MgSO _{4截留更有效。}SDS ₁ /NH ₂ -ND ₄₀₀ /PIP/TMC 膜显示出巨大的纳滤潜力。