Department of Chemistry, Semnan University, Semnan, 2333383-193, Iran.
Department of Chemistry, Semnan University, Semnan, 2333383-193, Iran.
Chemosphere. 2022 Dec;308(Pt 2):136323. doi: 10.1016/j.chemosphere.2022.136323. Epub 2022 Sep 6.
Polyvinyl alcohol (PVA) and sodium alginate (SA) hydrogel-coated nanofiltration (NF) membranes with high-flux and permselectivity were prepared. The coating of PVA and SA hydrogel selective layer on a porous polysulfone (PSf)/non-woven fabric ultrafiltration substrate membrane was conducted through different three procedures including pre-crosslinking, in-situ crosslinking, and immersing crosslinking and the use of glutaraldehyde as a crosslinking agent. The properties and performances of all types of the prepared membranes were evaluated through ATR-FTIR spectroscopy, AFM, SEM, zeta potential, contact angle, and cross-flow permeation tests. The immersing technique resulted in the formation of TFC membranes with higher hydrophilicity, smoother surface layer, higher negative charge, higher permeation flux, higher salt rejection and better anti-fouling performance. Also, the higher negative surface charge of the immersing coated TFC membranes due to dissociation of hydrophilic functional groups of the PVA and SA hydrogel selective layer resulted in higher As(III) rejection. SA coated NF membrane through immersing method exhibited a higher pure water permeability of 11.2 L m h bar, NaCl, MgSO, and NaSO rejection of 38.2%, 55.1%, and 70.4%, respectively with As(III) rejection of 60.6%. All types of the PVA and SA hydrogel-coated PSf membranes possessed improved fouling resistance to BSA aqueous solution, superior anti-fouling performance was obtained with SA hydrogel coating through immersing method. Such optimum membranes indicated high stability in the long-term experiments. This study showed that the coating of the SA hydrogel layer on a PSf support through immersing method could be a promising candidate for fabricating high-flux NF membranes.
制备了具有高通量和选择性的聚乙烯醇（PVA）和海藻酸钠（SA）水凝胶涂层纳滤（NF）膜。通过不同的三种程序（预交联、原位交联和浸泡交联），并使用戊二醛作为交联剂，在多孔聚砜（PSf）/无纺织物超滤基底膜上涂覆 PVA 和 SA 水凝胶选择性层。通过衰减全反射傅里叶变换红外光谱（ATR-FTIR）、原子力显微镜（AFM）、扫描电子显微镜（SEM）、Zeta 电位、接触角和错流渗透测试评估所有类型制备膜的性能和性能。浸泡技术导致形成具有更高亲水性、更光滑的表面层、更高负电荷、更高渗透通量、更高盐截留率和更好抗污染性能的 TFC 膜。此外，由于 PVA 和 SA 水凝胶选择性层的亲水性官能团的离解，浸泡涂覆的 TFC 膜具有更高的负表面电荷，导致更高的 As(III)截留率。通过浸泡法涂覆的 SA 涂层 NF 膜表现出更高的纯水渗透率 11.2 L m h bar、NaCl、MgSO 和 NaSO 的截留率分别为 38.2%、55.1%和 70.4%，同时 As(III)的截留率为 60.6%。所有类型的 PVA 和 SA 水凝胶涂覆的 PSf 膜对 BSA 水溶液都具有改善的抗污染性，通过浸泡法涂覆的 SA 水凝胶涂层具有更好的抗污染性能。这些最佳膜在长期实验中表现出高稳定性。本研究表明，通过浸泡法在 PSf 支撑体上涂覆 SA 水凝胶层是制备高通量 NF 膜的有前途的候选方法。
