Global Desalination Research Center (GDRC), School of Earth Sciences and Environmental Engineering (SESE), Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
School of Earth Sciences and Environmental Engineering (SESE), Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
ACS Appl Mater Interfaces. 2020 Aug 12;12(32):36148-36158. doi: 10.1021/acsami.0c09510. Epub 2020 Jul 30.
A loose nanofiltration (NF) membrane with excellent dye rejection and high permeation of inorganic salt is required to fractionate dye/salt mixture in dye wastewater treatment. In this study, we fabricated the loose NF membrane by using the electrospray interfacial polymerization (EIP) method. It is a novel and facile interfacial polymerization method, which controls the thickness of the poly(piperazine-amide) (PPA) layer in nanometers (1 nm/min) and changes cross-linking degree of PPA layer and pore size by varying the electrospray time; consequently, water permeance and dye/salt rejection ratio can be handled. The fabricated EIP membrane with an optimized fabrication condition (M30, electrospray time was 30 min) possessed excellent pure water permeance (20.2 LMH/bar), high dye rejection (e.g., 99.6% for congo red (CR)), and low salt rejection (e.g., 6.3% for NaCl). Moreover, the EIP membrane exhibited enhanced antifouling property than commercial NF membrane (NF90) with a high flux recovery rate (FRR) of 87.1% and low irreversible fouling () of 12.9% after fouled by bovine serum albumin (BSA) due to its great smooth surface (average roughness () is 12.2 nm), hydrophilicity property, enhanced zeta potential, and low protein adsorption. The results indicate that the EIP loose NF membrane had a high potential for dye wastewater treatment.
需要一种具有优异染料截留率和高无机盐透过率的疏松纳滤（NF）膜，以便在染料废水处理中对染料/盐混合物进行分级。在本研究中，我们通过电喷界面聚合（EIP）方法制备了疏松 NF 膜。这是一种新颖且简便的界面聚合方法，可控制聚（哌嗪酰胺）（PPA）层的厚度在纳米级（1nm/min），并通过改变电喷时间来改变 PPA 层的交联度和孔径；因此，可以处理水透过率和染料/盐的截留率。在优化的制备条件（M30，电喷时间为 30min）下制备的 EIP 膜具有出色的纯水透过率（20.2LMH/bar）、高染料截留率（例如，对刚果红（CR）的截留率为 99.6%）和低盐截留率（例如，对 NaCl 的截留率为 6.3%）。此外，与商业 NF 膜（NF90）相比，EIP 膜具有更好的抗污染性能，由于其表面非常光滑（平均粗糙度（）为 12.2nm）、亲水性、增强的zeta 电位和低蛋白质吸附，其通量恢复率（FRR）为 87.1%，不可逆污染（）为 12.9%，因此具有更高的通量恢复率（FRR）和更低的不可逆污染（）。结果表明，EIP 疏松 NF 膜在染料废水处理方面具有很高的应用潜力。
