Yang Liu, Zhang Qianwen, Wang Qikun, Ding Wande, Zhang Kefeng
School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China.
School of Water Resources & Environment, China University of Geosciences, Beijing 100083, China.
Membranes (Basel). 2021 Nov 19;11(11):889. doi: 10.3390/membranes11110889.
Recently, palygorskite (Pal) has become a promising new membrane additive in flux enhancement and fouling reduction, which is an environmentally friendly nanoclay material under the 2:1 layer composition with 1D tubular structure. However, the aggregation of Pal due to the intermolecular forces is still an obstacle to be solved in improving membrane performance. Herein, Pal nanoparticles were chemically modified by KH550 to weaken the aggregation and improve the dispersibility, and then incorporated into the organic phase to prepare thin-film nanocomposite (TFN) membranes. The results showed that the organo-functionalization could effectively improve the membrane hydrophilicity and dispersion of Pal nanoparticles in the polyamide layer, which contributed to the enhanced water flux (from 25 to 38 L/m·h), unchanged salt rejection (98.0%) and better antifouling capacity (91% flux recovery rate), which suggested that the organo-functionalization of nanoparticles was an efficient method in further enhancing membrane performance.
最近，坡缕缟石（Pal）已成为一种在提高通量和减少污染方面颇具前景的新型膜添加剂，它是一种环境友好型的纳米粘土材料，具有2:1层状结构和一维管状结构。然而，由于分子间作用力导致的Pal团聚仍是提高膜性能过程中有待解决的一个障碍。在此，通过KH550对Pal纳米颗粒进行化学改性，以减弱团聚并提高分散性，然后将其引入有机相中制备薄膜纳米复合（TFN）膜。结果表明，有机功能化能够有效提高膜的亲水性以及Pal纳米颗粒在聚酰胺层中的分散性，这有助于提高水通量（从25升至38升/平方米·小时）、保持盐截留率不变（98.0%）以及具有更好的抗污染能力（通量恢复率为91%），这表明纳米颗粒的有机功能化是进一步提高膜性能的一种有效方法。
