Grafting Activated Graphene Oxide Nanosheets onto Ultrafiltration Membranes Using Polydopamine to Enhance Antifouling Properties
Grafting Activated Graphene Oxide Nanosheets onto Ultrafiltration Membranes Using Polydopamine to Enhance Antifouling Properties
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DOI：
10.1021/acsami.0c14210
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发表时间：
2020-10-21
影响因子：
9.5
通讯作者：
Lin, Haiqing
中科院分区：
文献类型：
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作者：
Chen, Xiaoyi;Deng, Erda;Lin, Haiqing
氧化石墨烯（GO）纳米片带负电荷并表现出优异的抗氧化性能。然而，它们的亲水性使得将它们接枝到膜表面以改善长期水下操作的可渗透性具有挑战性。在本文中，我们展示了一种在约22摄氏度的水溶液中将GO共价接枝到超滤膜表面上的通用方法。膜表面首先使用多巴胺涂底漆，然后与含有胺反应性酯的活化GO（aGO）反应。aGO接枝改善了膜表面的亲水性而不降低水渗透性。当膜在恒通量错流系统中用1.0g/L海藻酸钠挑战时，与原始膜相比，aGO接枝使临界通量增加20%，并使污染速率降低63%。改性的膜表现出48小时的操作和使用NaOH溶液的间隔清洗的稳定性。
Graphene oxide (GO) nanosheets are negatively charged and exhibit excellent antifouling properties. However, their hydrophilicity makes it challenging for their grafting onto membrane surfaces to improve antifouling properties for long-term underwater operation. Herein, we demonstrate a versatile approach to covalently graft GO onto ultrafiltration membrane surfaces in aqueous solutions at approximate to 22 degrees C. The membrane surface is first primed using dopamine and then reacted with activated GO (aGO) containing amine-reactive esters. The aGO grafting improves the membrane surface hydrophilicity without decreasing water permeance. When the membranes are challenged with 1.0 g/L sodium alginate in a constant-flux crossflow system, the aGO grafting increases the critical flux by 20% and reduces the fouling rate by 63% compared with the pristine membrane. The modified membranes demonstrate stability for 48 h operation and interval cleanings using NaOH solutions.