Separation technology using membranes is an effective choice for water treatment, but fouling is a significant problem for membrane applications. Recently, transition metal dichalcogenide nanosheets have been promising for water treatment owing to their good antifouling properties compared to other nanosheets such as graphene oxide. However, using scalable exfoliation methods for membrane synthesis is still a great challenge. Among the various methods adopted to exfoliate nanosheets from the bulk, solvent exfoliation is eliciting increased interest because of its simplicity and flexibility. Herein, we first reported the preparation of solvent-exfoliated WS₂ nanosheets for achieving polyethersulfone with improved performance as a modified membrane. The effects of WS₂ nanosheets on the morphology and separation efficiency of the prepared membranes were determined in terms of pure water permeance and solute rejection. The results indicated that the water permeance increased from 200 to 360 L/m² h bar with the solute rejection rate increasing from 89 to 98% for bovine serum albumin (BSA) and 87–98% for humic acid at a pH of 10 after the blending of WS₂ nanosheets. The membrane long-term fouling resistance for BSA filtration showed the splendid antifouling property of the modified membrane. The mechanism for achieving a high rejection rate with a high flux for mixed matrix membranes was due to nanosheet-induced surface chemistry enhancement. Overall, our findings indicated the potential of the water treatment applications of WS₂/PES mixed matrix membranes through the introduction of transition metal dichalcogenide nanosheets.

中文翻译：

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溶剂剥离的2D WS ₂ /聚醚砜防污混合基质超滤膜，用于水处理

使用膜的分离技术是水处理的有效选择，但结垢是膜应用中的重大问题。近来，过渡金属二卤化二硫化碳纳米片由于与其他纳米片如氧化石墨烯相比具有良好的防污性能，因此有望用于水处理。然而，使用可扩展的剥落方法进行膜合成仍然是巨大的挑战。在用于从主体上剥离纳米片的各种方法中，溶剂剥离由于其简单性和灵活性而引起了越来越多的关注。在本文中，我们首先报道了制备溶剂剥离型WS ₂纳米片的方法，以实现具有改进性能的改性膜聚醚砜。WS ₂的效果根据纯净水的渗透性和溶质截留率，确定了制备的膜的形态和分离效率的纳米片。结果表明，水渗透率为200增加到360升/米²与溶质截留率在后pH为10从89增加至98％牛血清白蛋白（BSA）和87-98％为腐植酸水平条WS ₂纳米片的混合。用于BSA过滤的膜的长期防污性显示了改性膜的出色的防污性能。对于混合基质膜，以高通量实现高排斥率的机制是由于纳米片诱导的表面化学增强。总体而言，我们的发现表明了WS ₂在水处理方面的应用潜力/ PES混合基质膜通过引入过渡金属二卤化碳纳米片。