Zhang Shiyang, Wang Zhi, Cai Mingwei, Lu Xiaochuang, Fan Tianju, Wang Ruibin, Liu Yidong, Min Yonggang
School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.
School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China.
Nanomaterials (Basel). 2022 Sep 6;12(18):3094. doi: 10.3390/nano12183094.
Due to its unique physical and chemical properties, MXene has recently attracted much attention as a promising candidate for wastewater treatment. However, the low water permeation flux of MXene membrane remains a challenge that has not been fully solved. In this study, attapulgite was used to increase the flux of MXene membrane through a facile one-pot method, during which the MXene nanosheets were self-assembled while being intercalated by the attapulgite nanorods to finally form the composite membranes. Under optimal conditions, an increase of water permeation flux of 97.31% could be observed, which was attributed to the broadened nano-channel upon the adequate intercalation of attapulgite nanorods. Its permeation flux and rejection rate for methylene blue (MB) were further studied for diverse applications. In contrast to bare MXene, the permeation flux increased by 61.72% with a still high rejection rate of 90.67%, owing to the size rejection. Overcoming a key technique barrier, this work successfully improved the water permeability of MXene by inserting attapulgite nanorods, heralding the exciting prospects of MXene-based lamellar membrane in dye wastewater treatment.
由于其独特的物理和化学性质，MXene最近作为一种有前途的废水处理候选材料而备受关注。然而，MXene膜的低水渗透通量仍然是一个尚未完全解决的挑战。在本研究中，通过一种简便的一锅法使用凹凸棒石来提高MXene膜的通量，在此过程中，MXene纳米片在被凹凸棒石纳米棒插层的同时进行自组装，最终形成复合膜。在最佳条件下，可以观察到水渗透通量增加了97.31%，这归因于凹凸棒石纳米棒充分插层后纳米通道变宽。进一步研究了其对亚甲基蓝（MB）的渗透通量和截留率，以用于不同的应用。与裸MXene相比，由于尺寸截留作用，渗透通量增加了61.72%，截留率仍高达90.67%。克服了一个关键技术障碍，这项工作通过插入凹凸棒石纳米棒成功提高了MXene的水渗透性，预示着基于MXene的层状膜在染料废水处理中令人兴奋的前景。
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