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Molten Salt Intercalated MXene Membrane for d-Spacing Stabilization under Electrochemical Assistance
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2023-07-26 , DOI: 10.1021/acsestengg.3c00175 Chengyu Yuan 1 , Yuxin Li 1 , Lulu Qian 1 , Jiajian Xing 1 , Xu Wang 1 , Haiguang Zhang 1 , Lei Du 1 , Gaoliang Wei 1 , Shuo Chen 1 , Xie Quan 1
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2023-07-26 , DOI: 10.1021/acsestengg.3c00175 Chengyu Yuan 1 , Yuxin Li 1 , Lulu Qian 1 , Jiajian Xing 1 , Xu Wang 1 , Haiguang Zhang 1 , Lei Du 1 , Gaoliang Wei 1 , Shuo Chen 1 , Xie Quan 1
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Conductive membranes have gained great interest for water and wastewater treatment and have demonstrated enhanced permeability and fouling resistance under electrochemical assistance. In particular, the lamellar membranes assembled by two-dimensional (2D) materials such as graphene or MXenes are attractive due to the characteristics of high permeability and precise molecular sieving. However, the swelling problem of 2D membranes has not been adequately addressed and will be even worse in the electric fields, leading to weakened sieving performance. This study presented a molten salt intercalation method via vacuum hot pressing for the fabrication of an Al3+-intercalated MXene membrane with good antiswelling ability. X-ray photoelectron spectroscopy (XPS) analysis revealed a significant increase in the Al–O group and Al content of the intercalated MXene membrane. In situ XRD tests confirmed that Al3+ intercalation contributed to the d-spacing stability at dynamic voltages. The membranes displayed exceptional separation efficacy for organic dyes and antibiotics with rejection rates exceeding 90%. This work advances our understanding of the intercalation mechanism and membrane performance optimization and represents a step forward in enhancing the scalability of the membranes for practical applications in water treatment.
中文翻译：
电化学辅助下用于稳定 d 间距的熔盐插层 MXene 膜
导电膜在水和废水处理领域引起了极大的兴趣，并在电化学辅助下表现出增强的渗透性和抗污染性。特别是，由石墨烯或MXene等二维（2D）材料组装的层状膜由于具有高渗透性和精确分子筛分的特性而备受关注。然而，二维膜的膨胀问题尚未得到充分解决，并且在电场中会更加严重，导致筛分性能减弱。本研究提出了一种通过真空热压熔盐插层法制备具有良好抗膨胀能力的Al 3+插层MXene膜。X 射线光电子能谱 (XPS) 分析表明，插层 MXene 膜的 Al-O 基团和 Al 含量显着增加。原位 XRD 测试证实 Al 3+插层有助于动态电压下d间距的稳定性。该膜对有机染料和抗生素表现出卓越的分离效果，截留率超过 90%。这项工作增进了我们对插层机制和膜性能优化的理解，并代表着在增强膜在水处理实际应用中的可扩展性方面向前迈出了一步。
更新日期：2023-07-26
中文翻译：
电化学辅助下用于稳定 d 间距的熔盐插层 MXene 膜
导电膜在水和废水处理领域引起了极大的兴趣，并在电化学辅助下表现出增强的渗透性和抗污染性。特别是，由石墨烯或MXene等二维（2D）材料组装的层状膜由于具有高渗透性和精确分子筛分的特性而备受关注。然而，二维膜的膨胀问题尚未得到充分解决，并且在电场中会更加严重，导致筛分性能减弱。本研究提出了一种通过真空热压熔盐插层法制备具有良好抗膨胀能力的Al 3+插层MXene膜。X 射线光电子能谱 (XPS) 分析表明，插层 MXene 膜的 Al-O 基团和 Al 含量显着增加。原位 XRD 测试证实 Al 3+插层有助于动态电压下d间距的稳定性。该膜对有机染料和抗生素表现出卓越的分离效果，截留率超过 90%。这项工作增进了我们对插层机制和膜性能优化的理解，并代表着在增强膜在水处理实际应用中的可扩展性方面向前迈出了一步。
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