Clay/GO asymmetric bilayer membrane with temperature and concentration dual-responsivity for enhanced ion transport properties

IF 5.3 2区 地球科学 Q2 CHEMISTRY, PHYSICAL
Nengwei Li , Kang Cheng , Yiwei Dong, Mingda Hu, Zhihong Yang, Jianmei Xu, Wei Zhou, Jian Sun
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引用次数: 0

Abstract

The controllable ion transport in the membranes has attracted significant interest for water treatment, molecular sieving, energy storage and harvesting because of the molecular/ion sieving and selectivity of the nanofluidic channels. Here, we selected Li-exchanged montmorillonite (Mt) to prepare montmorillonite/graphene oxide (Mt/GO) bilayer membranes with two-dimensional (2D) nanofluidic channels and studied the ion transport across the nanofluidic membrane under the external stimuli of temperature and concentration. It is interesting that the ion transport is affected by the orientation of Mt./GO bilayer membrane between two electrolyte cells. The bilayer membrane with GO layer facing higher concentration electrolytes shows much higher ionic conductance than that with Mt. layer facing higher concentration electrolytes, also higher than Mt./GO homogenous monolayer membrane. The diffuse current, membrane potential and output power of the bilayer membrane are affected by the external temperature and electrolyte concentration, showing good thermoelectric conversion and abnormal temperature dependence. These asymmetric bilayer membranes with the integration of the cost-effective clay and high ion-selective GO show many advantages such as low cost, facile fabrication and high ion-transport performance. This work provides a new idea for designing clay based nanofluidic membrane for creating smart high-efficient membranes.
具有温度和浓度双响应的粘土/氧化石墨烯不对称双层膜增强离子传输特性
由于纳米流体通道的分子/离子筛分和选择性,纳米流体在膜中的可控离子传输在水处理、分子筛分、能量储存和收集方面引起了人们的极大兴趣。本文选择锂交换蒙脱土(Mt)制备了具有二维(2D)纳米流通道的蒙脱土/氧化石墨烯(Mt/GO)双层膜,并研究了温度和浓度等外界刺激下离子在纳米流膜上的传输。有趣的是,两个电解质细胞之间的离子传输受到mt /GO双层膜取向的影响。面对高浓度电解质的氧化石墨烯双层膜的离子电导率明显高于面对高浓度电解质的氧化石墨烯双层膜,也高于氧化石墨烯/氧化石墨烯单层膜。双层膜的扩散电流、膜电位和输出功率受外界温度和电解质浓度的影响,表现出良好的热电转换和异常的温度依赖性。这些不对称双层膜结合了高性价比的粘土和高离子选择性氧化石墨烯,具有成本低、制备方便、离子传输性能高等优点。本研究为粘土基纳米流体膜的设计提供了新的思路,为制备智能高效膜提供了新的思路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Applied Clay Science
Applied Clay Science 地学-矿物学
CiteScore
10.30
自引率
10.70%
发文量
289
审稿时长
39 days
期刊介绍: Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...
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