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Controlling the Structure of MoS2 Membranes via Covalent Functionalization with Molecular Spacers
Nano Letters ( IF 9.6 ) Pub Date : 2020-10-06 , DOI: 10.1021/acs.nanolett.0c02114 Eli Hoenig 1 , Steven E. Strong 1 , Mingzhan Wang 1 , Julia M. Radhakrishnan 1 , Nestor J. Zaluzec 2 , J. L. Skinner 1 , Chong Liu 1
Nano Letters ( IF 9.6 ) Pub Date : 2020-10-06 , DOI: 10.1021/acs.nanolett.0c02114 Eli Hoenig 1 , Steven E. Strong 1 , Mingzhan Wang 1 , Julia M. Radhakrishnan 1 , Nestor J. Zaluzec 2 , J. L. Skinner 1 , Chong Liu 1
Affiliation
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Restacked two-dimensional (2D) materials represent a new class of membranes for water–ion separations. Understanding the interplay between the 2D membrane’s structure and the constituent material’s surface chemistry to its ion sieving properties is crucial for further membrane development. Here, we reveal, and tune via covalent functionalization, the structure of MoS2-based membranes. We find features on both the ∼1 nm (interlayer spacing) and ∼100 nm (mesoporous voids between layers) length scales that evolve with the hydration level. The functional groups act as permanent molecular spacers, preventing local impermeability caused by irreversible restacking and promoting the uniform rehydration of the membrane. Molecular dynamics simulations show that the choice of functional group tunes the structure of water within the MoS2 channel and consequently determines the hydrated interlayer spacing. We demonstrate that MoS2 membranes functionalized with acetic acid have consistently ∼92% rejection of Na2SO4 with a flux of ∼1.5 lm–2 hr–1 bar–1.
中文翻译：
通过与分子间隔子的共价官能化控制MoS 2膜的结构。
重新堆叠的二维（2D）材料代表了一类用于水离子分离的新型膜。了解2D膜的结构与组成材料的表面化学之间的相互作用及其离子筛分特性对于进一步开发膜至关重要。在这里，我们揭示并通过共价官能化调整了MoS 2的结构基膜。我们发现在〜1 nm（层间间距）和〜100 nm（层间微孔）长度尺度上随水合度而变化的特征。官能团充当永久性分子间隔基，可防止不可逆的堆积引起的局部不渗透性，并促进膜的均匀水化。分子动力学模拟表明，官能团的选择可调节MoS 2通道内水的结构，从而确定水合层间的间距。我们证明了用乙酸功能化的MoS 2膜具有约92％的Na 2 SO 4截留率，通量约为1.5 lm –2 hr –1 bar–1。
更新日期：2020-11-12
中文翻译：
通过与分子间隔子的共价官能化控制MoS 2膜的结构。
重新堆叠的二维（2D）材料代表了一类用于水离子分离的新型膜。了解2D膜的结构与组成材料的表面化学之间的相互作用及其离子筛分特性对于进一步开发膜至关重要。在这里，我们揭示并通过共价官能化调整了MoS 2的结构基膜。我们发现在〜1 nm（层间间距）和〜100 nm（层间微孔）长度尺度上随水合度而变化的特征。官能团充当永久性分子间隔基，可防止不可逆的堆积引起的局部不渗透性，并促进膜的均匀水化。分子动力学模拟表明，官能团的选择可调节MoS 2通道内水的结构，从而确定水合层间的间距。我们证明了用乙酸功能化的MoS 2膜具有约92％的Na 2 SO 4截留率，通量约为1.5 lm –2 hr –1 bar–1。
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