Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling 712100, China.
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China.
Int J Mol Sci. 2023 Apr 3;24(7):6677. doi: 10.3390/ijms24076677.
We propose a CNT-based concentric twin tube (CTT) as nanochannels for both water purification and ion separation at the nanoscale. In the model, a source reservoir dealing with the solution connects three containers via the CTT that has three subchannels for mass transfer. Before entering the three subchannels, the solution in the separating zone will form three layers (the aqua cations, water, and the aqua anions, respectively) by applying a charged capacitor with the two electrodes parallel to the flow direction of the solution. Under an electric field with moderate intensity, the three subchannels in the CTT have stable configurations for mass transfer. Since the water and the two types of aqua ions are collected by three different containers, the present model can realize both ion separation and water purification. The mass transfer in the subchannels will be sped up by an external pressure exerted on the solution in the source reservoir. The physical properties of the model, e.g., water purification speed, are analyzed with respect to the effects of the electric field, the size of CTT, and the concentration of solute, such as NaCl.
我们提出了一种基于碳纳米管的同心双管（CTT）作为纳米通道，用于在纳米尺度上进行水净化和离子分离。在该模型中，一个处理溶液的源储液器通过 CTT 与三个容器相连，CTT 有三个用于传质的子通道。在进入三个子通道之前，分离区的溶液将通过两个电极与溶液流向平行的带电荷的电容器形成三层（分别为水合阳离子、水和水合阴离子）。在中等强度的电场下，CTT 中的三个子通道具有稳定的传质构型。由于水和两种类型的水合离子分别被三个不同的容器收集，因此该模型可以实现离子分离和水净化。通过在源储液器中的溶液上施加外部压力，可以加快子通道中的传质。通过改变电场强度、CTT 的大小以及溶质（如 NaCl）的浓度等因素来分析模型的物理性质，如水净化速度。
