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Accelerating solar desalination in brine through ion activated hierarchically porous polyion complex hydrogels
Materials Horizons ( IF 13.3 ) Pub Date : 2020-10-16 , DOI: 10.1039/d0mh01259a
Fengbo Zhu 1, 2, 3, 4, 5 , Liqian Wang 3, 5, 6, 7, 8 , Baris Demir 9, 10, 11, 12 , Meng An 5, 13, 14, 15 , Zi Liang Wu 1, 2, 3, 4, 5 , Jun Yin 3, 16, 17, 18, 19 , Rui Xiao 3, 5, 6, 7, 8 , Qiang Zheng 1, 2, 3, 4, 5 , Jin Qian 3, 5, 6, 7, 8
Affiliation  

Solar-powered water desalination has been considered as one of the most promising solutions to alleviate clean water scarcity. In concentrated brine, the strong hydration ability of ions increases the required energy for water evaporation and thus lowers the desalination performances of most-existing solar vapor generators (SVGs). Here, a novel SVG is reported that exhibits superior desalination performance in brine than in pure water. This SVG is constructed by the complexation of oppositely charged polyelectrolytes into a hierarchically porous hydrogel (HPH), with interpenetrated polyaniline as efficient light absorbers. With controlled thermal management, the evaporation rate of this HPH-based SVG is 2.79 kg m−2 h−1 in simulated brine (3.5 wt% NaCl solutions) under one sun illumination, 67% higher than that in pure water (1.67 kg m−2 h−1) and more prominent than existing salt-resistant SVGs. Desalination tests with real seawater indicate that HPH is salt-resistant and sustainable for fast freshwater production. All-atom molecular dynamics simulations indicate that the unique interactions between the oppositely charged groups of the polyion complex and the mobile ions in brine can alter the water state, resulting in enhanced hydrability of the polymeric skeleton. This work provides a new approach for the development of next-generation SVGs with enhanced solar desalination performance.

中文翻译:

通过离子活化的分级多孔聚离子复合水凝胶加速盐水中的太阳能脱盐

太阳能淡化被认为是减轻清洁水短缺的最有希望的解决方案之一。在浓盐水中,离子的强水合能力增加了水蒸发所需的能量,因此降低了最现有的太阳能蒸汽发生器(SVG)的脱盐性能。在此,据报道,一种新颖的SVG在盐水中比在纯水中显示出优异的脱盐性能。该SVG是通过将带相反电荷的聚电解质络合到分层多孔水凝胶(HPH)中,而互穿的聚苯胺作为有效的光吸收剂而构成的。通过受控的热管理,此基于HPH的SVG的蒸发速率为2.79 kg m -2 h -1在阳光下在模拟盐水(3.5 wt%NaCl溶液)中的浓度要比纯水(1.67 kg m -2 h -1)高67%,并且比现有的耐盐SVG更为突出。用真实海水进行的脱盐测试表明,HPH具有耐盐性,并且对于快速淡水生产具有可持续性。全原子分子动力学模拟表明,聚离子络合物带相反电荷的基团与盐水中的移动离子之间的独特相互作用可以改变水的状态,从而提高聚合物骨架的水合性。这项工作为开发具有增强的太阳能淡化性能的下一代SVG提供了一种新方法。
更新日期:2020-11-09
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