Accelerating solar desalination in brine through ion activated hierarchically porous polyion complex hydrogels
Accelerating solar desalination in brine through ion activated hierarchically porous polyion complex hydrogels
复制标题
通过离子激活的分层多孔聚离子复合水凝胶加速盐水中的太阳能脱盐
DOI：
10.1039/d0mh01259a
复制
发表时间：
2020
影响因子：
13.3
通讯作者：
Qian Jin
中科院分区：
文献类型：
--
作者：
Zhu Fengbo;Wang Liqian;Demir Baris;An Meng;Wu Zi Liang;Yin Jun;Xiao Rui;Zheng Qiang;Qian Jin
太阳能海水淡化被认为是缓解清洁水短缺的最有希望的解决方案之一。在浓盐水中，离子的强水化能力增加了水蒸发所需的能量，从而降低了大多数现有太阳能蒸汽发生器（SVGs）的脱盐性能。本文报道了一种新型SVG在盐水中比在纯水中表现出更好的脱盐性能。这种SVG是通过将带相反电荷的聚电解质络合成分层多孔水凝胶（HPH）而构建的，相互渗透的聚苯胺作为有效的光吸收剂。通过控制热管理，该基于hph的SVG在一次太阳光照下在模拟盐水（3.5 wt% NaCl溶液）中的蒸发速率为2.79 kg m−2 h−1，比在纯水中的蒸发速率（1.67 kg m−2 h−1）高67%，比现有的耐盐SVG更突出。用真实海水进行的脱盐试验表明，HPH具有耐盐性和可持续性，可用于快速淡水生产。全原子分子动力学模拟表明，多离子配合物中带相反电荷的基团与卤水中的移动离子之间的独特相互作用可以改变水态，从而增强聚合物骨架的可水性。这项工作为开发具有增强太阳能脱盐性能的下一代svg提供了新的途径。
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.