Macroporous, Highly Hygroscopic, and Leakage-Free Composites for Efficient Atmospheric Water Harvesting,ACS Applied Materials & Interfaces

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Macroporous, Highly Hygroscopic, and Leakage-Free Composites for Efficient Atmospheric Water Harvesting
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-03-25 , DOI: 10.1021/acsami.4c01888
Zhihao Huang ₁ , Tao Zhang _{1,

2,

3} , Aiming Ju ₁ , Zhiguang Xu ₄ , Yan Zhao ₁

Affiliation

Hygroscopic composites based on hygroscopic salts and hydrogels are promising for atmospheric water harvesting (AWH), but their relatively low water production and possible salt leakage hinder real applications. Here, we report highly hygroscopic and leakage-free composites from loading LiCl into emulsion-templated sodium alginate and poly(vinyl alcohol) hydrogels with macroporous structures and interpenetrating polymer networks. The resulting composites exhibited an enhanced moisture uptake (up to 3.4 g g^–1) and leakage-free behavior even at an extremely high relative humidity (RH) of 90%. Moreover, the composites showed accelerated adsorption, with high adsorption (0.803 g g^–1 water at 25 °C and 90% RH within 1 h) and desorption due to the emulsion-templated, highly interconnected macropores. The hygroscopic composites obtained 1.12 g g^–1 water per adsorption–desorption collection cycle and showed high reusability, without obvious deterioration in adsorption, desorption, and collection after 10 cycles. With the presence of carbon nanotubes, solar-driven AWH could be realized, without the requirement of additional energy. The highly hygroscopic and leakage-free composites with enhanced and accelerated adsorption and desorption are excellent candidates for efficient AWH.

中文翻译：

用于高效大气集水的大孔、高吸湿性和无泄漏复合材料

基于吸湿盐和水凝胶的吸湿复合材料有望用于大气水收集（AWH），但其相对较低的产水量和可能的盐泄漏阻碍了实际应用。在这里，我们报道了将 LiCl 负载到乳液模板海藻酸钠和具有大孔结构和互穿聚合物网络的聚（乙烯醇）水凝胶中得到的高吸湿性和无泄漏复合材料。即使在 90% 的极高相对湿度 (RH) 下，所得复合材料也表现出增强的吸湿性（高达 3.4 gg ^–1 ）和无泄漏行为。此外，由于乳液模板化、高度互连的大孔，复合材料表现出加速吸附，具有高吸附性（25℃和90％RH下1小时内0.803 gg ^–1水）和解吸。该吸湿复合材料每个吸附-解吸收集循环获得1.12 gg ^–1水，表现出较高的可重复使用性，10个循环后吸附、解吸和收集没有明显恶化。由于碳纳米管的存在，可以实现太阳能驱动的AWH，而不需要额外的能量。具有增强和加速吸附和解吸功能的高吸湿性和无泄漏复合材料是高效 AWH 的绝佳候选者。

更新日期：2024-03-25

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