Moisture-indicating cellulose aerogels for multiple atmospheric water harvesting cycles driven by solar energy,Journal of Materials Chemistry A

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Moisture-indicating cellulose aerogels for multiple atmospheric water harvesting cycles driven by solar energy
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-10-05 , DOI: 10.1039/d1ta07498a
Jiaming Sun _{1,

2} , Bang An _{1,

2} , Kun Zhang _{1,

2} , Mingcong Xu _{1,

2} , Zhenwei Wu _{1,

2} , Chunhui Ma _{1,

2} , Wei Li _{1,

2} , Shouxin Liu _{1,

2}

Affiliation

Despite the boom in atmospheric water harvesting (AWH) techniques used to deal with the challenge of clean water shortage, few studies focus on hygroscopic materials that can indicate a moisture change in real time. Here, a moisture-indicating hygroscopic aerogel working in a broad range of relative humidities (RHs) and with fast sorption kinetics is designed for solar driven sorption-based AWH by integrating ethanolamine-decorated CoCl₂ (E-CoCl₂), microfibrillated cellulose (MFC) and LiCl-decorated polypyrrole (Cl-ppy). The specimen can visually indicate the sorption process in real time while harvesting moisture, achieving a flexible response to changes in environmental humidity and solar radiation. Fabricating an open, unordered, interconnected skeleton in E-CoCl₂ using MFC can effectively enhance its sorption kinetics and also prevent the leakage of liquefied salt solution. The specimen has water sorption capacities of 0.39–2.05 kg kg⁻¹ under RH 25–85% within 3.5 h and can quickly desorb within 1.5 h under 1 sun. An AWH device can conduct 3 sorption/desorption cycles within 9 h during one day outdoors and produces 2.81 kg_water kg_sorbent⁻¹. This strategy is a promising approach to enable sustainable water delivery without geographical and hydrological limitations, especially for the landlocked communities and arid areas.

中文翻译：

用于太阳能驱动的多个大气集水循环的水分指示纤维素气凝胶

尽管用于应对清洁水短缺挑战的大气集水 (AWH) 技术蓬勃发展，但很少有研究关注可以实时指示水分变化的吸湿材料。在这里，通过整合乙醇胺装饰的 CoCl ₂ (E-CoCl ₂ )、微纤化纤维素 ( MFC) 和 LiCl 装饰的聚吡咯 (Cl-ppy)。样品在收获水分的同时，可以实时直观地显示吸附过程，实现对环境湿度和太阳辐射变化的灵活响应。在 E-CoCl _{2 中}制造开放、无序、互连的骨架使用 MFC 可以有效增强其吸附动力学，也可以防止液化盐溶液的泄漏。样品在 RH 25-85% 下 3.5 小时内具有 0.39-2.05 kg kg ^{-1 的}吸水能力，并且可以在 1 个阳光下在 1.5 小时内快速解吸。AWH 装置可以在户外一天的 9 小时内进行 3 次吸附/解吸循环，并产生 2.81 kg_水kg_吸附剂^-1。该战略是一种有前途的方法，可以在不受地理和水文限制的情况下实现可持续供水，特别是对于内陆社区和干旱地区。

更新日期：2021-10-27

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