Zhang Yi, Wang Feifei, Yu Yongtao, Wu Jiajia, Cai Yingying, Shi Jian, Morikawa Hideaki, Zhu Chunhong
Graduate School of Medicine, Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan.
Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan.
Chem Eng J. 2023 Jun 15;466:143330. doi: 10.1016/j.cej.2023.143330. Epub 2023 May 5.
In recent years, with the outbreak and epidemic of the novel coronavirus in the world, how to obtain clean water from the limited resources has become an urgent issue of concern to all mankind. Atmospheric water harvesting technology and solar-driven interfacial evaporation technology have shown great potential in seeking clean and sustainable water resources. Here, inspired by a variety of organisms in nature, a multi-functional hydrogel matrix composed of polyvinyl alcohol (PVA), sodium alginate (SA) cross-linked by borax as well as doped with zeolitic imidazolate framework material 67 (ZIF-67) and graphene owning macro/micro/nano hierarchical structure has successfully fabricated for producing clean water. The hydrogel not only can reach the average water harvesting ratio up to 22.44 g g under the condition of fog flow after 5 h, but also be capable of desorbing the harvested water with water release efficiency of 1.67 kg m h under 1 sun. In addition to excellent performance in passive fog harvesting, the evaporation rate over 1.89 kg m h is attained under 1 sun on natural seawater during long-term. This hydrogel indicates its potential in producing clean water resources in multiple scenarios in different dry or wet states, and which holds great promise for flexible electronic materials and sustainable sewage or wastewater treatment applications.
近年来，随着新型冠状病毒在全球的爆发和流行，如何从有限的资源中获取清洁用水已成为全人类迫切关注的问题。大气水收集技术和太阳能驱动的界面蒸发技术在寻求清洁和可持续水资源方面显示出巨大潜力。在此，受自然界中多种生物的启发，成功制备了一种由聚乙烯醇（PVA）、经硼砂交联的海藻酸钠（SA）以及掺杂沸石咪唑框架材料67（ZIF-67）和石墨烯组成的具有宏观/微观/纳米分级结构的多功能水凝胶基质，用于生产清洁水。该水凝胶在雾流条件下5小时后平均集水率可达22.44 g/g，并且能够在1个太阳光照下以1.67 kg m⁻² h⁻¹的水释放效率解吸收集到的水。除了在被动雾收集方面具有优异性能外，在自然海水中长期1个太阳光照下蒸发速率超过1.89 kg m⁻² h⁻¹。这种水凝胶表明其在不同干湿状态的多种场景中生产清洁水资源方面具有潜力，并且在柔性电子材料以及可持续污水或废水处理应用方面具有广阔前景。
