An atmospheric water harvester with fast and energy-saving water removal and recovery  

作　　者：Jiayu Song Zhang Liu Jhoanne Pedres Boñgol Zhaoxin Zhang King Lun Yeung 

机构地区：[1]Department of Chemical and Biological Engineering,the Hong Kong University of Science and Technology,Kowloon,Hong Kong [2]Division of Environment and Sustainability,the Hong Kong University of Science and Technology,Kowloon,Hong Kong [3]Division of Emerging Interdisciplinary Areas,The Hong Kong University of Science and Technology,Kowloon,Hong Kong [4]HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute,Shenzhen,Guangdong,China

出　　处：《Biosurface and Biotribology》2023年第1期9-16,共8页生物表面与生物摩擦学（英文）

基　　金：Innovation and Technology Commission,Grant/Award Number:ITS/022/15;Research Grants Council,University Grants Committee,Grant/Award Number:E-HKUST601/17;The European Union-Hong Kong Research and Innovation Cooperation Co-funding Mechanism,Grant/Award Number:E-HKUST601/17;The European Union's Horizon 2020,Grant/Award Number:BIORIMA;the Project of Hetao Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone,Grant/Award Number:HZQB-KCZYB-2020083。

摘　　要：Moisture removal and water recovery from the air are vital for regulating indoor humidity and mitigating water scarcity.Most atmospheric water harvesters(AWH)focus primarily on increasing the moisture capture rate,but for it to be economical and sustainable,it is essential to consider the energy required to recover and harvest the captured water.Here,a mechanically flexible,biphilic sorption-based AWH made of green,environmentally friendly material is presented.It consists of a hygroscopic chitosan polymer embedded within a flexible,hydrophobic silica xerogel that can harvest 86.3 g water/g chitosan at 97%relative humidity and 25℃reaching saturation after 30 days(i.e.2.88 g water/g chitosan/day).Roughly 88%of the sorbed moisture was recovered by mechanical squeezing(ca.0.020 MPa)within 150 s.Repeated water harvesting experiments and uniaxial compression tests demonstrate that chitosan-silica xerogel is durable for longterm operations,providing a fast,reliable,and sustainable moisture removal and water harvesting tool.

关 键 词：atmospheric water harvesting flexible xerogel heterogeneous wettability mechanical water recovery 

分 类 号：X703[环境科学与工程—环境工程]