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

IF 1.6 Q4 ENGINEERING, BIOMEDICAL Biosurface and Biotribology Pub Date : 2023-02-15 DOI:10.1049/bsb2.12056

Jiayu Song, Zhang Liu, Jhoanne Pedres Boñgol, Zhaoxin Zhang, King Lun Yeung

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引用次数: 1

Abstract

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°C 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 long-term operations, providing a fast, reliable, and sustainable moisture removal and water harvesting tool.

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一种具有快速、节能脱水和回收功能的大气水收集器

从空气中去除水分和回收水分对于调节室内湿度和缓解水资源短缺至关重要。大多数大气水收集器(AWH)主要侧重于提高水分捕获率，但为了经济和可持续，必须考虑回收和收集捕获的水所需的能量。本文介绍了一种由绿色环保材料制成的机械柔性、亲疏吸附型AWH。它将吸湿性壳聚糖聚合物嵌入柔性疏水性二氧化硅干凝胶中，在97%的相对湿度和25°C下，可获得86.3 g水/g壳聚糖，30天后达到饱和(即2.88 g水/g壳聚糖/天)。机械挤压(约0.020 MPa)在150 s内回收了约88%的吸附水分。反复的集水实验和单轴压缩试验表明，壳聚糖-二氧化硅干凝胶在长期工作中是耐用的，提供了一种快速、可靠、可持续的除湿和集水工具。

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