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Cellulose-based bi-layer hydrogel evaporator with a low evaporation enthalpy for efficient solar desalination
Carbohydrate Polymers ( IF 10.7 ) Pub Date : 2023-12-15 , DOI: 10.1016/j.carbpol.2023.121695 Lian Shu 1 , Xiong-Fei Zhang 1 , Zhongguo Wang 1 , Jun Liu 2 , Jianfeng Yao 1
Carbohydrate Polymers ( IF 10.7 ) Pub Date : 2023-12-15 , DOI: 10.1016/j.carbpol.2023.121695 Lian Shu 1 , Xiong-Fei Zhang 1 , Zhongguo Wang 1 , Jun Liu 2 , Jianfeng Yao 1
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Interfacial evaporation through hydrogel-based evaporators is emerging as a sustainable and cost-effective strategy for drinkable water production. Herein, a specially designed bi-layer hydrogel evaporator was fabricated and used for efficient solar water desalination. With cotton linter as cellulose precursor, it was dispersed in a highly concentrated ZnCl (65 %) solution, and cross-linked by epichlorohydrin to prepare cellulose composite hydrogel. After removing inorganic salts by salt-leaching, polyaniline (PANi) with broadband and wide-range light absorption was then integrated into the top surface of hydrogel through polymerization to construct a bi-layer evaporator. As a solar evaporator, the water could be evaporated with a low-energy demand, and the heat from the sunlight could be confined at the interface to achieve efficient water evaporation. Therefore, the hydrogel evaporator demonstrates an optimal water evaporation rate of 3.02 kg m h and photothermal conversion efficiency of 89.09 % under 1 sun (1 kW m) irradiation. This work provides new possibilities for efficient solar water purification systems with assured water quality.
中文翻译：
具有低蒸发焓的纤维素基双层水凝胶蒸发器，用于高效太阳能海水淡化
通过基于水凝胶的蒸发器进行界面蒸发正在成为饮用水生产的可持续且具有成本效益的策略。在此，制造了一种专门设计的双层水凝胶蒸发器并用于高效的太阳能海水淡化。以棉绒为纤维素前驱体，将其分散在高浓度ZnCl（65%）溶液中，通过环氧氯丙烷交联制备纤维素复合水凝胶。通过盐浸去除无机盐后，具有宽带和宽范围光吸收的聚苯胺（PANi）通过聚合集成到水凝胶的顶面，构建双层蒸发器。作为太阳能蒸发器，水可以在低能量需求下蒸发，并且来自阳光的热量可以被限制在界面处以实现水的高效蒸发。因此，水凝胶蒸发器在1太阳（1 kW m）照射下表现出3.02 kg·m·h的最佳水蒸发速率和89.09％的光热转换效率。这项工作为高效太阳能水净化系统和有保证的水质提供了新的可能性。
更新日期：2023-12-15
中文翻译：
具有低蒸发焓的纤维素基双层水凝胶蒸发器，用于高效太阳能海水淡化
通过基于水凝胶的蒸发器进行界面蒸发正在成为饮用水生产的可持续且具有成本效益的策略。在此，制造了一种专门设计的双层水凝胶蒸发器并用于高效的太阳能海水淡化。以棉绒为纤维素前驱体，将其分散在高浓度ZnCl（65%）溶液中，通过环氧氯丙烷交联制备纤维素复合水凝胶。通过盐浸去除无机盐后，具有宽带和宽范围光吸收的聚苯胺（PANi）通过聚合集成到水凝胶的顶面，构建双层蒸发器。作为太阳能蒸发器，水可以在低能量需求下蒸发，并且来自阳光的热量可以被限制在界面处以实现水的高效蒸发。因此，水凝胶蒸发器在1太阳（1 kW m）照射下表现出3.02 kg·m·h的最佳水蒸发速率和89.09％的光热转换效率。这项工作为高效太阳能水净化系统和有保证的水质提供了新的可能性。
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