数字农科院2.0

Enabling closed-loop water recycling in greenhouses: An alginate composite gel and TEC-driven atmospheric water harvester for continuous humidity regulation and water reuse

文献类型： 外文期刊

作者： Bai, Qi;Cui, Wenzhong;Qi, Zhiyong;Zhou, Wanlai

作者机构：

关键词： Atmospheric water harvesting;Composite gel;Thermoelectric cooling;Humidity regulation;Closed-loop water recycling

期刊名称： CHEMICAL ENGINEERING JOURNAL

ISSN： 1385-8947

年卷期： 2025 年 527 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Addressing the dual challenges of water scarcity and excessive humidity in greenhouse agriculture, this study proposes an integrated atmospheric water harvesting (AWH) system driven by a novel alginate-based composite gel and thermoelectric cooling (TEC) technology. The hygroscopic gel SPA-Li-15 was synthesized through freeze-drying of sodium alginate (SA) cross-linked with polyvinyl alcohol (PVA) and activated carbon fiber (ACF), followed by LiCl impregnation. This material exhibits exceptional water uptake of 2.65 g/g at 25 degrees C and 90 % RH attributed to its hierarchical porous structure and enhanced hydrophilic sites. Crucially, to overcome the limitation of solar-dependent desorption, a TEC-driven AWH device was engineered for active, light-free water release. The system achieves 8 adsorption-desorption cycles per day with >85 % sorption capacity retention, enabling continuous humidity regulation (RH <70 % in simulated greenhouse environments) and daily water yield of 1.664 L/m(2)/day. By synergizing material innovation with energy-efficient engineering, this work establishes a closed-loop water recycling paradigm for greenhouses, providing 23.3 % to 46.6 % of the average water requirement for greenhouses while maintaining the best crop growth conditions. The strategy offers a scalable solution for sustainable agriculture in arid regions.

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