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<p>Solar-driven atmospheric water harvesting (SAWH) offers a promising strategy for improving water-use efficiency in greenhouse cultivation. In this study, a low-cost, biodegradable photosensitive hydrogels prepared by polyaspartic acid (PASP) and carbon nanotubes (CNTs) were served to agricultural water management in arid regions. The optimized hydrogel (1.5-CNTs-PASP) exhibited a water uptake of 1.55&#xa0;g g<sup>− 1</sup> within 2.5&#xa0;h under simulated nocturnal conditions (20&#xa0;°C, 80% RH) and achieved a rapid desorption rate of 1.53% min<sup>− 1</sup> under 800&#xa0;W m<sup>− 2</sup> of irradiation. When integrated into an evaporation-transpiration recycling device (ETRD), the hydrogel enables passive nighttime moisture capture and daytime solar-driven water release, reducing irrigation demand by up to 45% in tomato seedling cultivation without compromising plant growth. Results also revealed the landfilling of post-used hydrogel could enhance soil microbial diversity and enzyme activities, inferring favorable ecological compatibility. Cost analysis revealed $0.08 ~ 0.12&#xa0;L<sup>− 1</sup> of water was realized, suggesting the high practical feasibility of the novel 1.5-CNTs-PASP hydrogel. This work presents an integrated strategy combining efficient water harvesting, agricultural application, and ecological safety for sustainable farming in water-scarce regions.</p>

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An eco-friendly photosensitive hydrogel for food security in arid regions

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月20日

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  • Ying Peng,
  • Zihao Liao,
  • Chaoqun Fan,
  • Mengting Yang,
  • Shize Zheng,
  • Bo Chen,
  • Di Cai,
  • Hui Cao,
  • Tianwei Tan,
  • Jianbo Zhao

摘要

Solar-driven atmospheric water harvesting (SAWH) offers a promising strategy for improving water-use efficiency in greenhouse cultivation. In this study, a low-cost, biodegradable photosensitive hydrogels prepared by polyaspartic acid (PASP) and carbon nanotubes (CNTs) were served to agricultural water management in arid regions. The optimized hydrogel (1.5-CNTs-PASP) exhibited a water uptake of 1.55 g g− 1 within 2.5 h under simulated nocturnal conditions (20 °C, 80% RH) and achieved a rapid desorption rate of 1.53% min− 1 under 800 W m− 2 of irradiation. When integrated into an evaporation-transpiration recycling device (ETRD), the hydrogel enables passive nighttime moisture capture and daytime solar-driven water release, reducing irrigation demand by up to 45% in tomato seedling cultivation without compromising plant growth. Results also revealed the landfilling of post-used hydrogel could enhance soil microbial diversity and enzyme activities, inferring favorable ecological compatibility. Cost analysis revealed $0.08 ~ 0.12 L− 1 of water was realized, suggesting the high practical feasibility of the novel 1.5-CNTs-PASP hydrogel. This work presents an integrated strategy combining efficient water harvesting, agricultural application, and ecological safety for sustainable farming in water-scarce regions.