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南京大学&海南大学,最新Nature Water!

  • 2026-04-10 06:22:03
南京大学&海南大学,最新Nature Water!
在全球范围内,淡水短缺与耕地资源紧张正成为制约农业发展的关键瓶颈。尤其是在沿海地区,虽然拥有丰富的海水资源,却长期面临灌溉用水不足与土壤盐碱化问题。传统海水淡化农业虽然提供了一条路径,但仍存在能耗高、成本高以及硼污染等难题,难以实现大规模可持续应用。与此同时,传统农业模式以“获取—生产—废弃”为主,资源利用效率低,环境负担沉重,亟需向循环利用模式转型。
针对这些挑战,南京大学朱嘉宋琰联合海南大学肖娟秀海南医科大学Tao Yang提出了一种“太阳能驱动循环海水农业系统”。该系统以太阳能为核心驱动力,将海水转化为高质量灌溉水,同时实现农作物生产与农业废弃物的高值利用,构建“水—食物—材料”闭环循环体系。通过在海南开展为期3个月的实地验证,研究成功实现了从种子萌发、作物生长到收获加工及废弃物再利用的完整循环,并展示出显著的水资源利用效率与农业产出能力,为解决水资源短缺与粮食安全问题提供了全新思路。相关成果以“Solar-powered circular desalination agriculture enabled by amyloid fibril-based bioevaporators”为题发表在《Nature Water》上,Meng Xia, 宋琰, Jiahui YuMengyue Zeng为共同第一作者。
从“线性农业”到“循环系统”:概念构建
论文首先提出了整个系统的核心框架。如图1所示,研究构建了一个由“水-食物循环”和“材料循环”耦合而成的闭环体系。在这一体系中,太阳能驱动界面蒸发实现海水淡化,产生无硼的高质量淡水用于灌溉,同时也可供居民饮用;大豆作为核心作物,不仅提供蛋白质与多种食品,还在加工过程中产生副产物。更关键的是,这些农业废弃物并没有被丢弃,而是被“反哺”系统:大豆粕被转化为生物蒸发器材料,大豆秸秆则制备成肥料用于土壤改良。通过这一设计,农业不再是单向消耗资源的过程,而是一个不断自我循环、自我强化的系统,实现真正意义上的可持续农业。这种“边生产、边再生”的模式,也为未来农业提供了重要范式。
图1:循环海水农业整体框架,展示水-食物与材料双循环系统
从废弃物到功能材料:生物蒸发器的构建
系统的关键在于“生物蒸发器”的设计。图2a展示了其制备流程:研究团队以大豆加工废弃物为原料,通过蛋白提取、纤维化、定向冷冻干燥以及原位功能化等步骤,将其转化为具有特定结构的功能材料。在图2b–d中可以看到,这些材料内部形成了由淀粉样蛋白纤维构成的三维网络结构,并通过聚吡咯(PPy)进行光热功能修饰。这种结构不仅具有高比表面积,还具备良好的机械稳定性和分子间相互作用,使其在海水环境中依然保持稳定。图2e则展示了放大后的蒸发器实物,其尺寸可达15 cm,说明该方法具备规模化潜力。这一设计的巧妙之处在于:材料本身来源于农业废弃物,同时又服务于农业生产,实现“材料自循环”。相比传统需要高温碳化的蒸发材料,该方法更加绿色、低能耗。
进一步来看材料性能,图2f显示淀粉样纤维的形成通过荧光增强得到验证;图2c中的垂直排列通道(约100 μm)为水分输运和蒸汽释放提供了“高速通道”。图2g表明,该材料在250–2500 nm波段内具有超过92%的光吸收能力,在1个太阳光照条件下,仅2分钟即可升温至76.5°C,实现高效光热转换。与此同时,图2h显示其极强的亲水性,可在10秒内吸收超过自身22倍质量的水。此外,图2i揭示了其优异的力学性能:在60%压缩应变下仍可完全恢复,保证其在复杂海洋环境中的长期稳定运行。这种兼具“高吸光、高导水、高稳定”的材料,是实现高效太阳能蒸发的核心基础。
图2:生物蒸发器的制备流程及微观结构与性能
从实验室到田间:淡化性能与稳定性
在图3a中,研究对比了不同淡化方式的产水能力。结果显示,界面太阳能蒸发系统可达到8.29 mm·day¹的产水量,远高于自然蒸发(约2 mm·day¹),完全满足大豆各生长阶段的用水需求。图3b进一步对比了水质,太阳蒸馏水不仅盐分更低,而且将硼含量降至0.18 mg·L⁻¹,远低于农业安全阈值。这一点尤为关键,因为传统反渗透水中的硼含量较高,会对作物产生毒性。在长期稳定性方面,图3c显示蒸发器表面的盐分可在60分钟内完全溶解,不会积累;图3d表明其在30天连续运行中保持稳定产水性能。更令人关注的是抗生物污染能力。图3e–g显示,该材料对多种海洋细菌的灭活率超过99.99%,有效避免了传统蒸发系统易被污染的问题,大幅提升系统寿命。
图3:蒸发器的产水性能、水质优势及抗污染能力
真正“种出来”的验证:农业实地实验
在海南的实地实验中,研究团队对比了三种灌溉方式(图4a):太阳能淡化、反渗透淡化和自然蒸发。图4b直观展示了植物生长差异:太阳能淡化组生长最为旺盛,而自然蒸发组几乎无法正常发育。图4c进一步量化结果,太阳能淡化在发芽率、株高、叶面积等指标上均显著领先。图4d揭示了关键原因:反渗透水导致叶片出现明显黄化(硼毒性),而太阳蒸馏水完全避免这一问题。最终产量对比(图4e,f)更具说服力:太阳能淡化条件下,大豆单株荚数、总产量等均显著高于其他方法。这意味着不仅“能种”,而且“种得更好”。
图4:不同灌溉方式下的大豆生长与产量对比
可扩展性与现实意义:走向实际应用
在规模化验证中(图5a),系统已扩展至11 m × 6 m的农田,并可与现有滴灌系统兼容,显示出良好的工程适配性。图5b展示了其广泛适用性:不仅能种植大豆,还可支持蔬菜和经济作物(如玫瑰)生长。图5c则从系统层面分析物质流:所有输入仅为阳光、海水和少量化学品,而输出包括粮食、饮用水、油脂等,同时所有废弃物均被循环利用,真正实现“零废弃农业”。更具现实意义的是图5d的估算:在0.6公顷土地上,该系统可满足1853人的饮水需求、237人的蛋白需求以及47人的基本粮食需求,展示出极高的社会价值。
图5:系统规模化应用、作物适配性及资源循环与产出能力
总结与展望
总体来看,这项研究首次系统性地构建并验证了“太阳能驱动循环海水农业”模式,通过材料创新与系统设计的深度融合,实现了水资源获取、粮食生产与废弃物循环的协同优化。该系统不仅解决了传统海水农业中的能耗与污染问题,还通过去硼优势显著提升作物产量与品质。未来,这一技术有望在全球沿海及缺水地区推广,推动农业从“资源消耗型”向“循环再生型”转变。同时,随着太阳能蒸发材料与智能农业技术的发展,该系统还可进一步集成自动化与规模化能力,成为保障全球水-粮-能安全的重要解决方案。
 来源 :高分子科学前沿。本文转载仅用于分享与交流,不涉及商业用途。版权归原作者所有,如有侵权,请联系我们删除。
 投稿、合作邮箱:xh@chinawatertech.com

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  1. CONNECT:[ UseTime:0.001244s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001475s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000761s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000651s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001496s ]
  6. SELECT * FROM `set` [ RunTime:0.000669s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001598s ]
  8. SELECT * FROM `article` WHERE `id` = 528181 LIMIT 1 [ RunTime:0.001112s ]
  9. UPDATE `article` SET `lasttime` = 1777075048 WHERE `id` = 528181 [ RunTime:0.003481s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001308s ]
  11. SELECT * FROM `article` WHERE `id` < 528181 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001290s ]
  12. SELECT * FROM `article` WHERE `id` > 528181 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003549s ]
  13. SELECT * FROM `article` WHERE `id` < 528181 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003625s ]
  14. SELECT * FROM `article` WHERE `id` < 528181 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003542s ]
  15. SELECT * FROM `article` WHERE `id` < 528181 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006240s ]
0.210000s