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南京大学Nature Sustainability:巧妙发明!一种利用太阳能在废水中提氨的装置

  • 2026-04-10 06:26:04
南京大学Nature Sustainability:巧妙发明!一种利用太阳能在废水中提氨的装置

共同作者:Qi Zhang, Tianqi Wei, Minfei Fei 

通讯作者:徐凝,朱嘉

通讯单位:南京大学

文章链接:https://www.nature.com/articles/s41893-025-01609-6

今天,NewMIT小编为大家带来南京大学朱嘉/徐凝团队在 Nature Sustainability 发布的题为 “Solar-driven efficient and selective ammonia recovery from ammonium-containing wastewater” 的最新研究。全球每年对氨(NH₃)的需求已达数亿吨,传统生产仍依赖高温高压的哈伯–博施工艺,造成约1%的全球能源消耗和CO₂排放。与此同时,在化肥、纯碱等产业链的使用端,大量氨以NH₄⁺形式随废水排放;仅中国每年此类排放就超过1×10⁷ t。现行的NH₃回收技术往往先大量投加强碱来中和溶液中的H⁺并促使NH₄⁺生成可挥发的NH₃,再通过电加热蒸馏把氨气从液相带走,因而化学品用量、能耗和运行成本都很高。在“双碳”目标与废水治理需求的驱动下,研发无需额外碱剂并能利用可再生能源的绿色氨回收工艺已成为当务之急。

在此背景下,本研究开发了可漂浮的Amino-MXene Sponge(AMS)。材料将表面的-NH₂位点构建的局部可逆碱性与Ti₃C₂ MXene提供的界面光热效应耦合:在无需额外碱剂和外部能源的5 sun条件下,AMS在8h内即可实现0.6 mol m⁻²h⁻¹的NH₃回收速率,产物纯度99.8%;当光强提升至15 sun时,材料可“一照即再生”并同步副产0.67wt%的盐酸,实现“吸氨—吐酸”的闭环循环。生命周期评价显示,每生产1吨NH₃的碳足迹仅0.102 tCO₂e,远低于哈伯–博施(3.27 tCO₂e)和光伏-电氢路线(1.13 tCO₂e);技术经济分析预测,AMS每平方米年净利润可达91.3美元。由此,这一“漂浮海绵+太阳驱动”方案为含铵废水资源化提供了绿色、高效且具经济吸引力的新范式,并为全球氮循环的低碳转型描绘了可行的技术路线图。

核心创新

1.浮漂式局部碱化-界面光热协同材料设计

本研究构筑了可漂浮的AMS,在Ti₃C₂ MXene宽带光热骨架上高密度接枝-NH₂,形成疏上亲下的Janus结构,使海绵漂浮于水-气界面时能够同时捕获H⁺并定域升温,从而在热力学(平衡右移)和传质(挥发加速)两方面协同提升NH₃挥发速率。

2.无碱无外能的高通量氨回收-盐酸共生闭环

本研究利用该AMS在5 sun自然光下(无需投碱和外部加热)8h即可实现0.6 molm⁻²h⁻¹、纯度99.8%的NH₃高通量回收,并在光强升至15 sun时通过-NH₂·H⁺键的热解“一照再生”材料,同时获得10wt%的NH₃溶液与0.67wt%的盐酸,构建了完整的“吸氨-吐酸”闭环流程。

3.可完全光再生耐久性与多源废水适配性

本研究通过多轮强光循环和户外原型测试证明了AMS的耐久性与适配性:材料在不同阴离子体系(NH₄Cl、(NH₄)₂SO₄等)中仍保持高回收效率,且户外9h实测显示每平方米处理1.12 L含铵废水并回收约280 mL的高纯NH₃溶液,验证了其工程可行性。

4.低碳足迹与显著经济收益

本研究的生命周期评估表明,该太阳驱动策略生产1 t NH₃仅排放0.102 tCO₂-e(显著低于Haber-Bosch的3.27 t和光伏-电氢路线的1.13 t),而技术经济分析预测AMS可实现年净利润91.3 USDm⁻²、投资回收期约3.5年,展现了兼具减碳与盈利的绿色氮循环范式。

图文导读

图1   传统氨回收与本研究中的氨回收比较

图1展示了传统“投碱+电加热”路线与本研究提出的AMS太阳驱动策略的机理差异:前者需大量碱剂捕获H⁺且依赖电加热蒸氨,成本与能耗双高;后者利用-NH₂基团局部“锁”H⁺,并借Ti₃C₂光热实现界面蒸氨,无需外加化学品和能源。强光下AMS还能“一键光再生”并同步产出0.67wt%的盐酸,形成“吸氨-吐酸”闭环,从热力学与传质双重维度推动反应平衡向NH₃生成侧位移。

图2  AMS的制备与表征

图2详述三步法(Ti₃C₂浸渍→碳化→APTES/FAS修饰)制备的大块海绵仍保持40–200 µm孔道。紫外-近红外光谱表明AMS对整个太阳光谱的平均吸收率约96%,3–10 sun条件下表面温度可由167 °C提升至320 °C,实现高效界面光热。接触角测试确认上层疏水/下层亲水的Janus结构;FTIR与XPS新出现Ti-O-Si与N-H峰证实-NH₂成功嫁接,HCl-TPD显示200–400 °C可稳定捕-放H⁺,为可逆再生提供依据。

图3 太阳驱动NH₃回收性能与机理验证

图3系统评估了AMS在不同光强下的回收表现:NH₃溶液浓度随光强由1 sun升至5 sun从0.45wt%增至1.04wt%,并在5 sun条件下取得0.6 mol m⁻² h⁻¹、99.8%纯度的NH₃回收速率;当光强升至10 sun,“吐酸”再生机制导致浓度略降。COMSOL模拟与HCl-TPD/原位FTIR共同揭示:-NH₂基团显著降低界面H⁺浓度、提高NH₃浓度梯度,对HCl拥有更强亲和力,实现NH₃/HCl原位分离。通过五级串联蒸发,氨水浓度最高可达9.56wt%,且在五轮光再生后性能几乎无衰减。

图4 户外原型验证与太阳氮肥示范

图4描述了0.92 kW m⁻²峰值通量下的1 m²户外原型:在9 h内处理1.12 L的NH₄⁺废水并回收约280 mL纯NH₃溶液,COD与Na⁺/K⁺/Ca²⁺/Mg²⁺去除率均大于99%。所获氨水直接用于生菜栽培,20天对比显示施肥组长势明显优于对照,验证了“太阳氮肥”的无毒增产潜力。

图5 生命周期-经济评估与应用潜力

图5基于中国24个省份年排NH₄Cl废水量,预测AMS每年可同时回收16.5 kg m⁻²的NH₃与5.9 kg m⁻²的HCl(以江苏为例),展现大规模资源化潜力。完整LCA显示单位NH₃碳排仅0.102 tCO₂e,远低于Haber-Bosch(3.27 t)与光伏-电氢制氨(1.13 t);技术经济分析预测AMS净利润可达91.3 USDm⁻²·年,投资回收期约3.5年,兼具减碳与盈利能力。

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  1. CONNECT:[ UseTime:0.000330s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000567s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000306s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000292s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000480s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000533s ]
  8. SELECT * FROM `article` WHERE `id` = 528343 LIMIT 1 [ RunTime:0.000406s ]
  9. UPDATE `article` SET `lasttime` = 1777049681 WHERE `id` = 528343 [ RunTime:0.000719s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000360s ]
  11. SELECT * FROM `article` WHERE `id` < 528343 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000441s ]
  12. SELECT * FROM `article` WHERE `id` > 528343 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000441s ]
  13. SELECT * FROM `article` WHERE `id` < 528343 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001261s ]
  14. SELECT * FROM `article` WHERE `id` < 528343 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001030s ]
  15. SELECT * FROM `article` WHERE `id` < 528343 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001136s ]
0.074091s