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南京大学Nature communicationa:沸石动态羟基循环技术 高效去除饮用水中短链 / 超短链 PFAS

  • 2026-03-31 03:24:21
南京大学Nature communicationa:沸石动态羟基循环技术 高效去除饮用水中短链 / 超短链 PFAS

近日,南京大学污染控制与资源化研究国家重点实验室、环境学院的研究团队在《Nature Communications》发表重要研究成果,提出一种基于沸石的动态羟基循环新策略,仅以水为介质实现商用沸石的吸附 - 再生循环,可高效、可持续去除饮用水中的短链及超短链全氟 / 多氟烷基物质(PFAS),为解决全球 PFAS 污染危机提供了低成本、易推广的饮用水净化方案,相关研究成果 doi:10.1038/s41467-026-70507-y。

PFAS 因难以降解被称为 “永久化学物”,随着传统长链 PFAS 逐步淘汰,短链(C4-C7)和超短链(C<4)PFAS 成为饮用水中主要的 PFAS 污染物,且其生物毒性不亚于甚至高于长链 PFAS。传统水处理方法对这类亲水性 PFAS 去除效果差,而现有吸附材料改性技术难以兼顾吸附效率与再生能力,导致饮用水深度净化成本居高不下,难以普及。

针对这一痛点,研究团队摒弃传统的官能团固定化改性思路,开发了非固定化动态羟基循环技术。该技术通过水蒸气扩散法,在商用沸石纳米孔道中构建 “沸石骨架限域水” 结构,仅以水为试剂驱动 Si-OH 和限域水 - 羟基网络的动态循环,无需额外添加化学试剂。实验证实,该策略让沸石形成了独特的 “沸石骨架 - 限域水” 双结合模式,既通过范德华力结合 PFAS 的 C-F 疏水链,又以限域水的氢键作用结合其亲水端,同时降低了纳孔扩散的脱水能垒,大幅提升了纳孔可及性。

研究中优选的 β200 沸石(BEA 晶型,Si/Al=200)经该技术改性后(S-D-β200),对 C-F 数 1-6 的短链 / 超短链 PFAS 的吸附容量达 233.82-733.13 mg g⁻¹,为目前已报道的最高水平之一,较原始沸石提升 1.41-2.26 倍。该材料在含腐殖酸、氯化钠的模拟实际水体中仍保持高选择性,PFAS 去除率仅下降 0%-10.9%,且经 800℃热再生后,四次循环的吸附容量恢复率达 94.3%-101.3%,热再生过程还可完全降解吸附的 PFAS,打破其环境循环。

团队进一步将改性沸石应用于家用净水器的工程化验证,替换商用净水器末端的压缩活性炭柱,构建了三级净化装置(PP 棉 - 颗粒活性炭 - S-D-β200)。模拟四口之家日常用水模式(8 L / 天)的 182 天全尺度连续净化实验显示,该装置对饮用水中短链 / 超短链 PFAS 的平均去除率达 73%-95%,优于商用净水器(44%-90%),可与反渗透净水器性能比肩,且在 179 天内将高浓度 PFAS 污染饮用水降至欧盟议会和理事会设定的健康限值以下,同时不影响水中溶解性有机物、重金属的去除效果。

该技术的核心优势在于低成本、易原位升级,仅通过水蒸气扩散和热再生即可实现沸石的循环利用,无需复杂的化学改性工艺,可直接对现有饮用水净化设备进行改造,大幅降低全生命周期成本。这为欠发达地区获得无短链 / 超短链 PFAS 的安全饮用水提供了可行路径,也为解决饮用水中新兴亲水性污染物去除难题提供了新的技术思路。

该研究由Yuanji Shi, Minghao Yang, Hongxin Mu, Haidong Hu& Hongqiang Ren完成,研究得到国家自然科学基金基础科学中心项目、国家自然科学基金等资助。

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继续阅读?点击链接阅读其他系列文章、
#抗生素#微塑料#全氟化合物
#纳米塑料
#有机磷酸酯#新污染物分析技术
#内分泌干扰物#新污染物处理技术#科研动态
#PFAS
#液晶单体

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  1. CONNECT:[ UseTime:0.000463s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000583s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005230s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000273s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000525s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000540s ]
  8. SELECT * FROM `article` WHERE `id` = 506413 LIMIT 1 [ RunTime:0.000391s ]
  9. UPDATE `article` SET `lasttime` = 1774994278 WHERE `id` = 506413 [ RunTime:0.017408s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000358s ]
  11. SELECT * FROM `article` WHERE `id` < 506413 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000420s ]
  12. SELECT * FROM `article` WHERE `id` > 506413 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003750s ]
  13. SELECT * FROM `article` WHERE `id` < 506413 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000873s ]
  14. SELECT * FROM `article` WHERE `id` < 506413 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000712s ]
  15. SELECT * FROM `article` WHERE `id` < 506413 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000722s ]
0.101642s