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《AM》盐模板结晶生成定向互连的大孔聚合物凝胶,用于超快和高容量大气水收集

《AM》盐模板结晶生成定向互连的大孔聚合物凝胶,用于超快和高容量大气水收集

一、 摘要

本文提出盐模板结晶诱导受限聚合策略,制备定向互连大孔聚合物凝胶(STC/TiN-gel@LiCl),用于吸附型大气水收集(SAWH)。该材料结合 PAMPS 与 LiCl 的协同作用、定向多级孔结构,实现7.19 g g⁻¹ 吸湿量、1.96 g g⁻¹ h⁻¹ 超快吸附动力学、1 太阳光下 60 min 脱附 96.8%;20 次循环保持 90.4% 性能无盐泄漏;低温中湿环境下日产水量3.29 kg kg⁻¹ day⁻¹,为高效大气水收集提供新范式。

二、 引言

背景:全球淡水稀缺,2050 年超半数人口将面临缺水,大气水收集(AWH)是可持续解决方案。

现有问题:传统盐基吸湿材料吸附容量低、动力学慢、扩散壁垒高;定向冷冻造孔易牺牲力学稳定性,能耗高、难放大;无序孔阻碍水汽传输。

创新思路:利用乙酸钠三水合物过冷结晶,触控引发异相成核与定向生长,构建定向互连大孔结构,兼顾快速传输、高容量存储与力学稳定。

三、 结论

核心突破:触控盐结晶可调控孔尺寸与方向,制备定向互连大孔水凝胶,显著提升吸附动力学与容量。

关键性能:30%–90% RH 下吸湿量 1.10–7.19 g g⁻¹;1 太阳光下 60 min 脱附 96.8%;20 次循环保留 90.4% 性能。

实际应用:户外低温低湿环境日产水量 3.29 kg kg⁻¹ day⁻¹,同步产水发电(吸附 50 mV、脱附 111 mV),水质达标 WHO 饮用水标准。

价值:为便携式、低成本、高产率太阳能驱动 SAWH 系统提供新路径,实现水–电联产。

图解

图 1   

盐模板结晶法制备用于超快、大容量大气水收集的定向互连大孔聚合物凝胶(a) STC/TiN‑gel@LiCl 制备流程示意图(b) 阐释 STC/TiN‑gel@LiCl 静电发电联产机制的示意图(d) 本研究与已有工作在吸水容量、吸附速率、脱附速率、日产水量及循环稳定性方面对比的雷达图

图 2  

STC 凝胶的设计与表征

(a) 盐模板诱导结晶与聚合过程示意图:(i) 前驱体溶液处于完全熔融状态;(ii) 接触触发后晶体沿触发方向定向生长;(iii) 紫外光引发光聚合,固定取向多孔网络。(b) 采用荧光金相显微镜记录触控诱导结晶过程中晶相生长的全过程。(c) 不同过冷度下制备的 STC 凝胶的扫描电镜 (SEM) 微观结构。(d) 结晶过程中不同过冷度下制备的 STC 凝胶的孔隙率表征。(e) 升温速率为 2℃/min 时,STC 凝胶前驱体溶液在−80℃~100℃温度范围内的差示扫描量热 (DSC) 曲线。(f) 不同状态下 STC 凝胶前驱体溶液的 X 射线衍射 (XRD) 图谱,橙色为三水合乙酸钠标准图谱作为参考。(g) STC/TiN 凝胶、普通凝胶 (R‑gel) 与 STC/TiN‑gel@LiCl 的傅里叶变换红外光谱 (FTIR) 图谱。

图3

STC 凝胶的吸水性能

(a) 基于菲克第二定律拟合的吸附动力学曲线。(b) 水蒸气扩散系数(\(D_{ms}\))与相对湿度的关系。(c) 采用 COMSOL Multiphysics 模拟的不同结构内水蒸气传输路径与速率。(d) 不同温度下的平衡吸附容量。(e) STC‑gel@LiCl、RSC‑gel@LiCl 与 R‑gel@LiCl 在 30%、50%、70% 和 90% 相对湿度下的平衡吸附容量。(f) STC/TiN‑gel@LiCl 与当前最先进的大气水收集(AWH)材料在 30%–90% 相对湿度范围内的静态吸附容量与吸附速率对比。

图4 

分子动力学模拟

(a) STC/TiN‑gel@LiCl 体系计算模型及随模拟时间变化的水分子动态过程快照(b) 水分子渗透过程的微观示意图(c) 体系内氢键数量随模拟时间的演变(d) 聚合物链上磺酸基团氧原子与水分子氢原子之间的径向分布函数 g (r)(e) 水分子平均累积配位数随径向距离 r 的分布

图 5 

STC/TiN‑gel@LiCl 的水脱附性能

(a) STC/TiN‑gel@LiCl 的水脱附示意图。(b) 水合态 STC/TiN‑gel@LiCl 与 R/TiN‑gel@LiCl 的太阳光吸收光谱;黄色阴影区域代表经标准 AM 1.5G 太阳光谱加权后的太阳光谱辐照度。(c) 1 倍太阳光照射下,STC/TiN‑gel@LiCl、RSC/TiN‑gel@LiCl 与 R/TiN‑gel@LiCl 的时间–温度曲线。(d) 25℃、70% 相对湿度下达到吸湿饱和的 STC/TiN‑gel@LiCl,在 0.5–1.5 倍太阳光照射强度下的水脱附曲线。(e) 25℃下不同湿度环境达到饱和的 STC/TiN‑gel@LiCl,在 1 倍太阳光照射下测得的水脱附曲线。(f) 25℃、70% 相对湿度下吸湿饱和后,1 倍太阳光照射下 STC/TiN‑gel@LiCl、RSC/TiN‑gel@LiCl 与 R/TiN‑gel@LiCl 的水脱附时间曲线及脱附速率。(g) STC/TiN‑gel@LiCl 的变温傅里叶变换红外光谱(VT‑FTIR),升温速率 10℃/min,每 5 分钟采集一次数据。(h) 相同含水量(1–3 g g⁻¹)的 STC/TiN‑gel@LiCl 与 R/TiN‑gel@LiCl 在水分蒸发过程中,由差示扫描量热法(DSC)测得的热流曲线。(i) 不同吸水倍率下,STC/TiN‑gel@LiCl 与 R/TiN‑gel@LiCl 的脱附焓(ΔHsp)数值。

图 6  

所制备 STC/TiN‑gel@LiCl 的户外吸附型大气水收集(SAWH)实验

(a) STC/TiN‑gel@LiCl 的循环性能:在 25℃、90% 相对湿度下进行吸湿,随后在 100℃烘箱中脱附,连续测试 20 个循环。(b) 基于 STC/TiN‑gel@LiCl 的实用化装置实物图,展示白天太阳能驱动脱附取水过程。(c) 环境参数(相对湿度、温度、质量、光照强度)实时监测数据。(d) 户外集水过程中的质量变化,包括吸湿、脱附与淡水收集量。(e) 基于全球年均温度与相对湿度估算的 STC/TiN‑gel@LiCl 日产水量。2024–2025 年全球年均温湿度数据取自 NASA POWER(全球能源资源预测)数据访问查看器(https://power.larc.nasa.gov/data-access-viewer/),并以 0.5°×0.5° 的空间分辨率处理得到全球年均值。(f) 收集水样中的离子浓度检测结果。

原文链接:

https://doi.org/10.1002/adma.73291

注:仅代表小编个人观点,侵权请联系!

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  1. CONNECT:[ UseTime:0.000959s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001495s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000730s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000858s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001582s ]
  6. SELECT * FROM `set` [ RunTime:0.000656s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001362s ]
  8. SELECT * FROM `article` WHERE `id` = 586297 LIMIT 1 [ RunTime:0.000989s ]
  9. UPDATE `article` SET `lasttime` = 1778279711 WHERE `id` = 586297 [ RunTime:0.025740s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000769s ]
  11. SELECT * FROM `article` WHERE `id` < 586297 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001338s ]
  12. SELECT * FROM `article` WHERE `id` > 586297 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004462s ]
  13. SELECT * FROM `article` WHERE `id` < 586297 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004499s ]
  14. SELECT * FROM `article` WHERE `id` < 586297 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003754s ]
  15. SELECT * FROM `article` WHERE `id` < 586297 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001961s ]
0.237841s