生物质复合吸湿材料的制备及其空气捕水性能

Preparation of Biomass Composite Hygroscopic Materials and Its Atmospheric Water Harvesting Performance

以油菜花粉(PC)和天然轻木(W)为基底,通过原位聚合和浸渍法在分级空心结构花粉表面原位生长聚吡咯光吸收剂,并负载到LiCl填充的轻木表面,得到LiCl@PC-W-PPy复合吸湿材料,用于空气捕水。通过SEM、FTIR和UV-vis-NIR对材料微观结构和光热性能进行表征和分析,对LiCl@PC-W-PPy进行吸附动力学和热力学研究,在户外验证了空气捕水的可行性。结果表明:LiCl@PC-W-PPy在25℃和60%RH时吸湿量可达1.68 kg/m^(2),户外测试最大产水量可达4.94 kg/m^(2)。此外,LiCl@PC-W-PPy在10次循环过程中吸脱附性能无明显变化,表明材料具有较好的稳定性。

Using rape pollen(PC) and natural balsa wood(W) as substrates, the polypyrrole light absorber was grown on the pollen surface of a graded hollow structure by in-situ polymerization and impregnation methods, and loaded onto the surface of LiCl-filled balsa wood to obtain the LiCl@PC-W-PPy composite hygroscopic materials for atmospheric water harvesting. The microstructure and photothermal properties of the material were characterized and analyzed by SEM, FTIR, and UV-vis-NIR, and the adsorption kinetics and thermodynamics of the LiCl@PC-W-PPy were studied to verify the feasibility of atmospheric water harvesting outdoors. The results showed that the LiCl@PC-W-PPy could absorb vapor up to 1.68kg/m^(2) at 25 ℃ and 60% RH, and the maximum water production could reach 4.94 kg/m^(2) at outdoor tests. In addition, the adsorption and desorption properties of the LiCl@PC-W-PPy did not change significantly during 10 cycles, indicating that the material has good stability.