School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, China.
School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, China.
J Colloid Interface Sci. 2023 Oct;647:344-353. doi: 10.1016/j.jcis.2023.05.105. Epub 2023 May 19.
The field of solar vapor generation has developed rapidly in recent years, but achieving the goals of a high evaporation rate, eco-friendliness and rapid preparation with low-cost raw materials is still a challenge. In this work, a type of photothermal hydrogel evaporator was prepared by blending eco-friendly poly(vinyl alcohol), agarose, Fe and tannic acid (TA) together, in which the tannic acid-ferric ion (TAFe) complexes served as photothermal materials and effective gelators. The results indicate that the TAFe complex exhibits excellent gelatinization ability and light-absorption performance, which leads to a compressive stress of 0.98 MPa at 80% strain and up to 85% light absorption ratio in the photothermal hydrogel. For interfacial evaporation, a high rate of 1.897 ± 0.11 kg·m·h corresponding to an energy efficiency of 89.7 ± 2.73% under 1 sun irradiation is achieved. Moreover, the hydrogel evaporator exhibits high stability in a 12-hour test and a 20-cycle test without a decline in evaporation performance. The outdoor testing results show that the hydrogel evaporator can achieve an evaporation rate of > 0.70 kg/m and effectively purify wastewater treatment and seawater desalination.
近年来，太阳能蒸汽发生领域发展迅速，但要实现高蒸发率、环保、快速制备和低成本原料的目标仍然是一个挑战。在这项工作中，通过将环保的聚乙烯醇、琼脂、Fe 和单宁酸（TA）混合在一起，制备了一种光热水凝胶蒸发器，其中 TAFe 配合物作为光热材料和有效的凝胶剂。结果表明，TAFe 配合物具有优异的胶凝能力和光吸收性能，在光热水凝胶中产生 0.98 MPa 的压缩应力和高达 85%的光吸收率。对于界面蒸发，在 1 个太阳照射下，实现了 1.897 ± 0.11 kg·m·h 的高蒸发率，对应的能量效率为 89.7 ± 2.73%。此外，水凝胶蒸发器在 12 小时测试和 20 次循环测试中表现出高稳定性，蒸发性能没有下降。户外测试结果表明，水凝胶蒸发器的蒸发率>0.70 kg/m，可以有效进行废水处理和海水淡化。
