Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, Heilongjiang 150025, China.
Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, Heilongjiang 150025, China; Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, Heilongjiang 150025, China.
J Colloid Interface Sci. 2022 Feb;607(Pt 2):1446-1456. doi: 10.1016/j.jcis.2021.09.074. Epub 2021 Sep 16.
Solar-driven interface water evaporation is a promising strategy for desalination and wastewater treatment. However, it remains a huge challenge to simultaneously achieve a high light-to-heat conversion efficiency (η) and multi-media evaporation applications. In this study, a highly efficient Janus hydrogel photothermal film was developed using yolk-like non-stoichiometric nickel sulfide (NiS) microspheres and agar hydrogel. The NiS immobilized in the agar hydrogel has full-spectrum absorption characteristics at 200-2500 nm, which can perform efficient light-to-heat conversion and regulate water transport channels. Additionally, the pure agar in the bottom can transport water effectively and avoid heat loss. By the pouring method, the Janus hydrogel film can be easily prepared into various shapes; hence, it can be adjusted depending on the environment in which it is used. The optimized Janus hydrogel film (Janus hydrogel-1) possessed good hydrophilicity and showed an excellent solar evaporation rate of 1.45 kg mh, and a high η of 97% under one-sun irradiation. Theoretical simulation results showed that the outstanding water evaporation performance of Janus hydrogel-1 was mainly due to its relatively free water transport channels. Janus hydrogel-1 can be used for water evaporation applications in various media, including seawater, heavy metal ion/organic wastewater, and domestic sewage. Our work highlights the great potential of Janus hydrogel-1 for realizing a highly effective solar energy-driven interface water evaporation and multi-media purification.
太阳能驱动界面蒸发是海水淡化和废水处理的一种很有前途的策略。然而，同时实现高光热转换效率（η）和多介质蒸发应用仍然是一个巨大的挑战。在这项研究中，使用蛋黄型非化学计量硫化镍（NiS）微球和琼脂水凝胶开发了一种高效的 Janus 水凝胶光热膜。固定在琼脂水凝胶中的 NiS 在 200-2500nm 范围内具有全光谱吸收特性，可进行高效的光热转换并调节水传输通道。此外，底部的纯琼脂可以有效地输送水并避免热量损失。通过浇注法，Janus 水凝胶膜可以很容易地制备成各种形状；因此，可以根据使用环境进行调整。优化的 Janus 水凝胶膜（Janus hydrogel-1）具有良好的亲水性，在单阳光照射下表现出 1.45kg·mh 的出色太阳能蒸发率和 97%的高 η。理论模拟结果表明，Janus hydrogel-1 出色的水蒸发性能主要归因于其相对自由的水传输通道。Janus hydrogel-1 可用于各种介质的水蒸发应用，包括海水、重金属离子/有机废水和生活污水。我们的工作突出了 Janus hydrogel-1 在实现高效太阳能驱动界面水蒸发和多介质净化方面的巨大潜力。
