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Flexible Photothermal Membrane Based on PVA/Carbon Dot Hydrogel Films for High-Performance Interfacial Solar Evaporation
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2024-05-17 , DOI: 10.1021/acsapm.4c00996 Indriyati 1, 2 , Dinda Fahrila Suci Ramadhani 1 , Fitri Aulia Permatasari 1, 3, 4 , Muhammad Miftahul Munir 1 , Muhamad Nasir 5 , Ferry Iskandar 1, 3, 4
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2024-05-17 , DOI: 10.1021/acsapm.4c00996 Indriyati 1, 2 , Dinda Fahrila Suci Ramadhani 1 , Fitri Aulia Permatasari 1, 3, 4 , Muhammad Miftahul Munir 1 , Muhamad Nasir 5 , Ferry Iskandar 1, 3, 4
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Interfacial solar-driven water evaporation (SWE) is gaining attention as a promising solution to address the urgent global water shortage. However, developing materials that are simultaneously flexible, durable, cost-effective, and easy to prepare while maintaining high light absorption and performance remains a significant challenge. In response, this study introduces an approach using a hydrogel film based on poly(vinyl alcohol) (PVA) integrated with carbon dots (CDs) to leverage their photothermal effect. The preparation method involves mixing and solution casting processes with the addition of citric acid as the green cross-linker, followed by heat treatment. As a result, the swollen PVA/CD hydrogel film exhibits a breaking stress of 9 MPa and an elongation at the break of 247%. Moreover, the hydrophilic nature of PVA ensures efficient water transportation and supply, leading to a remarkable evaporation rate of 1.58 kg m–2 h–1, 6.1 times higher than that of pure water without hydrogel (0.26 kg m–2 h–1), both under 1 sun illumination. Additionally, it demonstrates remarkable stability, maintaining consistent evaporation rates over several cycles, thus indicating its long-term durability and potential for reuse. This study presents a facile yet effective approach to advancing hydrogel films for solar evaporation, offering a promising solution to address water scarcity.
中文翻译：
基于PVA/碳点水凝胶薄膜的柔性光热膜，用于高性能界面太阳能蒸发
界面太阳能驱动水蒸发（SWE）作为解决全球紧迫水资源短缺的一种有前途的解决方案而受到关注。然而，开发同时具有柔性、耐用、经济高效且易于制备的材料，同时保持高光吸收和性能仍然是一个重大挑战。为此，本研究介绍了一种使用基于聚乙烯醇（PVA）的水凝胶薄膜与碳点（CD）集成的方法来利用其光热效应。其制备方法包括混合和溶液浇铸过程，添加柠檬酸作为绿色交联剂，然后进行热处理。结果，溶胀的PVA/CD水凝胶膜表现出9 MPa的断裂应力和247%的断裂伸长率。此外，PVA的亲水性保证了水分的高效输送和供应，蒸发速率高达1.58 kg m –2 h –1 ，比不含水凝胶的纯水高6.1倍（0.26 kg m –2 h –1 ），均在 1 个太阳光照下。此外，它还表现出卓越的稳定性，在多个循环中保持一致的蒸发速率，从而表明其长期耐用性和重复使用的潜力。这项研究提出了一种简便而有效的方法来推进用于太阳能蒸发的水凝胶薄膜，为解决水资源短缺问题提供了一种有前途的解决方案。
更新日期：2024-05-17
中文翻译：
基于PVA/碳点水凝胶薄膜的柔性光热膜，用于高性能界面太阳能蒸发
界面太阳能驱动水蒸发（SWE）作为解决全球紧迫水资源短缺的一种有前途的解决方案而受到关注。然而，开发同时具有柔性、耐用、经济高效且易于制备的材料，同时保持高光吸收和性能仍然是一个重大挑战。为此，本研究介绍了一种使用基于聚乙烯醇（PVA）的水凝胶薄膜与碳点（CD）集成的方法来利用其光热效应。其制备方法包括混合和溶液浇铸过程，添加柠檬酸作为绿色交联剂，然后进行热处理。结果，溶胀的PVA/CD水凝胶膜表现出9 MPa的断裂应力和247%的断裂伸长率。此外，PVA的亲水性保证了水分的高效输送和供应，蒸发速率高达1.58 kg m –2 h –1 ，比不含水凝胶的纯水高6.1倍（0.26 kg m –2 h –1 ），均在 1 个太阳光照下。此外，它还表现出卓越的稳定性，在多个循环中保持一致的蒸发速率，从而表明其长期耐用性和重复使用的潜力。这项研究提出了一种简便而有效的方法来推进用于太阳能蒸发的水凝胶薄膜，为解决水资源短缺问题提供了一种有前途的解决方案。
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