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Ionic Dye Based Covalent Organic Frameworks for Photothermal Water Evaporation
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-05-08 , DOI: 10.1002/adfm.202213810 Guoqing Li 1 , Qihong Yue 1 , Ping Fu 1 , Ke Wang 1 , Yu Zhou 1 , Jun Wang 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-05-08 , DOI: 10.1002/adfm.202213810 Guoqing Li 1 , Qihong Yue 1 , Ping Fu 1 , Ke Wang 1 , Yu Zhou 1 , Jun Wang 1
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Conversion of solar energy into heat for water evaporation is of great significance to provide clean and sustainable technology for water purification by using inexhaustible sunlight. In this field, one of the challenges comes from the design of high-performance photothermal materials powerful in light harvesting, light-to-heat conversion, and water activation. Herein, it is demonstrated that rationalization of the ionic covalent organic framework (iCOF) can simultaneously satisfy these multiple requirements and a new iCOF STTP is constructed through the Schiff base chemistry in a rapid microwave-assisted solvothermal route by using a hydrophilic dye molecule safranineT as the ionic building block. The integrated dye-related ionic moieties greatly strengthen the light absorbance (>97%) throughout the entire solar spectrum from UV–vis to the infrared region. The framework ionic moieties provide strong polarization to reduce the exciton dissociation energy for enhanced photothermal effect, and in addition, promote sufficient water activation to decrease the water evaporation enthalpy. As an outcome, the STTP driven solar water evaporator affords a fast water evaporation rate of 3.55 kg h−1 m−2 and high solar-to-vapor efficiency of 95.8%. This study highlights the potential of designing iCOF materials for photothermal applications.
中文翻译：
用于光热水蒸发的离子染料基共价有机框架
将太阳能转化为热量用于水蒸发对于利用取之不尽用之不竭的阳光净化水提供清洁和可持续的技术具有重要意义。在这一领域，挑战之一来自于设计具有光捕获、光热转换和水活化功能的高性能光热材料。在此，证明了离子共价有机骨架（iCOF）的合理化可以同时满足这些多重要求，并且是一种新的iCOF 。COF STTP 是通过席夫碱化学通过快速微波辅助溶剂热途径构建的，使用亲水性染料分子番红 T 作为离子构件。集成的染料相关离子部分极大地增强了从紫外可见光到红外区域的整个太阳光谱的光吸收率 (>97%)。骨架离子部分提供强极化以降低激子解离能以增强光热效应，此外，促进充分的水活化以降低水蒸发热。结果，STTP驱动的太阳能水蒸发器提供了3.55 kg h -1 m -2的快速水蒸发速率和95.8%的高太阳能蒸汽效率。这项研究凸显了设计i的潜力用于光热应用的 COF 材料。
更新日期：2023-05-08
中文翻译：
用于光热水蒸发的离子染料基共价有机框架
将太阳能转化为热量用于水蒸发对于利用取之不尽用之不竭的阳光净化水提供清洁和可持续的技术具有重要意义。在这一领域，挑战之一来自于设计具有光捕获、光热转换和水活化功能的高性能光热材料。在此，证明了离子共价有机骨架（iCOF）的合理化可以同时满足这些多重要求，并且是一种新的iCOF 。COF STTP 是通过席夫碱化学通过快速微波辅助溶剂热途径构建的，使用亲水性染料分子番红 T 作为离子构件。集成的染料相关离子部分极大地增强了从紫外可见光到红外区域的整个太阳光谱的光吸收率 (>97%)。骨架离子部分提供强极化以降低激子解离能以增强光热效应，此外，促进充分的水活化以降低水蒸发热。结果，STTP驱动的太阳能水蒸发器提供了3.55 kg h -1 m -2的快速水蒸发速率和95.8%的高太阳能蒸汽效率。这项研究凸显了设计i的潜力用于光热应用的 COF 材料。
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