Flexible Salt-Rejecting Photothermal Paper Based on Reduced Graphene Oxide and Hydroxyapatite Nanowires for High-Efficiency Solar Energy-Driven Vapor Generation and Stable Desalination
Flexible Salt-Rejecting Photothermal Paper Based on Reduced Graphene Oxide and Hydroxyapatite Nanowires for High-Efficiency Solar Energy-Driven Vapor Generation and Stable Desalination
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基于还原氧化石墨烯和羟基磷灰石纳米线的柔性脱盐光热纸，用于高效太阳能驱动的蒸汽产生和稳定的海水淡化
DOI：
10.1021/acsami.0c05986
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发表时间：
2020
影响因子：
9.5
通讯作者：
Yang Ri-Long
中科院分区：
文献类型：
--
作者：
Xiong Zhi-Chao;Zhu Ying-Jie;Qin Dong-Dong;Yang Ri-Long
太阳能水蒸气发电作为一种高效的污水净化和海水淡化技术，正在成为缓解全球水危机的有效手段。然而，蒸发表面的盐分沉积严重影响了蒸发水的长期稳定蒸发性能。在此，我们开发了一种由还原氧化石墨烯(RGO)和超长羟基磷灰石纳米线(HNS)组成的柔性抗盐光热纸，用于高效太阳能驱动的水蒸发和稳定的海水淡化。RGO/HN光热纸具有层次化的多孔结构、通道互连、机械强度高、太阳光吸收和光热转换效率高、水分传输快、隔热和抗盐性能好等优点。此外，rGO/HN光热纸的亲水性和疏水性可以通过调节热处理时间来调节。亲水性RGO/HN光热纸在1kW m-2光照下的水分蒸发速率为1.48 kg m-2·h-1，能效为89.2%。疏水性RGO/HN光热纸在海水淡化过程中表现出长期稳定的水分蒸发和抗盐性能。柔性抗盐光热纸RGO/HN可以从废水和海水中产生清洁的水，对有机染料、金属离子和盐离子具有很高的截留率，在净水和海水淡化方面具有广阔的应用前景。
Vapor generation using solar energy is emerging as an efficient technology for wastewater purification and seawater desalination to relieve global water crisis. However, salt deposition on the evaporation surface seriously impairs the long-term steady water evaporation performance. Herein, the flexible salt-rejecting photothermal paper comprising reduced graphene oxide (rGO) and ultralong hydroxyapatite nanowires (HNs) has been developed for high-performance solar energy-driven water evaporation and stable desalination of seawater. The rGO/HN photothermal paper has advantages such as the hierarchical porous structure, interconnected channels, high mechanical strength, high efficiencies of solar light absorption and photothermal conversion, fast water transportation, and good heat insulation and salt-rejecting properties. Furthermore, the hydrophilicity and hydrophobicity of the rGO/HN photothermal paper can be adjusted by regulating the thermal treatment time. The water evaporation rate and energy efficiency of the hydrophilic rGO/HN photothermal paper are 1.48 kg m–2h–1and 89.2%, respectively, under 1 sun illumination (1 kW m–2). The hydrophobic rGO/HN photothermal paper shows a long-time stable water evaporation and salt-rejecting performance in the process of seawater desalination. The flexible salt-rejecting rGO/HN photothermal paper can produce clean water from wastewater and seawater with high rejection rates of organic dyes, metal ions, and salt ions, and it is promising for applications in water purification and seawater desalination.