Abstract
Solar-driven steam generation is considered an energy-saving and environmentally friendly thermal distillation method to solve freshwater shortage through desalination and wastewater treatment. Herein, PPy-doped cellulose composite hydrogels (PCGs) are prepared for clean water production. By varying the matrix solid content, the pore structure and water transport ability of the hydrogel material can be tailored, and the water evaporation enthalpy can be reduced by creating weak hydrogen bonds. By balancing hydrophobic sites in the hydrogel, porosity induced water transport and reduced evaporation enthalpy, a water evaporation rate of 1.88 kg m−2 h−1 under one sun is obtained. Furthermore, the specific surface area and hydrophilic groups of the three-dimensional hydrogel provide adsorption sites, and the removal of methyl blue (MB) organic dye is as high as 99%. The combination of water evaporation and cleaning capabilities provide a framework for the exploration of the next generation of evaporators for wastewater treatment applications.
Graphical Abstract
Highlights
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Cellulose composite hydrogel with in-situ polymerized polypyrrole are fabricated.
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The water transport and evaporation enthalpy are balanced for water evaporation.
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The hydrogels are unaffected by salt concentrations up to 20%.
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The hydrogels are suitable for dye waste water cleaning.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (No. 2016YFB 0303000) and the New Materials Research Key Program of Tianjin (No. 16ZXCLGX00090).
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Wang, R., Wang, W., Jensen, M. et al. Polypyrrole-doped cellulose hydrogel evaporator for steam generation and wastewater cleaning. J Sol-Gel Sci Technol 107, 363–374 (2023). https://doi.org/10.1007/s10971-023-06128-4
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DOI: https://doi.org/10.1007/s10971-023-06128-4