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Unique Photothermal Materials for Cutting-Edge Interfacial Solar Desalination and Wastewater Purification
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Harnessing renewable solar energy for solar desalination shows great promise for addressing freshwater scarcity. However, conventional solar desalination suffers from low photothermal conversion and excessive heat dissipation, limiting its practicality for meeting water demand. Interfacial solar steam generation (ISSG) has emerged to address these limitations, leveraging advances in photothermal absorber materials, structural design, and thermal management. The photothermal material (PTM) plays a crucial role as it facilitates the conversion of solar energy into localized heat energy, leading to water evaporation within a localized high-temperature zone.1 In this talk, we present unique photothermal absorber materials that are not common for ISSG, such as bismuth copper oxysulfide (BiCuSO; BCSO), silicon (Si), and red phosphorus (RP), exhibiting broad light absorption, low thermal conductivity, and high heat localization. 2–5 We employed a mechanochemical activation method to regulate particle size and surface defects simultaneously, thus enhancing the optical, thermal, and photothermal properties. Utilizing the 1D water path architecture, we achieved an outstanding water evaporation rate of 2.2 (photothermal efficiency: 107.9%), 1.77 (96%), and 1.75 kg/m2·h (94.0%) using Si, BCSO, and RP absorber materials, respectively, under 1 sun illumination (100 mW/cm2). Furthermore, our photothermal absorbers demonstrated excellent ion rejection capabilities when subjected to continuous measurement for 50 h with both seawater and industrial wastewater. The emerging interface solar-driven steam generation technology promises to meet future human needs for freshwater, energy, and environmental sustainability.
Keywords: Photothermal materials; Mechanochemical activation; Defect control; Interfacial solar desalination; Wastewater purification.
References:
1 X. Cui, Q. Ruan, X. Zhuo, X. Xia, J. Hu, R. Fu, Y. Li, J. Wang and H. Xu, Chem. Rev., 2023, 123, 6891–6952.
2 T. S. Shridharan, M. J. Kang, A. Sivanantham, S. Kim and I. S. Cho, Desalination, 2022, 540, 115984.
3 T. S. Shridharan, A. Sivanantham, R. Tan, S. Y. Hong, D. H. Kim and I. S. Cho, Desalination, 2023, 561, 116700.
4 T. S. Shridharan, A. Sivanantham, J. H. Lee, S. Y. Hong, Y. J. Jeong, S. S. Shin and I. S. Cho, Chem. Eng. J., 2024, 486, 150247.
5 T. S. Shridharan, J. H. Lee, R. Tan, A. Sivanantham, H. S. Han, H. S. Jung and I. S. Cho, Desalination, 2024, 579, 117464.
Figure 1
The Electrochemical Society
Title: Unique Photothermal Materials for Cutting-Edge Interfacial Solar Desalination and Wastewater Purification
Description:
Harnessing renewable solar energy for solar desalination shows great promise for addressing freshwater scarcity.
However, conventional solar desalination suffers from low photothermal conversion and excessive heat dissipation, limiting its practicality for meeting water demand.
Interfacial solar steam generation (ISSG) has emerged to address these limitations, leveraging advances in photothermal absorber materials, structural design, and thermal management.
The photothermal material (PTM) plays a crucial role as it facilitates the conversion of solar energy into localized heat energy, leading to water evaporation within a localized high-temperature zone.
1 In this talk, we present unique photothermal absorber materials that are not common for ISSG, such as bismuth copper oxysulfide (BiCuSO; BCSO), silicon (Si), and red phosphorus (RP), exhibiting broad light absorption, low thermal conductivity, and high heat localization.
2–5 We employed a mechanochemical activation method to regulate particle size and surface defects simultaneously, thus enhancing the optical, thermal, and photothermal properties.
Utilizing the 1D water path architecture, we achieved an outstanding water evaporation rate of 2.
2 (photothermal efficiency: 107.
9%), 1.
77 (96%), and 1.
75 kg/m2·h (94.
0%) using Si, BCSO, and RP absorber materials, respectively, under 1 sun illumination (100 mW/cm2).
Furthermore, our photothermal absorbers demonstrated excellent ion rejection capabilities when subjected to continuous measurement for 50 h with both seawater and industrial wastewater.
The emerging interface solar-driven steam generation technology promises to meet future human needs for freshwater, energy, and environmental sustainability.
Keywords: Photothermal materials; Mechanochemical activation; Defect control; Interfacial solar desalination; Wastewater purification.
References:
1 X.
Cui, Q.
Ruan, X.
Zhuo, X.
Xia, J.
Hu, R.
Fu, Y.
Li, J.
Wang and H.
Xu, Chem.
Rev.
, 2023, 123, 6891–6952.
2 T.
S.
Shridharan, M.
J.
Kang, A.
Sivanantham, S.
Kim and I.
S.
Cho, Desalination, 2022, 540, 115984.
3 T.
S.
Shridharan, A.
Sivanantham, R.
Tan, S.
Y.
Hong, D.
H.
Kim and I.
S.
Cho, Desalination, 2023, 561, 116700.
4 T.
S.
Shridharan, A.
Sivanantham, J.
H.
Lee, S.
Y.
Hong, Y.
J.
Jeong, S.
S.
Shin and I.
S.
Cho, Chem.
Eng.
J.
, 2024, 486, 150247.
5 T.
S.
Shridharan, J.
H.
Lee, R.
Tan, A.
Sivanantham, H.
S.
Han, H.
S.
Jung and I.
S.
Cho, Desalination, 2024, 579, 117464.
Figure 1.
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