Hydrophilic polymer-stabilized porous composite membrane for water evaporation and solar desalination

Han, Xiaoning; Zang, Linlin; Zhang, Shaochun; Dou, Tianwei; Li, Liang; Yang, Jian; Sun, Laijun; Zhang, Yanhong; Wang, Cheng

doi:10.1039/c9ra09667a

Cited by 29 publications

(15 citation statements)

References 29 publications

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“…For example, as previously mentioned, Liu et al 27 achieved 83% of efficiency at 12 suns of illumination for their bi‐layered structure of graphene oxide/radially cut wood. Also Han et al 43 achieved an evaporation rate of 1.62 kg m −2 h −1 under similar lighting conditions, but the energy conversion efficiency was only 87% for the SWE consisting of a hydrophilic photothermal layer composed of poly(methacrylic acid) with three‐dimensional porous carbon nanotube beads on a glass microfiber membrane as substrate. Xue et al 44 used a flame‐treatment over natural wood to locate the solar heating on the evaporation surface, achieving a thermal efficiency of 72% at 1 kW m −2 of light intensity.…”

Section: Resultsmentioning

confidence: 99%

Interfacial photothermal water evaporator based on nanoporous microwave‐expanded graphite and coconut waste fibers@recycled polystyrene as substrate

et al. 2020

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Solar water evaporators (SWE) have shown growing interest due to their capacity to transform sunlight to thermal energy. In this work, SWE were prepared based on microwave-expanded graphite as light absorber deposited onto an ecological porous substrate obtained by casting a mixture of coconut fibers and recycled polystyrene. The materials were characterized by SEM, FTIR and UV/Vis-NIR spectroscopies, and thermogravimetric analyses. It was observed that the light absorber film presented high and wide light absorption in the solar electromagnetic spectrum and increased superficial area when compared to the unexpanded graphite film counterpart. Nanopores between 400 and 900 nm and microcavities in the 200 to 500 μm range were formed at the surface of the SWE after 6 seconds of microwave exposure, which are destroyed at higher exposure times. SWE of laboratory scale diameter were tested for water evaporation at different light intensities, microwave expanding time, and thicknesses to determine their effects on evaporation rate and efficiency. It was observed that SWE rates increased from 1.09 ± 0.006 to 1.73 ± 0.007 kg h −1 m −2 for unexpanded and expanded graphite through 6 seconds, respectively; being the latter the best SWE reaching 91.5% of efficiency at 1200 W m −2 of illumination. This efficiency was stable after reaching the maximum stable efficiency in only 15 minutes. The scaling-up of the process was studied in a SWE of 6.1 cm in diameter using a bigger glass cell in the presence of pure water or simulated seawater (3.5% NaCl), achieving efficiencies of 89.8% and 86.1%, respectively.

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Section: Resultsmentioning

confidence: 99%

Interfacial photothermal water evaporator based on nanoporous microwave‐expanded graphite and coconut waste fibers@recycled polystyrene as substrate

et al. 2020

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“… 41 Moreover, the abundant pores of CuO can confine the light in the composite and Ag NPs enhanced the solar absorbitivy. 42 In this study, we fabricated a floating solar steam generation device involving a bottom thermal insulation stand (polyurethane foam, PU), and a top photothermal composite sprayed onto the filter paper substrate by a simple method. The brine was transferred to the surface through the stand wicks and the filter paper channels.…”

Section: Introductionmentioning

confidence: 99%

High efficiency solar desalination and dye retention of plasmonic/reduced graphene oxide based copper oxide nanocomposites

et al. 2021

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“…Effective freshwater production efficiency can be defined as how much solar light is utilized and converted into vapor generation. The solar-to-vapor conversion efficiency (η) is the key parameter to determine the desalination process, which can be estimated by the following expression [42],…”

Section: Solar-to-vapor Conversion Efficiency (η)mentioning

confidence: 99%

Advancements in Solar Desalination of Seawater by Various Ti3C2 MXene Based Morphologies for Freshwater Generation: A Review

Sreedhar

Noh

2021

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For a few years, we have been witnessing ubiquitous fresh and drinking water scarcity in various countries. To mitigate these problematic situations, many countries relied on non-conventional freshwater generation technologies through solar desalination of seawater. In this manner, we excel the ability of new class 2D Ti3C2 MXenes as a photothermal material (solar absorber) for freshwater generation via the solar desalination technique. In this review, the air–water interfacial interaction is highlighted for improving the evaporation efficiency. To provide the dependence of the desalination efficiency on the microstructure of the solar absorbers, we summarized various forms of 2D Ti3C2 MXenes (aerosol, films, foam, hydrogel, membrane, monolith and porous structure) and their characteristics. These microstructures prevailed ultrahigh photoconversion efficiency. In this aspect, we further explained key features such as light absorption, reflection, multiple internal reflection, hydrophilicity, lower thermal conduction, light-to-heat generation, and salt rejection for achieving efficient desalination output throughout the visible and broadband region. Specifically, we targeted to explore the self-floating and salt rejection nature of various state-of-the-art 2D Ti3C2 MXene structures. Further, we highlighted the long-term stability. Among the above morphologies, Ti3C2 MXene in the form of a membrane is believed to be a promising morphology which effectively desalinates seawater into freshwater. Finally, we highlighted the challenges and future perspectives, which can pave a potential path for advancing the sustainable solar desalination of seawater into freshwater.

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Hydrophilic polymer-stabilized porous composite membrane for water evaporation and solar desalination

Abstract: A polymer-stabilized interfacial evaporator was designed with a porous structure, and exhibited excellent water evaporation and solar desalination performance.

Cited by 29 publications

References 29 publications

Interfacial photothermal water evaporator based on nanoporous microwave‐expanded graphite and coconut waste fibers@recycled polystyrene as substrate

Interfacial photothermal water evaporator based on nanoporous microwave‐expanded graphite and coconut waste fibers@recycled polystyrene as substrate

High efficiency solar desalination and dye retention of plasmonic/reduced graphene oxide based copper oxide nanocomposites

Advancements in Solar Desalination of Seawater by Various Ti3C2 MXene Based Morphologies for Freshwater Generation: A Review

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