Facile preparation of a robust porous photothermal membrane with antibacterial activity for efficient solar-driven interfacial water evaporation

Li, Yaling; Cui, Xuexue; Zhao, Mingyu; Xu, Yunshi; Chen, Leilei; Cao, Zhijuan; Yang, Shuguang; Wang, Yi

doi:10.1039/c8ta09223k

Cited by 84 publications

(36 citation statements)

References 39 publications

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“…Solar-driven evaporation for clean water production is currently considered as an effective solution to alleviate water shortage because of the ecofriendly and inexhaustible solar energy [1,2]. Self-floating evaporators with a highly efficient energy conversion and fresh water production have attracted intensive attention in the solar desalination technology due to their strong localization effect on heat conduction at air/water interface [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Janus Poly(Vinylidene Fluoride) Membranes with Penetrative Pores for Photothermal Desalination

Yan

Shen

et al. 2020

Research

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Solar-driven desalination has been considered as a promising technology for producing clean water through an abundant and pollution-free energy source. It is a critical challenge to reasonably design the porous morphology and the thermal management of photothermal membranes for enabling efficient energy conversion and water production. In this work, a Janus poly(vinylidene fluoride) membrane was fabricated in combination of penetrative pore structure, asymmetric surface wettability with proper thermal management for high-efficiency solar desalination. Highly open and directly penetrative pores achieved by the two-dimensional solvent freezing strategy are considered to provide direct pathways for water and vapor transportation. The unique feature of hydrophobic upper layer/hydrophilic lower layer enables the photothermal membranes to self-float on the water surface and rapidly pump water from the bulk to the surface. The resulting Janus membrane exhibits a satisfactory light absorbance as high as 97% and a photothermal conversion efficiency of 62.8% under one-sun irradiation in a direct contact mode. The solar-to-vapor efficiency rises up to 90.2% with the assistance of a thermal insulator adopted beneath. Both the Janus membrane and the composite setup are able to work efficiently with a high stability in seawater desalination, and the concentration of ion in condensed water is reduced to below 1 ppm. Therefore, Janus membranes with directly penetrative pores and photothermal surfaces shine a light on the development of high-performance solar evaporators for the practical application in solar seawater desalination.

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Section: Introductionmentioning

confidence: 99%

Janus Poly(Vinylidene Fluoride) Membranes with Penetrative Pores for Photothermal Desalination

Yan

Shen

et al. 2020

Research

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“…Both high temperature carbonization and concentrated acid‐induced dehydration processes were used to produce carbon materials from fallen leaves, the resulting products were designated as fallen‐leaf photothermal film prepared by carbonization (FLPC) and fallen‐leaf photothermal film prepared by dehydration (FLPD), respectively. Then mixed cellulose ester (MCE) with low thermal conductivity (0.565 W m −1 K −1 ) [ 37 ] and hydrophilicity [ 38 ] was utilized as a skeleton material for fabricating the photothermal film. Considering the deposition of carbon materials on MCE by vacuum filtration has a shortage on the mechanical properties, the hydrophilic polyvinyl alcohol (PVA) was coated to improve the mechanical stability and tune the surface wettability.…”

Section: Introductionmentioning

confidence: 99%

Concentrated Acid‐Induced Dehydration of Fallen Leaves for Efficient, Sustainable, and Self‐Cleaning Solar Steam Generation

Shan

Xiong

Sheng

et al. 2020

Adv Energy and Sustain Res

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To develop solar steam generation (SGG) for water treatment, light absorbers have been widely synthesized by carbonization of plants at high temperature. However, the thermal treatment has high energy‐consumption and is environmentally unfriendly. Thus, it is urgent to explore new green approaches to convert biomasses to carbon materials for SSG. Herein, a concentrated acid‐induced dehydration method is developed to convert fallen leaves to carbon powders, fallen‐leaf photothermal film prepared by dehydration (FLPD). The resultant FLPD exhibits a strong absorption covering a wide spectrum. It also contains sufficient oxygen‐containing groups on the surface, leading to low water evaporation enthalpy. To meet the demands of practical applications, the FLPD membrane is modified with polyvinyl alcohol (PVA) to improve the mechanical stabilities and the surface wettability is further enhanced by an oxygen plasma treatment. An SSG device based on the modified membrane attains a competitive evaporation rate of 1.355 kg m−2 h−1 under 1 sun irradiation. The evaporation rate remains approximately constant when evaporating the seawater. Moreover, the salt deposited on the surface could be self‐cleaned due to the high wettability. Therefore, herein, it is demonstrated that concentrated acid‐induced dehydration is an effective and green approach to convert cheap biomasses to carbon materials for SSG applications.

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“…4 Recently, solar-driven interfacial water evaporation, which minimizes thermal dissipation and applies most of the heat to the liquid-vapor phase transition by concentrating heat at the water-air interface, has been developed to improve the evaporation efficiency of water. [5][6][7][8][9][10][11][12][13][14][15][16][17] Generally, most of the reported solar-driven interfacial evaporators comprise three parts [18][19] (Scheme 1a1): 1) a photothermal layer with broadband light absorption and high photothermal conversion, 2) a floatable supporting layer with a low thermal conductivity, and 3) a hydrophilic water channel either on the outside or in the middle of the supporting layer that ensures a continuous water supply to the photothermal layer. Although many highefficiency solar-driven interfacial evaporators have been developed, in practical applications, the photothermal layer or water channel can be damaged by scratching or corrosion, thereby deteriorating the water evaporation efficiency (Scheme 1a2).…”

Section: Introductionmentioning

confidence: 99%

Self-Healing Hydrophilic Porous Photothermal Membranes for Durable and Highly Efficient Solar-Driven Interfacial Water Evaporation

Weng

et al. 2022

CCS Chem

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It is highly desirable to develop a solar-driven interfacial water evaporator with a self-healing ability and highefficiency water evaporation performance for water distillation and desalination, but it is still considerably challenging. Herein, by exploiting the advantages of the self-healing hydrophilic polymer, a self-healing hydrophilic porous photothermal (SHPP) membrane is fabricated by the curing of a mixture of a self-healing hydrophilic polymer, carbon black, and NaCl, followed by the removal of NaCl in water. As the SHPP membrane can simultaneously serve as a photothermal layer and water transportation channel, a solar-driven interfacial evaporator can be readily fabricated by the assembly of the SHPP membrane with a polyethylene foam. The SHPP membrane-based evaporator exhibits a water evaporation rate of 1.68 kg m -2 h -1 and an energy efficiency of 97.3%. These values are superior to those obtained using solar-driven interfacial evaporators with a selfhealing capability. Notably, by reforming hydrogen bonds between fracture surfaces, the SHPP membrane can regain its structural integrity after breaking, making the SHPP membrane-based evaporator the first evaporator that can completely and repeatedly heal water evaporation capacity after physical damage. Herein, the potential of SHPP membranes for developing stable, long-lasting, and high-efficiency solar-driven interfacial water evaporators is highlighted.

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Facile preparation of a robust porous photothermal membrane with antibacterial activity for efficient solar-driven interfacial water evaporation

Abstract: A self-floating photothermal membrane with simultaneous mechanical stability and antibacterial activity is facilely prepared for efficient solar-driven interfacial water evaporation.

Cited by 84 publications

References 39 publications

Janus Poly(Vinylidene Fluoride) Membranes with Penetrative Pores for Photothermal Desalination

Janus Poly(Vinylidene Fluoride) Membranes with Penetrative Pores for Photothermal Desalination

Concentrated Acid‐Induced Dehydration of Fallen Leaves for Efficient, Sustainable, and Self‐Cleaning Solar Steam Generation

Self-Healing Hydrophilic Porous Photothermal Membranes for Durable and Highly Efficient Solar-Driven Interfacial Water Evaporation

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