Recyclable and efficient ocean biomass-derived hydrogel photothermal evaporator for thermally-localized solar desalination

Tian, Yanpei; Liu, Xiaojie; Xu, Shilin; Li, Jiansheng; Caratenuto, Andrew; Mu, Ying; Wang, Ziqi; Chen, Fangqi; Yang, R.; Li, Jun; Minus, Marilyn L.; Zheng, Yi

doi:10.1016/j.desal.2021.115449

Cited by 57 publications

(23 citation statements)

References 44 publications

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“…Specifically, the hydrogel-based SVGs that focused on water management (blue pentagons) mostly have higher evaporation rates than those that focused on thermal management (orange diamonds). For example, the SVG point A presented 57 used the unidirectional freezing method to construct vertically rapid water transport channels, and it has a much higher evaporation rate than other gels mainly focused on thermal management. Moreover, instead of using complex fabrication methods ( i.e.…”

Section: Resultsmentioning

confidence: 99%

A cryogel solar vapor generator with rapid water replenishment and high intermediate water content for seawater desalination

et al. 2023

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Section: Resultsmentioning

confidence: 99%

A cryogel solar vapor generator with rapid water replenishment and high intermediate water content for seawater desalination

et al. 2023

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“…78 Driven by the chemical potential difference between water and membrane surface, the dissolved salt was refluxed passively along the water channel through diffusion. 77,79 This ability to automatically complete salt crystal removal without external force contributes to the long-term operation of the system and makes it applicable to practical applications. 80 3.5.…”

Section: Resultsmentioning

confidence: 99%

“…The surface morphology of the lamellar films did not change significantly (Figure S14c). From the thermodynamic point of view, the migration of crystalline salt to seawater is a spontaneous process driven by the chemical potential of different salt concentrations. , Under lights-out conditions, the evaporation of water slowed down, and the salt crystals were dissolved by unsaturated water in the pores . Driven by the chemical potential difference between water and membrane surface, the dissolved salt was refluxed passively along the water channel through diffusion. , This ability to automatically complete salt crystal removal without external force contributes to the long-term operation of the system and makes it applicable to practical applications …”

Section: Resultsmentioning

confidence: 99%

“…From the thermodynamic point of view, the migration of crystalline salt to seawater is a spontaneous process driven by the chemical potential of different salt concentrations. , Under lights-out conditions, the evaporation of water slowed down, and the salt crystals were dissolved by unsaturated water in the pores . Driven by the chemical potential difference between water and membrane surface, the dissolved salt was refluxed passively along the water channel through diffusion. , This ability to automatically complete salt crystal removal without external force contributes to the long-term operation of the system and makes it applicable to practical applications …”

Section: Resultsmentioning

confidence: 99%

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High-Porosity Lamellar Films Prepared by a Multistage Assembly Strategy for Efficient Photothermal Water Evaporation and Power Generation

Huang

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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The frame structure combined with water-and heattransfer capabilities fully satisfies the requirements of photothermal conversion materials in seawater evaporation applications. Meanwhile, it must integrate the characteristics of a high photothermal conversion rate, thermal management, and water transportation. Herein, lamellar porous films were successfully designed and synthesized by a simple ultrasonic-assisted vacuum filtration method. In this process, polystyrene sulfonate@carbon nanotubes/reduced graphene oxide (PSS@CNT/rGO) lamellar films were constructed by the one-dimensional synthesis of PSS@CNT self-assembled at the molecular scale and the two-dimensional matrix material rGO. It is worth noting that the lamellar film exhibits a high specific surface area (285.5 m 2 •g −1 ), which is reflected in its abundant nanopores. Among them, the porous network system composed of nanochannels can provide efficient water supply and steam-transfer ability and strengthen the heat insulation performance of thermal localization, which is beneficial to photothermal evaporation. The obtained PSS@CNT/rGO lamellar films achieved a condensed water yield of 1.825 kg•m −2 •h −1 under 1 sun illumination (1 kW•m −2 ), and their solar-vapor conversion efficiency was 97.1%. Simultaneously, the interaction between the water flow and the carbon material interface was also used to generate additional electric energy output. The maximum open-circuit voltage of 0.46 V was generated at both termini of the PSS@ CNT/rGO lamellar film, which successfully realized the multieffect utilization of energy. These results show that the multistage assembly strategy is a facile and effective means for the development of an efficient evaporation photothermal film, which offers significant value in the field of photothermal seawater evaporation and power generation.

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“…[40][41][42] In addition, the freezing directions and ice sizes can be accordingly adjusted by designing the temperature field. [43,44] With these features, icetemplating technology, which is transcribing ice crystals structure into artificial materials, has been applied to a wide range of fields, including biomedical, [45][46][47] structural, [48][49][50] electrical, [51][52][53] and thermal applications, [54] energy storage and conversion, [55][56][57] and environmental remediation. [58][59][60] Moreover, functional nanomaterials are easily integrated into the ice-templated bulk.…”

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confidence: 99%

Freezing as a Path to Build Micro‐Nanostructured Icephobic Coatings

Miao

Liu

Chen

2022

Adv Funct Materials

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Superhydrophobic photothermal materials with the micro‐nano structure are considered to be promising icephobic surfaces. Unfortunately, converting micro‐nano hierarchical structure concepts into genuine synthetic materials has proven to be exceedingly expensive and difficult, partially because their sophisticated structures need construction at several length scales. Herein, a facile strategy of employing ice crystals to construct sophisticated hierarchical micro‐nanostructured anti‐icing composites with photothermal, self‐healable, and self‐cleaning properties is presented. The composites are covered with interconnected microscale pores replicated from ice crystals, which facilitates the construction of the hydrophobic or superhydrophobic properties based on the Cassie–Baxter model, endowing the coating with self‐cleaning ability. Besides, by adding solar‐to‐heat conversation nanomaterials, the coating can implement in situ solar anti‐/deicing. The abundant micropores caused by ice templates can further improve the photothermal conversion capability through multiple reflections of light. Importantly, the coating is endowed with the self‐healing capability to repair hydrophobicity under sunlight. Additionally, it is demonstrated that the self‐cleaning and self‐healing abilities are mutually reinforcing, synergistically improving anti‐/deicing performances. Overall, the presented ice‐templated coating shows great potential and broad impacts owing to its inexpensive component materials, simplicity, eco‐friendliness, and high energy efficiency.

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Recyclable and efficient ocean biomass-derived hydrogel photothermal evaporator for thermally-localized solar desalination

Cited by 57 publications

References 44 publications

A cryogel solar vapor generator with rapid water replenishment and high intermediate water content for seawater desalination

A cryogel solar vapor generator with rapid water replenishment and high intermediate water content for seawater desalination

High-Porosity Lamellar Films Prepared by a Multistage Assembly Strategy for Efficient Photothermal Water Evaporation and Power Generation

Freezing as a Path to Build Micro‐Nanostructured Icephobic Coatings

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