PEI-GOs/PVA photothermal sponge with enhanced interfacial solar steam generation and seawater desalination

Yang, Zhaohua; Liu, Yuanyuan; Xue, Kaicheng; Fu, Ping; Du, Feipeng; Zhang, Yun‐Fei

doi:10.1016/j.mtcomm.2023.106195

Cited by 4 publications

(4 citation statements)

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“…Upon the decrease in the polymer content, the water–GO hydrogen bonds increased markedly because of the increase in the size of the water accessible area close to the GO flakes and the higher availability of water molecules to form hydrogen bonds. The water-mediated hydrogen-bonding network between the components of the mixture is expected to play a significant role in the enhancement of the mechanical properties of these composites [ 33 ]. Τhe water percentage corresponding to the systems with the higher GO/BPEI affinity (i.e., S2 and T2) is close to that which was found to lead to an enhanced stiffness of graphene oxide/poly(vinyl) alcohol nanocomposite papers [ 33 ].…”

Section: Discussionmentioning

confidence: 99%

“…The water-mediated hydrogen-bonding network between the components of the mixture is expected to play a significant role in the enhancement of the mechanical properties of these composites [ 33 ]. Τhe water percentage corresponding to the systems with the higher GO/BPEI affinity (i.e., S2 and T2) is close to that which was found to lead to an enhanced stiffness of graphene oxide/poly(vinyl) alcohol nanocomposite papers [ 33 ].…”

Section: Discussionmentioning

confidence: 99%

“…In particular, when aqueous media are used for this purpose, apart from the role of the chemical composition of graphene-based fillers in overcoming hydrophobic interactions, i.e., the degree of oxidation [ 19 , 20 , 21 ] and functionalization [ 22 , 23 , 24 ], the presence of polyelectrolytes is known to facilitate the formation of dispersions with controlled 3D structures via electrostatic stabilization [ 25 , 26 , 27 ]. A category of polymer electrolytes that have commonly been utilized as solubilization and structure-enhancement agents in the aqueous dispersion of oxidized forms of graphene are branched molecules with a dendritic topology [ 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. These molecules contain many functional groups within a small volume, allowing there to be multiple interacting sites with graphene-based fillers, even when small-molecular-weight polymers are used [ 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

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Morphology and Dynamics in Hydrated Graphene Oxide/Branched Poly(ethyleneimine) Nanocomposites: An In Silico Investigation

2023

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Graphene oxide (GO)—branched poly(ethyleneimine) (BPEI) hydrated mixtures were studied by means of fully atomistic molecular dynamics simulations to assess the effects of the size of polymers and the composition on the morphology of the complexes, the energetics of the systems and the dynamics of water and ions within composites. The presence of cationic polymers of both generations hindered the formation of stacked GO conformations, leading to a disordered porous structure. The smaller polymer was found to be more efficient at separating the GO flakes due to its more efficient packing. The variation in the relative content of the polymeric and the GO moieties provided indications for the existence of an optimal composition in which interaction between the two components was more favorable, implying more stable structures. The large number of hydrogen-bonding donors afforded by the branched molecules resulted in a preferential association with water and hindered its access to the surface of the GO flakes, particularly in polymer-rich systems. The mapping of water translational dynamics revealed the existence of populations with distinctly different mobilities, depending upon the state of their association. The average rate of water transport was found to depend sensitively on the mobility of the freely to move molecules, which was varied strongly with composition. The rate of ionic transport was found to be very limited below a threshold in terms of polymer content. Both, water diffusivity and ionic transport were enhanced in the systems with the larger branched polymers, particularly with a lower polymer content, due to the higher availability of free volume for the respective moieties. The detail afforded in the present work provides a new insight for the fabrication of BPEI/GO composites with a controlled microstructure, enhanced stability and adjustable water transport and ionic mobility.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphology and Dynamics in Hydrated Graphene Oxide/Branched Poly(ethyleneimine) Nanocomposites: An In Silico Investigation

2023

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“…Meanwhile, the success of SWE technology depends not only on efficient solar-to-heat conversion but also on ensuring an adequate water supply. This can be addressed by utilizing hydrogel materials known for their highly tunable physicochemical properties, including a high capacity to absorb and retain water. − The presence of hydrophilic functional groups within the hydrogel matrix is crucial, as it not only initiates water activation for reducing energy vaporization but also aids in water supply and transportation through the capillary and osmotic pressure. , In addition to this, hydrogel fabrication techniques are readily scalable for large-scale manufacturing, rendering them suitable for industrial use and decentralized water treatment systems. ,, Among many polymers, poly(vinyl alcohol) (PVA) has gained as a prominent choice for supporting substrates in interfacial SWE because of its hydrophilicity and simple fabrication method. ,− With numerous reactive hydroxyl groups along its polymer chain, PVA exhibits excellent film-forming ability, chemical stability, and high hydrophilicity. , However, PVA alone demonstrates low solar absorptance, limiting its application in SWE technology. By incorporating nanomaterials with superior photothermal effects into PVA networks, PVA hydrogels can enhance their ability to harness solar energy effectively.…”

Section: Introductionmentioning

confidence: 99%

Flexible Photothermal Membrane Based on PVA/Carbon Dot Hydrogel Films for High-Performance Interfacial Solar Evaporation

Indriyati,

Ramadhani,

Permatasari

et al. 2024

ACS Appl. Polym. Mater.

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Interfacial solar-driven water evaporation (SWE) is gaining attention as a promising solution to address the urgent global water shortage. However, developing materials that are simultaneously flexible, durable, costeffective, and easy to prepare while maintaining high light absorption and performance remains a significant challenge. In response, this study introduces an approach using a hydrogel film based on poly(vinyl alcohol) (PVA) integrated with carbon dots (CDs) to leverage their photothermal effect. The preparation method involves mixing and solution casting processes with the addition of citric acid as the green cross-linker, followed by heat treatment. As a result, the swollen PVA/CD hydrogel film exhibits a breaking stress of 9 MPa and an elongation at the break of 247%. Moreover, the hydrophilic nature of PVA ensures efficient water transportation and supply, leading to a remarkable evaporation rate of 1.58 kg m −2 h −1 , 6.1 times higher than that of pure water without hydrogel (0.26 kg m −2 h −1 ), both under 1 sun illumination. Additionally, it demonstrates remarkable stability, maintaining consistent evaporation rates over several cycles, thus indicating its long-term durability and potential for reuse. This study presents a facile yet effective approach to advancing hydrogel films for solar evaporation, offering a promising solution to address water scarcity.

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Novel and stable carbon black/polyvinyl acetal aerogels efficiently harvesting solar energy for seawater desalination

Feng,

Wang,

Liu

et al. 2024

Desalination

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PEI-GOs/PVA photothermal sponge with enhanced interfacial solar steam generation and seawater desalination

Cited by 4 publications

References 59 publications

Morphology and Dynamics in Hydrated Graphene Oxide/Branched Poly(ethyleneimine) Nanocomposites: An In Silico Investigation

Morphology and Dynamics in Hydrated Graphene Oxide/Branched Poly(ethyleneimine) Nanocomposites: An In Silico Investigation

Flexible Photothermal Membrane Based on PVA/Carbon Dot Hydrogel Films for High-Performance Interfacial Solar Evaporation

Novel and stable carbon black/polyvinyl acetal aerogels efficiently harvesting solar energy for seawater desalination

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