Fe–Co controlled super-hygroscopic hydrogels toward efficient atmospheric water harvesting

Wu, Hangfei; Xiong, Yuli; Yu, Duohuan; Yang, Ping; Shi, Huihui; Huang, Lu; Wu, Yali; Xi, Mufeng; Xiao, Peng; Yang, Lin

doi:10.1039/d2nr04830b

Cited by 15 publications

(4 citation statements)

References 58 publications

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“…The main reason MP‐x can capture moisture from the atmosphere is that water easy for metal salts to produce coordination and form hydrates. [ 47,48 ] As shown in Figure 4b, the water uptake increases as the amount of E‐LiCl doped increases. The addition efficiency of the E‐LiCl is the ratio of the rise in hygroscopicity to the difference in weight of the hygroscopic agent.…”

Section: Resultsmentioning

confidence: 92%

Title High Solar‐Thermal Conversion Aerogel for Efficient Atmospheric Water Harvesting

Wang,

Ma,

Cui

et al. 2023

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The shortage of freshwater is a global problem, however, the gel that can be used for atmospheric water harvesting (AWH) in recent years studying, suffer from salt leakage, agglomeration, and slow water evaporation efficiency. Herein, a solar‐driven atmospheric water harvesting (SAWH) aerogel is prepared by UV polymerization and freeze‐drying technique, using poly(N‐isopropylacrylamide) (PNIPAm), hydroxypropyl cellulose (HPC), ethanolamine‐decorate LiCl (E‐LiCl) and polyaniline (PANI) as raw materials. The PNIPAm and HPC formed aerogel networks makes the E‐LiCl stably and efficiently loaded, improving the water adsorption‐desorption kinetics, and PANI achieves rapid water vapor evaporation. The aerogel has low density ≈0.12–0.15 g cm−3, but can sustain a weight of 1000 times of its own weight. The synergist of elements and structure gives the aerogel has 0.46–2.95 g g−1 water uptake capability at 30–90% relative humidity, and evaporation rate reaches 1.98 kg m−2 h−1 under 1 sun illumination. In outdoor experiments, 88% of the water is harvesting under natural light irradiation, and an average water harvesting rate of 0.80 gwater gsorbent−1 day−1. Therefore, the aerogel can be used in arid and semi‐arid areas to collect water for plants and animals.

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Section: Resultsmentioning

confidence: 92%

Title High Solar‐Thermal Conversion Aerogel for Efficient Atmospheric Water Harvesting

Wang,

Ma,

Cui

et al. 2023

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“…It can be seen that several peaks at 1460, 1250, 1078, and 860 cm À1 are observed, and these peaks belong to CÀH, CÀN, and CÀO species for dehydrated hydrogel. [27][28][29] The NÀH peak at 1608 cm À1 in the hydrogel is ascribed to ÀNH 2 group of ethanolamine ligand, acting as the hydrogen bond donor to adsorb water molecules. [30] Significantly, the strong peak at 3550 cm À1 is assigned to the located water molecules on the hydrated hydrogel's surface, indicating its high affinity toward moisture (In-(H 2 O) n structure).…”

Section: Resultsmentioning

confidence: 99%

A Hydroscopic Indium Hydrogel Capturing Atmospheric Humidity for Autonomous Agriculture

Zhao

Xiong

et al. 2023

Solar RRL

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The atmospheric water is ubiquitous and abundant, which could be effectively exploited for various applications. However, limited efforts devote to agriculture due to the slowly capture kinetics and highly dehydration temperature. Herein, benefit by a super hygroscopic hydrogel, we integrate a self‐sustainable atmospheric water irrigation system for plant growth at arid land. The hydrogel harvests water from the air during the nighttime, and efficiently releases adsorbed water when the system is exposed to sunlight. The water capture behavior by hydrogel is mainly relying on physisorption, multilayer moistures can be accumulated under weakly Van der Waals force. With the help of hydrophilic surface, the indium hydrogel has a maximum water uptake of up to 5.5 g g−1 at 90% RH. This hydrogel will induce a > 40°C surface temperature under AM 1.5G solar illumination, which is enough for water releasing, making the solar energy driven water‐recycling is possible. At last, the collected water quality meets the international drinking water standard, and then resulting a rapid growth of pea over 6 cm within 8 days.This article is protected by copyright. All rights reserved.

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“…However, challenges arise during the water absorption process, including salt solution leakage, particle crystallization and agglomeration, and excessive energy consumption for regeneration [13][14][15]. To address these issues, a commonly employed approach involves embedding salt into porous materials, where the matrix functions as a container to load deliquescent salts [16][17][18][19]. Nevertheless, widely used porous composites like silica gel [16], zeolites [20,21], carbon nanospheres [22], metal-organic frameworks (MOFs) [23,24], POPs [25,26], and COFs [27][28][29] often exhibit unsatisfactory performances due to their limited pore volume [30].…”

Section: Introductionmentioning

confidence: 99%

A Polyzwitterionic@MOF Hydrogel with Exceptionally High Water Vapor Uptake for Efficient Atmospheric Water Harvesting

Yan,

Li,

et al. 2024

Molecules

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Atmospheric water harvesting (AWH) is considered a promising strategy for sustainable freshwater production in landlocked and arid regions. Hygroscopic salt-based composite sorbents have attracted widespread attention for their water harvesting performance, but suffer from aggregation and leakage issues due to the salting-out effect. In this study, we synthesized a PML hydrogel composite by incorporating zwitterionic hydrogel (PDMAPS) and MIL-101(Cr) as a host for LiCl. The PML hydrogel was characterized using various techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), and thermogravimetric analysis (TGA). The swelling properties and water vapor adsorption-desorption properties of the PML hydrogel were also assessed. The results demonstrate that the MIL-101(Cr) was uniformly embedded into PDMAP hydrogel, and the PML hydrogel exhibits a swelling ratio of 2.29 due to the salting-in behavior. The PML hydrogel exhibited exceptional water vapor sorption capacity of 0.614 g/g at 298 K, RH = 40% and 1.827 g/g at 298 K, RH = 90%. It reached 80% of its saturated adsorption capacity within 117 and 149 min at 298 K, RH = 30% and 90%, respectively. Additionally, the PML hydrogel showed excellent reversibility in terms of water vapor adsorption after ten consecutive cycles of adsorption-desorption. The remarkable adsorption capacity, favorable adsorption-desorption rate, and regeneration stability make the PML hydrogel a potential candidate for AWH. This polymer-MOF synergistic strategy for immobilization of LiCl in this work offers new insights into designing advanced materials for AWH.

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Fe–Co controlled super-hygroscopic hydrogels toward efficient atmospheric water harvesting

Abstract: Extracting atmospheric moisture for freshwater production is an appealing way to mitigate the global water crisis. However, the low moisture sorption capacity and high desorption temperature are the major bottlenecks...

Cited by 15 publications

References 58 publications

Title High Solar‐Thermal Conversion Aerogel for Efficient Atmospheric Water Harvesting

Title High Solar‐Thermal Conversion Aerogel for Efficient Atmospheric Water Harvesting

A Hydroscopic Indium Hydrogel Capturing Atmospheric Humidity for Autonomous Agriculture

A Polyzwitterionic@MOF Hydrogel with Exceptionally High Water Vapor Uptake for Efficient Atmospheric Water Harvesting

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