Starch-derived photoresponsive high-efficientcy hygroscopic hydrogel for all-weather atmospheric water harvesting

Zhan, Haifei; Zhou, Zhiliang; Du, Jie; Pei, Xiangjun; Zhou, Lihong

doi:10.1016/j.jclepro.2023.137897

Cited by 24 publications

(8 citation statements)

References 43 publications

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“…50 In Figure 3d, the peaks at 532.90, 532.22, and 531.50 eV belong to O�C−O, C�O, and C−O−C bonds, in addition to the O−Ca bond detected near 530.70 eV for SCA and SCAC, suggesting the successful loading of CA in SCA and SCAC. 51 The peaks belonging to the −NH− and −NH 2 bonds can be seen in the N 1s XPS spectra at 399.64 and 400.40 eV in both SCA and SCAC (Figure 3e). 52 Therefore, according to the XPS characterization results, the positions of the corresponding C, O, N, and Ca in SCA and SCAC are basically unchanged, which indicates that the loading of carbon dots on the surface of SCA will not affect its chemical structure.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Green Synthesis of Polyurethane Sponge-Grafted Calcium Alginate with Carbon Ink Aerogel with High Water Vapor Harvesting Capacity for Solar-Driven All-Weather Atmospheric Water Harvesting

Liu,

Xu,

Wang

et al. 2024

Langmuir

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Atmospheric water harvesting (AWH) technology is a new strategy for alleviating freshwater scarcity. Adsorbent materials with high hygroscopicity and high photothermal conversion efficiency are the key to AWH technology. Hence, in this study, a simple and large-scale preparation for a hygroscopic compound of polyurethane (PU) sponge-grafted calcium alginate (CA) with carbon ink (SCAC) was developed. The PU sponge in the SCAC aerogel acts as a substrate, CA as a moisture adsorber, and carbon ink as a light adsorber. The SCAC aerogel exhibits excellent water absorption of 0.555−1.40 g•g −1 within a wide range of relative humidity (40−80%) at 25 °C. The SCAC aerogel could release adsorbed water driven by solar energy, and more than 92.17% of the adsorbed water could be rapidly released over a wide solar intensity range of 1.0−2.0 sun. In an outdoor experiment, 57.517 g of SCAC was able to collect 32.8 g of clean water in 6 h, and the water quality meets the drinking water standards set by the World Health Organization. This study suggests a new approach to design promising AWH materials and infers the potential practical application of SCAC aerogel-based adsorbents.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Green Synthesis of Polyurethane Sponge-Grafted Calcium Alginate with Carbon Ink Aerogel with High Water Vapor Harvesting Capacity for Solar-Driven All-Weather Atmospheric Water Harvesting

Liu,

Xu,

Wang

et al. 2024

Langmuir

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“…f) Comparison of water desorption behaviors in the first 150 min, under 1.0 sun solar illumination. [ 19,35,73,79–81 ]…”

Section: Resultsmentioning

confidence: 99%

Entangled Mesh Hydrogels with Macroporous Topologies via Cryogelation for Rapid Atmospheric Water Harvesting

Sun,

Ni,

et al. 2024

Advanced Materials

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Sorption‐based atmospheric water harvesting (SAWH) is a promising technology to alleviate freshwater scarcity. Recently, hygroscopic salt‐hydrogel composites (HSHCs) have emerged as attractive candidates with their high water uptake, versatile designability, and scale‐up fabrication. However, achieving high‐performance SAWH applications for HSHCs has been challenging because of their sluggish kinetics, attributed to their limited mass transport properties. Herein, a universal network engineering of hydrogels using a cryogelation method is presented, significantly improving the SAWH kinetics of HSHCs. As a result of the entangled mesh confinements formed during cryogelation, a stable macroporous topology is attained and maintained within the obtained entangled‐mesh hydrogels (EMHs), leading to significantly enhanced mass transport properties compared to conventional dense hydrogels (CDHs). With it, corresponding hygroscopic EMHs (HEMHs) simultaneously exhibit faster moisture sorption and solar‐driven water desorption. Consequently, a rapid‐cycling HEMHs‐based harvester delivers a practical freshwater production of 2.85 Lwater kgsorbents−1 day−1 via continuous eight sorption/desorption cycles, outperforming other state‐of‐the‐art hydrogel‐based sorbents. Significantly, the generalizability of this strategy has been validated by extending it to other hydrogels used in HSHCs. Overall, this work offers a new approach to efficiently address long‐standing challenges of sluggish kinetics in current HSHCs, promoting them toward the next‐generation SAWH applications.This article is protected by copyright. All rights reserved

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“…Notably, the hydrogels exhibit much higher water uptake capacity at 90% RH compared to 80% RH because of the higher moisture uptake rate of the hydrogels. 54 Moreover, increasing the temperature from 25 to 65 1C enhanced the weight change (change in weight of hydrogels/ original weight of hydrogels) of the PAM-LiCl ionic hydrogels from 0.324 to 0.684 g g À1 (Fig. 2g), which may be due to the fact that increasing the temperature enhances the solubility of the hydrogels, and the swelling property of the hydrogel network is able to expose more water trapping centers to promote its uptake kinetics from the liquid-state water.…”

Section: Energy and Environmental Science Papermentioning

confidence: 99%

Silicon nanowire/ionic hydrogel-based hybrid moist-electric generators with enhanced voltage output and operational stability

Duan,

Shao,

Wang

et al. 2024

Energy Environ. Sci.

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Starch-derived photoresponsive high-efficientcy hygroscopic hydrogel for all-weather atmospheric water harvesting

Cited by 24 publications

References 43 publications

Green Synthesis of Polyurethane Sponge-Grafted Calcium Alginate with Carbon Ink Aerogel with High Water Vapor Harvesting Capacity for Solar-Driven All-Weather Atmospheric Water Harvesting

Green Synthesis of Polyurethane Sponge-Grafted Calcium Alginate with Carbon Ink Aerogel with High Water Vapor Harvesting Capacity for Solar-Driven All-Weather Atmospheric Water Harvesting

Entangled Mesh Hydrogels with Macroporous Topologies via Cryogelation for Rapid Atmospheric Water Harvesting

Silicon nanowire/ionic hydrogel-based hybrid moist-electric generators with enhanced voltage output and operational stability

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