Extraordinary air water harvesting performance with three phase sorption

Entezari, Akram; Ejeian, Mojtaba; Wang, R.Z.

doi:10.1016/j.mtener.2019.07.001

Cited by 50 publications

(26 citation statements)

References 22 publications

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“…(H) The water sorption capacity comparison of recently reported state-of-the-art sorbents,10,21,33,36,38,41,43,47,63 showing the record water sorption capacity of LiCl@rGO-SA under typical working conditions of sorption-based atmospheric water harvesting. (I) The water sorption kinetics comparison of recently reported state-of-the-art composite sorbent,20,[43][44][45]47,48,61,64 showing the faster water sorption rates of LiCl@rGO-SA and confirming the great contribution of vertical aligned pore structures to accelerate water sorption kinetics. For the fair comparison, we compared the LiCl@rGO-SA with other typical SAWH composite sorbents under similar testing conditions of arid climates under 20-40% RH (see details in Table…”

mentioning

confidence: 76%

“…Therefore, avoiding the packed agglomeration of salts inside porous matrix is the common objective for all composite sorbents using hygroscopic salts. 20,22,23,31,43,45,55,61 The elemental mapping with EDX of LiCl@rGO-SA sorbent shows LiCl crystals uniformly distribute on the surface of pores inside the rGO-SA matrix (Figure 1I, Figure S7); remarkably, appearing as many individual 200-900 nm cubic salt particles, which is in favor of faster water capture due to large sorption interface areas and less reaction resistance (see SEM image of cubic salt particles in Figure S8). This special phenomenon can be attributed to the low concentration of salt solution (10%), weak nucleation resistance of crystallization on moderately hydrophilic rGO-SA surface, and slowly crystallization process during soaking-drying process.…”

Section: Synthesis and Characterization Of Vertically Aligned Nanocomposite Sorbentsmentioning

confidence: 99%

“…The GO-SA matrix shows hierarchical pores with a wide size distribution ranging from two μm to hundred μm, featuring an ultra large pore volume of 20.78 cm 3 g -1 , an order of magnitude higher than other reported porous matrixes. 22,43,61 This extraordinary large pore volume is ascribe to the light-weight and thin GO walls of the high-porosity 3D architectures, formed during freezing casting process, where GO sheets are rejected from the forming ice and entrapped between neighboring ice crystals to form a continuous network. 62 Consequently, the synthesized nanocomposite sorbents show a record salt content of 78 wt% even using a low concentration (10 wt%) of LiCl solution in soaking process.…”

Section: Synthesis and Characterization Of Vertically Aligned Nanocomposite Sorbentsmentioning

confidence: 99%

See 2 more Smart Citations

Ultrahigh solar-driven atmospheric water production enabled by scalable rapid-cycling water harvester with vertically aligned nanocomposite sorbent

Yan

et al. 2021

Energy Environ. Sci.

240

131

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mentioning

confidence: 76%

Section: Synthesis and Characterization Of Vertically Aligned Nanocomposite Sorbentsmentioning

confidence: 99%

Section: Synthesis and Characterization Of Vertically Aligned Nanocomposite Sorbentsmentioning

confidence: 99%

See 1 more Smart Citation

Ultrahigh solar-driven atmospheric water production enabled by scalable rapid-cycling water harvester with vertically aligned nanocomposite sorbent

Yan

et al. 2021

Energy Environ. Sci.

240

131

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“…SCLI, ASLI, ELI, ESLI, 99 ACF + LiCl, 110 HCS-LiCl, 108 and K-LiCl. 113 adsorption and desorption, the amount of water harvested was different. During adsorption, the RH was kept at 65%, 75%, and 85% and the water collected was 12.5, 13.6, and 14.7 kg, respectively.…”

Section: Composite Adsorbentsmentioning

confidence: 99%

An overview of solid and liquid materials for adsorption-based atmospheric water harvesting

Wasti

Sultan

Aleem

et al. 2022

Advances in Mechanical Engineering

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Thermally driven adsorption-based atmospheric water harvesting (AWH) is becoming an emerging technology to provide potable water. In this regard, various adsorbent materials including solid (MOFs, silica-gels, and zeolites), liquid (CaCl2 and LiCl), and composite adsorbents are explored in the literature. This study reviews recent advancements in adsorbent materials based on their water production capacity at different conditions that is air temperature and relative humidity (RH). The MOF of type MIL-101(Cr) shows water production capacity of 3.10 L/m2/day at RH ranging from 10% to 40%. Similarly, Zr-MOF-808 possesses water production capacity of 8.60 L/m2/day at RH more than 50%. Among the studied silica-gels, mesoporous silica-gel shows highest water production capacity that is 1.30 L/m2/day at RH ranging from 10% to 40%. The zeolite yielded water production capacity of 0.94 L/m2/day at RH ranging from 10% to 40%. On the other hand, liquid adsorbents like CaCl2 + cloth, K-LiCl showed water production capacity of 3.02 L/m2/day, and 2.9 g/g/day, respectively at RH of about 70%. Composite adsorbent modified with binary salts and functionalized carbon nanotubes resulted water production capacity of 5.60 g/g at RH of about 35%. The study will be useful to identify the energy-efficient adsorbent for the development of sustainable AWH device.

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“…An adsorbent with heat storage capacity can be the matrix material itself, for instance, zeolite [124,125] and silica gel [126,127]. Otherwise, it may be a non-absorbent substance that has strong properties for heat and mass transfer such as expanded graphite [70,[128][129][130][131], which has high thermal conductivity, or activated carbon [132] and activated carbon fibers [133][134][135][136], which have high porosity, surface area, and thermal conductivity. Natural rocks [137][138][139] and metal foams [140,141] such as expanded vermiculite are also frequently used as matrix materials for composite adsorbents.…”

Section: Composites Based Salt Hydratesmentioning

confidence: 99%

Survey Summary on Salts Hydrates and Composites Used in Thermochemical Sorption Heat Storage: A Review

Zbair

Bennici

2021

Energies

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To improve the proficiency of energy systems in addition to increasing the usage of renewable energies, thermal energy storage (TES) is a strategic path. The present literature review reports an overview of the recent advancements in the utilization of salt hydrates (single or binary mixtures) and composites as sorbents for sorption heat storage. Starting by introducing various heat storage systems, the operating concept of the adsorption TES was clarified and contrasted to other technologies. Consequently, a deep examination and crucial problems related to the different types of salt hydrates and adsorbents were performed. Recent advances in the composite materials used in sorption heat storage were also reviewed and compared. A deep discussion related to safety, price, availability, and hydrothermal stability issues is reported. Salt hydrates display high theoretical energy densities, which are promising materials in TES. However, they show a number of drawbacks for use in the basic state including low temperature overhydration and deliquescence (e.g., MgCl2), high temperature degradation, sluggish kinetics leading to a low temperature rise (e.g., MgSO4), corrosiveness and toxicity (e.g., Na2S), and low mass transport due to the material macrostructure. The biggest advantage of adsorption materials is that they are more hydrothermally stable. However, since adsorption is the most common sorption phenomenon, such materials have a lower energy content. Furthermore, when compared to salt hydrates, they have higher prices per mass, which reduces their appeal even further when combined with lower energy densities. Economies of scale and the optimization of manufacturing processes may help cut costs. Among the zeolites, Zeolite 13X is among the most promising. Temperature lifts of 35–45 °C were reached in lab-scale reactors and micro-scale experiments under the device operating settings. Although the key disadvantage is an excessively high desorption temperature, which is problematic to attain using heat sources, for instance, solar thermal collectors. To increase the energy densities and enhance the stability of adsorbents, composite materials have been examined to ameliorate the stability and to achieve suitable energy densities. Based on the reviewed materials, MgSO4 has been identified as the most promising salt; it presents a higher energy density compared to other salts and can be impregnated in a porous matrix to prepare composites in order to overcome the drawbacks connected to its use as pure salt. However, due to pore volume reduction, potential deliquescence and salt leakage from the composite as well as degradation, issues with heat and mass transport can still exist. In addition, to increase the kinetics, stability, and energy density, the use of binary salt deposited in a porous matrix is suitable. Nevertheless, this solution should take into account the deliquescence, safety, and cost of the selected salts. Therefore, binary systems can be the solution to design innovative materials with predetermined sorption properties adapted to particular sorption heat storage cycles. Finally, working condition, desorption temperature, material costs, lifetime, and reparation, among others, are the essential point for commercial competitiveness. High material costs and desorption temperatures, combined with lower energy densities under normal device operating conditions, decrease their market attractiveness. As a result, the introduction of performance metrics within the scientific community and the use of economic features on a material scale are suggested.

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Extraordinary air water harvesting performance with three phase sorption

Cited by 50 publications

References 22 publications

Ultrahigh solar-driven atmospheric water production enabled by scalable rapid-cycling water harvester with vertically aligned nanocomposite sorbent

Ultrahigh solar-driven atmospheric water production enabled by scalable rapid-cycling water harvester with vertically aligned nanocomposite sorbent

An overview of solid and liquid materials for adsorption-based atmospheric water harvesting

Survey Summary on Salts Hydrates and Composites Used in Thermochemical Sorption Heat Storage: A Review

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