Degradation of desiccants in temperature swing adsorption processes: The temperature dependent degradation of zeolites 4A, 13X and silica gels

Jacobs, John H.; Deering, Connor E.; Sui, Ruohong; Lesage, Kevin L.; Marriott, Robert A.

doi:10.1016/j.cej.2022.139049

Cited by 17 publications

(15 citation statements)

References 32 publications

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“…16 Our previous work demonstrated a temperature dependence on the degradation of desiccants, where higher regeneration temperatures result in a greater degree of adsorption capacity loss. 20 Our work also showed that utilizing a wet gas during the thermal regeneration of the desiccants mitigated the degradation of the materials. These results indicate that the major degradation mechanisms are most likely due to (i) mechanical stress from the expansion and contraction of the materials during the heating and cooling steps of the TSA process and (ii) overstripping the highest energy adsorption sites, thus increasing the rate of crystalline rearrangement.…”

Section: Introductionmentioning

confidence: 59%

“…The SEM images (Fig. 11) of the zeolite 13X samples after 5000 TSA cycles showed that all six samples retained sharp edges of the crystallites, whereas the images from the experiments without CO 2 in the gas mixture 20 showed rounding of the crystallite edges.…”

Section: Materials Degradation Correlationmentioning

confidence: 99%

“…For each material, the results of experiments I (blue, J), II (blue, D), III (red, J), IV (red, D), V (purple, J), and VI (purple, D) were compared to the dry (black, J) and wet (black, D) regeneration conditions of the CO 2 free experiments. 20 For all data sets, solid lines represent empirical polynomial fits to guide the eye. all experiments.…”

Section: Materials Degradationmentioning

confidence: 99%

“…6 The BET surface area of zeolite 13X (A), 2.2 nm pore size silica (B), 3.0 nm pore size silica (C), and 6.0 nm pore size silica (D) for the three gas mixtures (p CO 2 = 3.49 kPa, p H 2 O = 2.39 kPa, D; p CO 2 = 3.49 kPa, p H 2 O = 2.21 kPa, J; p CO 2 = 34.9 kPa, p H 2 O = 2.21 kPa, +) and the previously published results (p H 2 O = 2.41 kPa, &) without CO 2 . 20 Results for dry gas (red) and wet gas (blue) regeneration conditions are reported. The solid black line represents the surface area of the fresh material.…”

Section: Materials Degradationmentioning

confidence: 99%

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The role of carbon dioxide and water in the degradation of zeolite 4A, zeolite 13X and silica gels

et al. 2023

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Section: Introductionmentioning

confidence: 59%

Section: Materials Degradation Correlationmentioning

confidence: 99%

Section: Materials Degradationmentioning

confidence: 99%

Section: Materials Degradationmentioning

confidence: 99%

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The role of carbon dioxide and water in the degradation of zeolite 4A, zeolite 13X and silica gels

et al. 2023

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“…At this temperature, the active silanol group (−Si-OH) structure can be preserved to a high extent [ 48 ]. Those groups have an impact on the thermal degradation process of silica gel [ 86 ].…”

Section: Resultsmentioning

confidence: 99%

Removal of Methylene Blue from Aqueous Solution by Mixture of Reused Silica Gel Desiccant and Natural Sand or Eggshell Waste

et al. 2023

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The purpose of this work was to develop, characterize and test new low-cost materials suitable for removing methylene blue dye from water and wastewater by adsorption. The solid materials consisted of silica gel powder (SG), silica gel mixed with eggshell powder (SG-ES) and a mixture of silica gel with sand from the western Iraqi desert (SG-SI). The samples were milled by using an electrical mixer and a ball mill, followed by a drying step. In addition, desert sand was acid-treated in order to remove impurities. The structure and chemical composition of the samples were investigated by X-ray diffraction (XRD), a scanning electron microscopy technique equipped with an energy-dispersive X-ray spectrometer (SEM-EDX), a low-temperature nitrogen adsorption (BET) technique, thermo-analytical (TG/TGA) measurements and Fourier-transformed infrared spectroscopy (FTIR). The previously mentioned materials were tested to remove methylene blue from an aqueous solution. The adsorption experiments were monitored by ultraviolet–visible (UV-Vis) spectrophotometry and showed that SG and SG-ES gave promising results for the methylene blue removal from water. After 40 min of treatment of the aqueous solution containing 20 mg/L of MB at room temperature, the tested SG, SG-ES and SG-SI materials were found to have 86%, 80% and 57% dye adsorption efficiency, respectively. Taking into consideration not only the adsorption activity of the studied material but their availability, cost and concepts of cleaner production and waste minimization, the developed silica gel with eggshell can be considered as a good, cost-effective alternative to commercially available activated-carbon-based adsorbents. Different kinetic and isotherm models were fitted to the experimental results. A pseudo-second-kinetics-order model revealed high correlation fitting, while the Freundlich model was found to appropriately describe the adsorption isotherm. The thermal stability during the possible regeneration process of the SG-ES adsorbent mixture and its interaction mechanism with cationic dye was discussed.

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Efficient Atmospheric Water Harvesting of Superhydrophilic Photothermic Nanocapsule

Han,

Zhong,

Zhang

et al. 2023

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Drought and water scarcity are two of the world's major problems. Solar‐powered sorption‐based atmospheric water harvesting technology is a promising solution in this category. The main challenge is to design materials with high water harvesting performance while achieving fast water vapor adsorption/desorption rates. Here, a superhydrophilic photothermic hollow nanocapsule (SPHN) is represented that achieves efficient atmospheric water harvesting in outdoor climates. In SPHN, the hollow mesoporous silica (HMS) is grafted with polypyrrole (PPy) and also loaded with lithium chloride (LiCl). The hollow structure is used to store water while preventing leakage. The hydrophilic spherical nanocapsule and the trapped water produce more free and weakly adsorbed water. Significantly lower the heat of desorption compared to pure LiCl solution. Such SPHN significantly improves the adsorption/desorption kinetics, e.g., absorbs 0.78–2.01 g of water per gram of SPHN at 25 °C, relative humidity (RH) 30−80% within 3 h. In particular, SPHN has excellent photothermal properties to achieve rapid water release under natural sunlight conditions, i.e., 80−90% of water is released in 1 h at 0.7–1.0 kW m−2 solar irradiation, and 50% of water is released even at solar irradiation as low as 0.4 kW m−2. The water collection capacity can reach 1.2 g g−1 per cycle by using the self‐made atmospheric water harvesting (AWH) device. This finding provides a way to design novel materials for efficient water harvesting tasks, e.g., water engineering, freshwater generator, etc.

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Degradation of desiccants in temperature swing adsorption processes: The temperature dependent degradation of zeolites 4A, 13X and silica gels

Cited by 17 publications

References 32 publications

The role of carbon dioxide and water in the degradation of zeolite 4A, zeolite 13X and silica gels

The role of carbon dioxide and water in the degradation of zeolite 4A, zeolite 13X and silica gels

Removal of Methylene Blue from Aqueous Solution by Mixture of Reused Silica Gel Desiccant and Natural Sand or Eggshell Waste

Efficient Atmospheric Water Harvesting of Superhydrophilic Photothermic Nanocapsule

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