Water Adsorption on Clay Minerals As a Function of Relative Humidity: Application of BET and Freundlich Adsorption Models

Hatch, C. D.; Wiese, Jadon S.; Crane, Cameron C.; Harris, Kenneth J.; Kloß, H.; Baltrušaitis, Jonas

doi:10.1021/la2042873

Cited by 234 publications

(241 citation statements)

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“…Figure 6 also shows the water adsorption isotherm of illite (lower panel, red curve, right y axis) reported by (Hatch et al, 2012). One possible explanation for the decrease in (N 2 O 5 ) with increasing RH is an increasing rate of deactivation of reactive surface groups (e.g.…”

Section: Discussionmentioning

confidence: 95%

“…However, as hydrolysis (solvation/ionization of N 2 O 5 to NO + 2 and NO − 3 ) will require more than one adjacent, surface-adsorbed H 2 O molecule, the latter will likely only take place under conditions of multi-layer adsorption, with an unknown RH threshold. In this context, we note that illite, with the general formula: M x [Si 6.8 (Hatch et al, 2012), has four OH groups in each structure unit. Previous experimental and theoretical work has shown that N 2 O 5 reaction on mineral surfaces is partially controlled by the availability of surface OH groups.…”

Section: Discussionmentioning

confidence: 99%

“…We extend this database by investigating the effects of relative humidity on the uptake of N 2 O 5 to illite, one of the most abundant clay minerals in dust particles (Chester, 1990;Claquin et al, 1999;Nickovic et al, 2012) and one of the most efficient ice nuclei in the troposphere (Eastwood et al, 2008;Zimmermann et al, 2008 4 (where M is a monovalent interlamellar cation), is a non-expansive clay mineral characterized by aluminosilicate layers containing one octahedral alumina sheet sandwiched by two tetrahedral silica sheets (Hatch et al, 2012). At room temperature one monolayer of surface-adsorbed water is formed at ∼ 15 % RH (Hatch et al, 2012), and the amount of adsorbed water increases to 0.15-0.2 g water per gram illite (corresponding to ∼ 60-80 formal monolayers of water) at ∼ 70 % RH (Schuttlefield et al, 2007;Hatch et al, 2012).…”

Section: J Tang Et Al: Heterogeneous Reaction Of N 2 O 5 With Ilmentioning

confidence: 99%

“…At room temperature one monolayer of surface-adsorbed water is formed at ∼ 15 % RH (Hatch et al, 2012), and the amount of adsorbed water increases to 0.15-0.2 g water per gram illite (corresponding to ∼ 60-80 formal monolayers of water) at ∼ 70 % RH (Schuttlefield et al, 2007;Hatch et al, 2012). For comparison, we have also investigated the uptake of N 2 O 5 to ATD, which is essentially ground sand from the Arizona desert and which, although possessing a mineralogy that does not correspond closely to that of globally important sources of atmospheric mineral dust aerosols (e.g.…”

Section: J Tang Et Al: Heterogeneous Reaction Of N 2 O 5 With Ilmentioning

confidence: 99%

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Heterogeneous reaction of N2O5 with illite and Arizona test dust particles

2014

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Abstract. The heterogeneous reaction of N 2 O 5 with airborne illite and Arizona test dust (ATD) particles was investigated at room temperature and at different relative humidities using an atmospheric pressure aerosol flow tube. N 2 O 5 at concentrations in the range 8 to 24 × 10 12 molecule cm −3 was monitored using thermal-dissociation cavity ring-down spectroscopy at 662 nm. At zero relative humidity a large uptake coefficient of N 2 O 5 to illite was obtained, γ (N 2 O 5 ) = 0.09, which decreased to 0.04 as relative humidity was increased to 67 %. In contrast, the uptake coefficient derived for ATD is much lower (∼ 0.006) and displays a weaker (if any) dependence on relative humidity (0-67 %). Potential explanations are given for the significant differences between the uptake behaviour for ATD and illite and the results are compared with uptake coefficients for N 2 O 5 on other mineral surfaces.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: J Tang Et Al: Heterogeneous Reaction Of N 2 O 5 With Ilmentioning

confidence: 99%

Section: J Tang Et Al: Heterogeneous Reaction Of N 2 O 5 With Ilmentioning

confidence: 99%

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Heterogeneous reaction of N2O5 with illite and Arizona test dust particles

2014

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“…Water isotherms in cellulose and pharmaceutical powders also show a water content of ~ 6−10 wt.% at moderate humidities, largely due to multilayers [69]. Clay minerals show multilayer adsorption above 15% RH and contents of 5−10 wt.% at 40% RH [70,71], and setup of capillary condensation at 80% RH [71]. Capillary condensation is settled by the radius r k of the liquid meniscus to be formed (Kelvin radius) given by r k = −V m /R g Tln(RH/100), where  is the liquid-gas surface tension, V m is the molar volume of the liquid and R g is the molar gas constant.…”

Section: Water In Colloidal Crystalsmentioning

confidence: 99%

Colloidal crystals and water: Perspectives on liquid–solid nanoscale phenomena in wet particulate media

Gallego-Gómez

Morales‐Flórez

Morales

et al. 2016

Advances in Colloid and Interface Science

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Solid colloidal ensembles inherently contain water adsorbed from the ambient moisture. This water, confined in the porous network formed by the building submicron spheres, greatly affects the ensemble properties. Inversely, one can benefit from such influence on collective features to explore the water behavior in such nanoconfinements. Recently, novel approaches have been developed to investigate in-depth where and how water is placed in the nanometric pores of self-assembled colloidal crystals. Here we summarize these advances, along with new ones, that are linked to general interfacial water phenomena like adsorption, capillary forces and flow. Waterdependent structural properties of the colloidal crystal give clues to the interplay between nanoconfined water and solid fine particles that determines the behavior of ensembles. We elaborate on how the knowledge gained on water in colloidal crystals provides new opportunities for multidisciplinary study of interfacial and nanoconfined liquids and their essential role in the physics of utmost important systems such as particulate media.

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Highly Efficient Clean Water Production from Contaminated Air with a Wide Humidity Range

et al. 2019

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contaminated inevitably by the impurities, such as microorganisms, fine particulate matters (PM), and toxic gases like sulfur oxides (SO x ). [11,12] Recently, miscellaneous hygroscopic materials have been explored for moisture capture. For instance, metalorganic frameworks (MOFs) like MOF-801 could harvest 0.25 g g −1 water at a relative humidity (RH) of 20%, and poly(Nisopropyl acrylamide)/sodium alginate (PNIPAAm/Alg) polymer hydrogel demonstrated 0.6 g g −1 water uptake at the RH of 80%, respectively. [13][14][15][16] However, MOF-801 only worked in a narrow RH range (<20% RH) with low water uptake, and the quality of the oozed water from PNI-PAAm/Alg hydrogel was uncertain for the risk of impurities. As a result, it is still a big challenge for harvesting high-quality clean water free of impurities from the air within a full range of humidity.Herein, we demonstrate a highly efficient clean water production system from a contaminated environment with a wide range of humidity based on a rationally designed sodium polyacrylate (PAAS)/graphene framework (PGF). This porous framework with plentiful oxygen functional groups facilitates the sorption of water vapor in humid air and simultaneously grabs the impurities under van der Waals force (Figure 1). Moreover, a high solar-thermal conversion capability of PGF makes water easily desorbed under sun irradiation. [2,17,18] As a result, such a PGF presents the equilibrium water uptake of 0.14 g g −1 at a low RH of 15%, and a superhigh uptake of 5.20 g g −1 at an RH of 100%, exhibiting the excellent water uptake ability in a wide range of humidity. Under solar irradiation of 1 sun (1 kW m −2 ), the sorbed water can be quickly desorbed into vapor within a few minutes to generate clean water free of impurities. Thus, the PGF meets the requirements of efficient moisture capture, impurities filtration, and clean water production from natural air. For practical application, a lab-made prototype of moisture purification and water harvest (MPWH) system is built to collect over 25 L clean water per kilogram of PGF daily from the atmospheric environment. This PGF offers an efficient platform to capture moisture in ordinary and contaminated air for the production of high-quality clean water.The porous PGF is easily prepared through a convenient freeze-drying method (see details in Materials and Methods, Supporting Information). Typically, PAAS is well dispersed in a graphene oxide (GO) dispersion after ultrasonic treatment (Figure 2a). After the freeze-drying (Figure 2b) and reductionThe huge amount of moisture in the air is an unexplored and overlooked water resource in nature, which can be useful to solve the worldwide water shortage. However, direct water condensation from natural or even hazy air is always inefficient and inevitably contaminated by numerous impurities of dust, toxic gas, and microorganisms. In this regard, a drinkable and clean water harvester from complex contaminated air with a wide humidity range based on porous sodium polyacrylate/graphene framework (PGF...

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Water Adsorption on Clay Minerals As a Function of Relative Humidity: Application of BET and Freundlich Adsorption Models

Cited by 234 publications

References 87 publications

Heterogeneous reaction of N<sub>2</sub>O<sub>5</sub> with illite and Arizona test dust particles

Heterogeneous reaction of N<sub>2</sub>O<sub>5</sub> with illite and Arizona test dust particles

Colloidal crystals and water: Perspectives on liquid–solid nanoscale phenomena in wet particulate media

Highly Efficient Clean Water Production from Contaminated Air with a Wide Humidity Range

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Water Adsorption on Clay Minerals As a Function of Relative Humidity: Application of BET and Freundlich Adsorption Models

Cited by 234 publications

References 87 publications

Heterogeneous reaction of N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; with illite and Arizona test dust particles

Heterogeneous reaction of N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; with illite and Arizona test dust particles

Colloidal crystals and water: Perspectives on liquid–solid nanoscale phenomena in wet particulate media

Highly Efficient Clean Water Production from Contaminated Air with a Wide Humidity Range

Contact Info

Product

Resources

About

Heterogeneous reaction of N<sub>2</sub>O<sub>5</sub> with illite and Arizona test dust particles

Heterogeneous reaction of N<sub>2</sub>O<sub>5</sub> with illite and Arizona test dust particles