Adsorption of volatile hydrocarbons in iron polysulfide chalcogels

Handle URI:
http://hdl.handle.net/10754/563818
Title:
Adsorption of volatile hydrocarbons in iron polysulfide chalcogels
Authors:
Ahmed, Ejaz; Rothenberger, Alexander
Abstract:
We report the synthesis, characterization and possible applications of three new metal-chalcogenide aerogels KFe3Co3S 21, KFe3Y3S22 and KFe 3Eu3S22. Metal acetates react with the alkali metal polychalcogenides in formamide/water mixture to form extended polymeric frameworks that exhibit gelation phenomena. Amorphous aerogels obtained after supercritical CO2 drying have BET surface area from 461 to 573 m 2/g. Electron microscopy images and nitrogen adsorption measurements showed that pore sizes are found in micro (below 2 nm), meso (2-50 nm), and macro (above 50 nm) porous regions. These chalcogels possess optical bandgaps in the range of 1.55-2.70 eV. These aerogels have been studied for the adsorption of volatile hydrocarbons and gases. A much higher adsorption of toluene in comparison with cyclohexane and cyclopentane vapors have been observed. The adsorption capacities of the three volatile hydrocarbons are found in the following order: toluene > cyclohexane > cyclopentane. It has been observed that high selectivity in adsorption is feasible with high-surface-area metal chalcogenides. Similarly, almost an eight to ten times increase in adsorption selectivity towards CO2 over H2/CH4 was observed in the aerogels. Moreover, reversible ion-exchange properties for K+/Cs+ ions have also been demonstrated. © 2014 Elsevier Inc. All rights reserved.
KAUST Department:
KAUST Solar Center (KSC); Physical Sciences and Engineering (PSE) Division; Chemical Science Program
Publisher:
Elsevier BV
Journal:
Microporous and Mesoporous Materials
Issue Date:
Nov-2014
DOI:
10.1016/j.micromeso.2014.08.014
Type:
Article
ISSN:
13871811
Sponsors:
ICP-OES, CHN, Raman and UV-Vis/IR-spectroscopy measurements were carried out in the Analytical Core Lab at KAUST while electron microscope imaging work (TEM, SEM) was performed in the Advanced Nanofabrication, Imaging and Characterization Core Lab at KAUST. We wish to express our sincere gratitude to Dr. M. Shafaei-Fallah for her valuable suggestions in synthesis and gas adsorption studies. We are also grateful to Mr. Giulio Planu for his assistance in synthesis and Dr. V.Q. Wang for TEM images. This research was supported by King Abdullah University of Science and Technology (KAUST) baseline funding.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

Full metadata record

DC FieldValue Language
dc.contributor.authorAhmed, Ejazen
dc.contributor.authorRothenberger, Alexanderen
dc.date.accessioned2015-08-03T12:15:26Zen
dc.date.available2015-08-03T12:15:26Zen
dc.date.issued2014-11en
dc.identifier.issn13871811en
dc.identifier.doi10.1016/j.micromeso.2014.08.014en
dc.identifier.urihttp://hdl.handle.net/10754/563818en
dc.description.abstractWe report the synthesis, characterization and possible applications of three new metal-chalcogenide aerogels KFe3Co3S 21, KFe3Y3S22 and KFe 3Eu3S22. Metal acetates react with the alkali metal polychalcogenides in formamide/water mixture to form extended polymeric frameworks that exhibit gelation phenomena. Amorphous aerogels obtained after supercritical CO2 drying have BET surface area from 461 to 573 m 2/g. Electron microscopy images and nitrogen adsorption measurements showed that pore sizes are found in micro (below 2 nm), meso (2-50 nm), and macro (above 50 nm) porous regions. These chalcogels possess optical bandgaps in the range of 1.55-2.70 eV. These aerogels have been studied for the adsorption of volatile hydrocarbons and gases. A much higher adsorption of toluene in comparison with cyclohexane and cyclopentane vapors have been observed. The adsorption capacities of the three volatile hydrocarbons are found in the following order: toluene > cyclohexane > cyclopentane. It has been observed that high selectivity in adsorption is feasible with high-surface-area metal chalcogenides. Similarly, almost an eight to ten times increase in adsorption selectivity towards CO2 over H2/CH4 was observed in the aerogels. Moreover, reversible ion-exchange properties for K+/Cs+ ions have also been demonstrated. © 2014 Elsevier Inc. All rights reserved.en
dc.description.sponsorshipICP-OES, CHN, Raman and UV-Vis/IR-spectroscopy measurements were carried out in the Analytical Core Lab at KAUST while electron microscope imaging work (TEM, SEM) was performed in the Advanced Nanofabrication, Imaging and Characterization Core Lab at KAUST. We wish to express our sincere gratitude to Dr. M. Shafaei-Fallah for her valuable suggestions in synthesis and gas adsorption studies. We are also grateful to Mr. Giulio Planu for his assistance in synthesis and Dr. V.Q. Wang for TEM images. This research was supported by King Abdullah University of Science and Technology (KAUST) baseline funding.en
dc.publisherElsevier BVen
dc.subjectAdsorptionen
dc.subjectChalcogelen
dc.subjectHydrocarbonsen
dc.subjectMesoporous materialsen
dc.titleAdsorption of volatile hydrocarbons in iron polysulfide chalcogelsen
dc.typeArticleen
dc.contributor.departmentKAUST Solar Center (KSC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical Science Programen
dc.identifier.journalMicroporous and Mesoporous Materialsen
kaust.authorAhmed, Ejazen
kaust.authorRothenberger, Alexanderen
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