Development of Composite Adsorbents of Carbon and Intercalated Clay for N2and O2Adsorption: A Preliminary Study

Zhu, Hua; Vansant, Etienne F.; Lu, Gao Qing

doi:10.1006/jcis.1998.5916

Cited by 21 publications

(10 citation statements)

References 25 publications

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“…However, no significant increase in specific surface area has been observed for the products thus obtained. In a previous study, we found that the Al-PILC prepared in the presence of PVA has poor long-range order, but a relatively large pore volume, which mainly arises from mesopores. In contrast, the long-range order in the alumina-pillared clay prepared in the presence of alkyl polyether was substantially improved .…”

Section: Introductionmentioning

confidence: 92%

Engineering the Structures of Nanoporous Clays with Micelles of Alkyl Polyether Surfactants

Zhu

2001

Langmuir

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Composite clay nanostructures (CCNs) were observed in intercalating Laponite clay with alumina in the presence of alkyl polyether surfactants which contain hydrophobic alkyl chains and ether groups. Such nanostructured clays are highly porous solids consisting of randomly orientated clay platelets intercalated with alumina nanoparticles. The pores in the product solids are larger than the dimension of the surfactant molecules, ranging from 2 to 10 nm. This suggests that the micelles of the surfactant molecules, rather than the molecules, act as templates in the synthesis. Interestingly, it is found that the size of the framework pores was directly proportional to the amount of the surfactants in terms of moles, but shows no evident dependence on the size of the surfactant molecules. Broad pore size distributions were observed for the product CCNs. This study demonstrates that introducing surfactants in the pillaring process of clays is a powerful strategy for tailoring the pore structures of nanoporous clays. With this new technique, it is possible to design and engineer such composite clay nanostructures with desired pore and surface properties by the proper choice of surfactant amounts and preparation conditions.

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Section: Introductionmentioning

confidence: 92%

Engineering the Structures of Nanoporous Clays with Micelles of Alkyl Polyether Surfactants

Zhu

2001

Langmuir

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“…Analogous porous inorganic materials have also been investigated and developed for adsorption and separation processes. Examples include natural and synthetic zeolites, − clay minerals , and their organic derivatives, , and natural microporous oxides (γ-alumina, ferrites, goethite, manganese oxides). , Also, carbon molecular sieves are materials essential in technological processes of high value, such as liquid adsorption and separation of gaseous mixtures. , For instance, CO 2 gas separation is important in the upgrade of natural gas and decarbonization of gasified fuels, while its capture and storage are very important processes in reducing the green-house emissions.…”

Section: Introductionmentioning

confidence: 99%

Aqueous and Gaseous Adsorption from Montmorillonite−Carbon Composites and from Derived Carbons

et al. 2005

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Clay-carbon composites and the carbons derived from demineralization of the clay template were examined for their aqueous adsorption properties (2,4,6-trichlorophenol and methylene blue) and for their gas adsorption/separation abilities regarding CO(2), CH(4), and N(2) gases. The sorption results are discussed in relation with their structural properties (surface area, pore width and volume, and surface chemistry). It was found that the properties of the adsorbents depend highly on the synthetic route, for instance, on the use of clay or H(2)SO(4) as structure mediating and activating agents, respectively. Particularly, the simultaneous use of clay and H(2)SO(4) leads to a synergistic action, which imparts to the final solids the highest sorption capacity and the best potential for separation of CO(2) from gaseous mixtures of CH(4) and N(2).

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“…Although sintering effects are unlikely to occur in the clay films even at the highest firing temperature (700 • C) used in this work, significant reduction of the active intercrystal pore volume may be caused by decreases in interlayer spacing as dehydration deepens [16,18]. The reduction of active pore volume might have caused the diminishing water permeability of the membranes fired at 600 and 700 • C. Moreover, the hydrophobicity of the clay surface may increase with firing temperature that increases the resistance of water transport in its mesoporous system.…”

Section: Discussionmentioning

confidence: 91%

“…This irreversibility of dehydration is likely due to two reasons: the first is the decrease in interlayer distance and reduction of active porosity, which prevent water molecules from reentering the interlayer space [11,16], and the second is the decrease in hydrophilicity of the clay surface with increasing firing temperature [17]. Therefore, the effective pathway for water permeation in the membrane is the intercrystal mesopores rather than the interlayer spaces.…”

Section: Discussionmentioning

confidence: 96%

Preparation of α-alumina-supported mesoporous bentonite membranes for reverse osmosis desalination of aqueous solutions

Dong

Lee

2004

Journal of Colloid and Interface Science

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Development of Composite Adsorbents of Carbon and Intercalated Clay for N2and O2Adsorption: A Preliminary Study

Cited by 21 publications

References 25 publications

Engineering the Structures of Nanoporous Clays with Micelles of Alkyl Polyether Surfactants

Engineering the Structures of Nanoporous Clays with Micelles of Alkyl Polyether Surfactants

Aqueous and Gaseous Adsorption from Montmorillonite−Carbon Composites and from Derived Carbons

Preparation of α-alumina-supported mesoporous bentonite membranes for reverse osmosis desalination of aqueous solutions

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