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Elucidating the Sorption Mechanism of Dibromomethane in Disordered Mesoporous Silica Adsorbents.

Stoeckel D, Wallacher D, Zickler GA, Thommes M, Smarsly BM (2015)

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Publication Type: Journal article, Original article

Subtype: other

Publication year: 2015

Journal

Publisher: American Chemical Society

Book Volume: 31

Pages Range: 6332-6342-6342

Journal Issue: 23

DOI: 10.1021/acs.langmuir.5b00705

Abstract

The mechanism of dibromomethane (DBM) sorption in mesoporous silica was investigated by in situ small-angle X-ray scattering (SAXS). Six different samples of com. porous silica particles used for liq. chromatog. were studied, featuring a disordered mesoporous structure, with some of the samples being functionalized with alkyl chains. SAXS curves were recorded at room temp. at various relative pressures P/P0 during adsorption of DBM. The in situ SAXS expt. is based on contrast matching between silica and condensed DBM with regard to X-ray scattering. One alkyl-modified silica sample was evaluated in detail by extn. of the chord-length distribution (CLD) from SAXS data obtained for several P/P0. On the basis of this anal. approach and by comparison with ex situ obtained data of nitrogen and DBM adsorption, the mechanism of DBM uptake was studied. Results of av. mesopore sizes obtained with the CLD method were compared with pore size anal. using nitrogen physisorption (77 K) with advanced state-of-the-art nonlocal d. functional theory (NLDFT) evaluation. The dual SAXS/physisorption study indicates that microporosity is negligible in all silica samples and that surface functionalization with a hydrophobic ligand has a major influence upon the process of DBM adsorption. Also, all of the mesopores are accessible as evidenced by in situ SAXS. The data suggest that no multilayer adsorption occurs on C18-(octadecyl-)modified silica surfaces using DBM as adsorptive, and it is possibly also negligible on bare silica surfaces. [on SciFinder(R)]

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How to cite

APA:

Stoeckel, D., Wallacher, D., Zickler, G.A., Thommes, M., & Smarsly, B.M. (2015). Elucidating the Sorption Mechanism of Dibromomethane in Disordered Mesoporous Silica Adsorbents. Langmuir, 31(23), 6332-6342-6342. https://dx.doi.org/10.1021/acs.langmuir.5b00705

MLA:

Stoeckel, Daniela, et al. "Elucidating the Sorption Mechanism of Dibromomethane in Disordered Mesoporous Silica Adsorbents." Langmuir 31.23 (2015): 6332-6342-6342.

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