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Issue 30, 2015
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A surface second harmonic generation investigation of volatile organic compound adsorption on a liquid mercury surface

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Abstract

Understanding the adsorption process of volatile organic compounds (VOCs) on various surfaces is essential in the realms of atmospheric, environmental and pollution remediation science. In this study, we investigated the adsorption of selected VOCs (benzene and toluene) on an ideally homogeneous liquid mercury (Hg(l)) surface using a surface sensitive nonlinear spectroscopic method of second harmonic generation (SHG). Both of the species investigated showed evidence of reversible physisorption. Determination of SHG adsorption isotherms revealed that attractive adsorbate–adsorbate lateral interaction plays a role in the adsorption of aromatic compounds from the gas phase. Benzene and toluene adsorption has been described by the Hill-de-Boer (HdB) adsorption isotherm model with the corresponding HdB interaction parameters, 2α/β, of 2.6 ± 0.2 and 3.3 ± 0.2 kcal mol−1, respectively. Our results highlight the importance of lateral interactions between adsorbed aromatic species at the gas/liquid interfaces. The investigation extends the applicability of SHG to probe complex adsorption processes under ambient conditions.

Graphical abstract: A surface second harmonic generation investigation of volatile organic compound adsorption on a liquid mercury surface

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Publication details

The article was received on 31 Oct 2014, accepted on 23 Feb 2015 and first published on 25 Feb 2015


Article type: Paper
DOI: 10.1039/C4RA13560A
Citation: RSC Adv., 2015,5, 23464-23470
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    A surface second harmonic generation investigation of volatile organic compound adsorption on a liquid mercury surface

    M. Subir, N. Eltouny and P. A. Ariya, RSC Adv., 2015, 5, 23464
    DOI: 10.1039/C4RA13560A

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