Surface Properties of Magnesium-Aluminium Hydrotalcite-Like Compound Characterized by Inverse Gas Chromatography

Abstract:

In this paper, the Mg-Al hydrotalcite-like compound (Mg-Al-HTLC) was synthesized by hydrothermal method at 373K. Structure and morphology of Mg-Al-HTLC was obtained with X-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infra-red spectroscopy(FTIR). A series of polar and non-polar molecules were used for probes, surface properties of Mg-Al-HTLC was studied by inverse gas chromatography (IGC) at 353K, 363K, 373K, 383K respectively. The retention volume was utilized for evaluating the free energy of adsorption (-ΔG^SP), the dispersive component of the surface energy(γ_s^D), as well as the enthalpy and entropic component(ΔH^SP, -ΔS^SP). XRD results reveal that the Mg-Al-HTLC has high crystallinity and perfect layered structure. The results of IGC show that Mg-Al-HTLC would adsorb straight-chain alkanes spontaneously, and the values of γ_s^D were similar at all temperature. It reveals Mg-Al-HTLC is a material with particular characteristics of both acid and base. This study illustrates that, as a method to evaluate the surface properties of material , IGC method is dependable and significant.

• Periodical: Advanced Materials Research (Volume 1152)
• Pages: 1-8
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1152.1
• Online since: April 2019
• Authors: Liang Qin Zhou*, Dong Yuan, Xing Wen Zheng, Jin Long Fan, Cheng Qian
• Keywords: Enthalpy, Entropic, Free Energy of Adsorption, Inverse Gas Chromatography (IGC), Magnesium-Aluminium Hydrotalcite-Like Compound (Mg-Al-HTLC), Surface Property

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