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Journal of applied research and technology

On-line version ISSN 2448-6736Print version ISSN 1665-6423

Abstract

ROA, K.; TREJO, F.  and  CASTRO, H.. Application of porous geopolymer composite 1 based on metakaolin and activated 2 carbon for removal of Hg2+ from aqueous solution. J. appl. res. technol [online]. 2023, vol.21, n.5, pp.796-807.  Epub Aug 23, 2024. ISSN 2448-6736.  https://doi.org/10.22201/icat.24486736e.2023.21.5.1702.

This paper reviews the application of a geopolymer composite using an easy synthesis route based on the activation of metakaolin (MK) as aluminosilicate source and activated carbon (AC) as a porous agent, to improve porosity and adsorption capacity. The main goal of this study is to evaluate the ability of the obtained geopolymer to remove Hg2+ from aqueous solutions, for comparison purposes a geopolymer sample was fully synthesized with metakaolin aluminosilicates. The samples were investigated by X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FTIR), compressive strength tests, and scanning electron microscopy (SEM). Hg2+ removal from aqueous solutions was quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES). The pH of the solution significantly affects the adsorption of Hg2+ ions onto the geopolymer surface. The maximum removal efficiency of the composite was 87.6 % at room temperature and pH 5. These results suggest the use of a geopolymer with activated carbon as a successful alternative adsorbent for Hg2+ ions in water.

Keywords : Geopolymer; activated carbon; alkali activation; mercury; adsorption.

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