Abstract
A sample of phonolite was treated by cold plasma and hydrochloric acid diluted in water to study the change of its structure and acid properties. The phonolite and treated samples were analysed by XRD, elemental analysis XRF, specific surface area BET, TPD-NH3 and FT-IR spectroscopy. They were also tested in the adsorption of Ca, K, Mg, P and Na impurities present in waste cooking oil. Plasma treated sample presented almost the same structure with some surface differences respect to the original phonolite. However, acid treated sample presented bigger total surface compared to the other samples, different structure, composition and acid properties.
Highlights
Phonolite is an igneous rock formed composed mainly by alkali feldspar and other compounds.[1]
The acid treatment implied an increment in the total porosity as consequence of the removing of Al, Na and K
Acid treatment supposed an increment in the total porosity
Summary
Phonolite is an igneous rock formed composed mainly by alkali feldspar and other compounds.[1]. Some experiments were carried out with the aim of studying the structure modifications of new solids obtained at high temperature and pressure.[2,3,4,5] Acid treatment of solids has been extensively studied for many applications such as catalysis, agriculture, membranes, etc This treatment could be an effective tool to modify the structure and composition of the phonolite.[1] Acid treatment could be an advantage increasing the porosity of the material for using it as adsorbent or catalyst as described for other type of materials.[6] it could be a disadvantage as K+ donor material for being used as fertilizer.[7] no previous publications were found about the acid treatment effects on phonolite structure. The aim of this work was to study the modification of the phonolite by using two separate processes (surface modification by cold plasma and structure change by acid treatment)
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