Precipitated Silica from Pumice and Carbon Dioxide Gas (Co₂) in Bubble Column Reactor

Abstract

Abstract. Precipitated silica from silica and carbon dioxide gas has been studied successfully. The source of silica was obtained from pumice stone while precipitation process was carried out with carbon dioxide gas (CO 2 ). The sodium silicate solution was obtained by extracting the silica from pumice stone with sodium hydroxide (NaOH) solution and heated to 100 °C for 1 h. The carbon dioxide gas is injected into the aqueous solution of sodium silicate in a bubble column reactor to form precipitated silica. m 2 /g. The results indicate that the products obtained are precipitate silica have surface area in the range of 100 -227 m 2 /g, silica concentration more than 80%, white in appearance, and silica concentration reached 90% at pH 7.

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“…Precipitated silica or silica gel is produced by the polymerization of water-soluble silicate salts in the presence of mineral acids, resulting in a precipitate or gel 7 . Similarly, zeolites are crystallized from a precursor gel in hydrothermal conditions 8 .…”

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“…Overall, the extraction of precipitated silica starts with the combustion of the plant material to obtain ash, and this is dispersed in sodium hydroxide to obtain silicate solution, before being acidified with a mineral acid (i.e., sulfuric acid) (Hsieh et al 2009). Precipitation is carried out under alkaline conditions; the type of agitation, precipitation time, temperature, and pH can affect the properties of the silica (Kamath and Proctor 1998;Aujla et al 2007;Dewati et al 2018). The overall reaction is given in the following formula:…”