Adsorption applications of unmodified geothermal silica

Authors: Svavarsson HG (1) , Einarsson S (2) , Brynjólfsdóttir A
(1) Reykjavik University (2) KeyNatura ehf.
Source: Geothermics 50:30–34 · April 2014
DOI: 10.1016/j.geothermics.2013.08.001 Publication date: 2014 Apr E-Publication date: Not specified Availability: full text Copyright: Not specified
Language: English Countries: Iceland Location: Svartsengi Correspondence address: Not specified


Article abstract

Silica, precipitated out of geothermal fluid discharged from a geothermal powerplant in Svartsengi on the Reykjanes peninsula in Iceland, was used as a chromatographic adsorbent to extract blue colored protein, C-phycocyanin, from coccoid blue-green algae. The only supplement used was salt obtained by evaporating the geothermal fluid. Analysis of the silica, using scanning electron microscopy, X-ray diffractometry and Brunauer–Emmett–Teller (BET) adsorption confirmed it has a high specific surface area and is amorphous. Upon adsorption and subsequent elution the purity of the extracted protein, measured as the ratio of the light absorbance of 620 and 280 nm, increased from 0.5 to above 2.0. Our results could facilitate utilization of a mostly unused byproduct of geothermal powerplants as chromatographic material.

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