Abstract
The changes of pore structure and adsorption properties of a bentonite from Serbia after treatment with different concentration of HCl solutions (0.5–4 M) were investigated. The pore size distribution, specific surface area and C constant according to BET method, Dubinin-Radushkevich plots, V a− t plots and f plots were determined by nitrogen adsorption measurements. The results showed that with the increase of concentration of acid solution the total pore volume increased, while the maximum value of specific surface area was attained by the sample treated with 2 M HCl. Changes observed after treatment with 0.5 to 2 M HCl were caused by cation exchange and removal of impurities from bentonite. Differences of pore structure and adsorption properties after treatment with 2 to 4 M HCl were caused by structural changes and partial decomposition of the samples. The results suggest that chemical treatment of the bentonite with 2 M HCl produced an adsorbent with optimal porosity and other adsorption properties.
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