Abstract
Abstract Activated bio-carbons were developed from residues of supercritical extraction of raw plans such as: raspberries, blackcurrant, nettle and green tea. The physicochemical properties of the activated bio-carbons were characterized by low-temperature nitrogen sorption and Boehm titration. All materials were used for the adsorption of methylene blue and methyl red from liquid phase. The influence of different parameters such as initial concentration, contact time and pH of dyes solution on the effectiveness of organic dyes adsorption was evaluated. The possibility of using the Langmuir and Freundlich isotherm models for description of the character of the sorption processes was checked. The experimental data were found to be well described by the pseudo-second order model. All materials were also used for nitrogen dioxide adsorption form gas phase. The presence of steam in the stream of gases has a positive effect on adsorption of toxic gas by bio-sorbents obtained. The maximum sorption capacity of the activated bio-carbons towards methylene blue was 146 mg/gads, methyl red −103 mg/gads while that towards nitrogen dioxide was 81 mg/gads. The most effective adsorbent of organic and inorganic pollutants proved to be the activated bio-carbon obtained from the residues of supercritical extraction of raspberries.
Published Version
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