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-This work presents an experimental study of purification of a biogas by removal of its hydrogen sulphide (H 2 S) content. The H 2 S was removed by means of chemical absorption in an iron-chelated solution catalyzed by Fe/EDTA, which converts H 2 S into elemental sulphur (S). Preparation of the catalyst solution and the results of biogas component absorption in the catalyst solution (0.2 mol/L) are presented. These results are compared with those for physical absorption into pure water under similar conditions. Experimental results demonstrate that, under the same experimental conditions, a higher percentage of H 2 S can be removed in the catalytic solution than in water. In a continuous counter current using adequate flowrate phases contact at room temperature and low gas pressure, the results demonstrate that is possible to totally remove the H 2 S from the biogas with the prepared catalytic solution.

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Highlights CA/CPB nanofibers have a filtration efficiency of 99.9 % for aerosol (7−300 nm). The Ergun’s porosity of the nanofibers is 98 % and the permeability about 10 −11 m 2 . CA/CPB nanofibers are biodegradable and sustainable novel air filters. The nanofibers are able to retention environmental PM 2.5 , BC and also virus.

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