Abstract
Acoustic emission analysis applied for the characterization of granular activated carbons (GAC) has been barely explored. The porosity of regenerated GAC used in rum production has been assessed using the acoustic emission method based on the signal envelope analysis by band-pass filtering at 1.3 kHz of the sound produced by water flooding the activated carbon. Acoustic measurements have been correlated with porosity and surface area analysis applying argon at 87K and N2 at 77K. The found relationship proves not only the almost equivalency but also the partly complementarity of both techniques and the possibility to determine the regeneration degree of GAC using the acoustic emission method.
Highlights
Activated Carbon (AC) adsorption is a common technique for eliminating various impurities in gas and liquid phase
This paper gives an improved approach of earlier findings [11,12,13], describing a new method for the characterization of activated carbons based on acoustic emission analysis
Three of them were pre-treated by ammonia solution at 6.25 wt % before thermal regeneration in order to extract adsorbed compounds based on the reaction between ammonia and exhausted granular activated carbon (GAC) [31,32]
Summary
Activated Carbon (AC) adsorption is a common technique for eliminating various impurities in gas and liquid phase. This paper gives an improved approach of earlier findings [11,12,13], describing a new method for the characterization of activated carbons based on acoustic emission analysis It results in a typical sound (acoustic) emission by bubbles moving through the bulk water and exploding at the liquid surface. A comparison between the use of volumetric gas sorption and its deduced apparent BET surface area applying different gases and the acoustic emission technique is discussed in order to determine the porous characteristics of regenerated GAC under different conditions. The volumetric sorption techniques and its deduced apparent BET surface area confirmed the strength of the acoustic characterization method
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