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Low-temperature regeneration of activated carbon

II. Kinetic evaluation of consecutive o-NO2-phenol thermodesorptions

Journal of Thermal Analysis and Calorimetry
G. Baldassarre
V. Amicarelli

Activated granular carbon samples, routinely equilibrated with synthetic aqueous solutions of o-NO2-phenol, were regenerated by heating up to 500 °C in a dynamic N2 atmosphere. Kinetic evaluation of five subsequent thermodesorption cycles was accomplished by two different non-isothermal computation methods. Quantitative estimation of adsorbent-adsorbate interactions was carried out by means of the thermal coefficient of the massive adsorbate release.

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Granular activated carbon loaded with aniline,o-nitroaniline oro-nitrophenol, regenerated at relatively low temperature (450° in N2 atmosphere), shows losses of cyclic adsorption performances (about 5 % per cycle) comparable to those occurring with standard thermal regeneration (950° in controlled atmosphere). Adsorbate build-ups and related surface modifications have been determined.

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