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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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Abstract  

Use of autoradiography and scanning electron microscopy, coupled with potentiometric and radionalytical investigation techniques, allows to confirm experimentally that the rate of Cl→SO 4 2− conversion of different anion resins at 0.006N solution concentration is not controlled) by ion interdiffusion and that sulfate penetration into the resin bead occurs according to a progressive conversion mechanism.

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Journal of Thermal Analysis and Calorimetry
Authors:
V. Drebushchak
,
G. Intini
,
L. Liberti
,
M. Notarnicola
,
T. Pastore
,
T. Drebushchak
, and
V. Boldyrev

Abstract  

Natural dredged sediments contaminated by PCBs from the heavy industrialized harbor of Taranto (S. Italy) on the Ionian Sea, previously dechlorinated by mechanical activation in different ball mills (SPEX and AGO-2), together with synthetic mixtures emulating the contaminated sediments, were submitted to thermogravimetric and calorimetric measurements as well as to X-ray powder diffraction in order to clarify the dechlorination reaction mechanism. Both major sediment components, i.e., carbonates and clay minerals, were found to be affected by the mechanical activation. As trace pollutants like PCBs are concentrated in clays, the mechanical activation of sediments increases the release of pollutants yielding a more active decontamination. DSC results were less informative as calorimetric peaks from different thermal events were found to overlap.

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