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Structural changes in polyethylene terephthalate (PET) wastes materials caused by pyrolysis and CO2 activation

AutorParra Soto, José Bernardo ; Ovín Ania, María Concepción ; Arenillas de la Puente, Ana ; Rubiera González, Fernando ; Pis Martínez, José Juan ; Palacios, José María
Palabras claveWaste treatment
Activated Carbon
Heterogeneous catalysis
Ethylene terephthalate polymer
Carbon dioxide
Fecha de publicaciónjun-2006
EditorMulti Science Publishing
CitaciónAdsorption Science and Technology 24(5): 439-449 (2006)
ResumenFor ecological reasons, there is an increasing demand for recycling polyethylene terephthalate (PET) wastes in developed countries. Although one potential application might be its utilisation for the production of activated carbons, the behaviour of these wastes when subjected to different heat treatments and activation processes is still not very well known.
In the present work, samples with different degrees of burn-off were prepared by pyrolysis in an inert atmosphere and subsequent CO2 activation at high temperatures. The derived changes in the textural and structural properties of the residual solids were studied by helium picnometry, N2 and CO2 adsorption isotherms, powder XRD, Raman spectroscopy and XPS. The study reveals that CO2 activation of PET wastes develops a carbonaceous matrix with micropores. Helium measurements showed that the mass density of the activated samples increased as the degree of burn-off increased. Characterisation studies revealed that the structural changes derived from pyrolysis and further CO2 activation mostly involved a progressive decrease in the number of structural units.
Descripción11 pages.
Versión del editorhttp://dx.doi.org/10.1260/026361706779849735
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