RESEARCH ARTICLE


Post-Consumer Polyolefins (PP-PE) Recognition by Combined Spectroscopic Sensing Techniques



S. Serranti*, G. Bonifazi
2 Department of Chemical Engineering Materials & Environment, Sapienza University of Rome, Via Eudossiana 18, 00184, Rome, Italy


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© 2010 Serranti and Bonifazi.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Sapienza – Università di Roma, DICMA, Via Eudossiana n. 18, 00184 Rome, Italy; Tel: +39 06 44585 360; Fax: +39 06 44585 618; E-mail: silvia.serranti@uniroma1.it


Abstract

The efficient large-scale recycling of plastic waste is of increasing interest from an ecological and economic point of view, but it represents a goal that has yet to be achieved by the recycling industry. The possibility offered by different spectroscopic sensing techniques in order to identify different plastic particles to be recycled, with particular reference to polyolefins from complex wastes, has been investigated. Representative samples of polyolefins (polyethylene and polypropylene) have been collected and analyzed for laboratory set-up and testing by FT-IR spectroscopy, by Raman spectroscopy and by hyperspectral imaging in two different wavelength fields, 400-1000 and 1000-1700 nm, respectively. The spectral signature obtained by the different techniques of the two plastic typologies have been detected, analysed and compared. The main parameters that allow to perform the recognition of the polyethylene (PE) and polypropylene (PP) have been defined, with particular reference to the hyperspectral imaging innovative technique. The analytical strategies can be utilised to define sorting and/or control logics to be applied in “on-line” control architectures to directly act at industrial plant level.

Keywords: Recycling, secondary plastics, polyolefins, hyperspectral imaging, FT-IR spectroscopy, Raman spectroscopy, sorting.