Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/101338
Title: Separation of PET from other plastics by flotation combined with alkaline pretreatment
Authors: Pita, Fernando 
Castilho, Ana 
Keywords: alkaline treatment; flotation; particle size; plastic
Issue Date: 2020
Project: UID/Multi/00073/2013 of the Geosciences Center of the University of Coimbra 
Serial title, monograph or event: Polimeros
Volume: 30
Issue: 3
Abstract: Plastics are naturally hydrophobic, so the selective flotation of plastic mixtures is impossible without changing their surface properties. The objective of this research is flotation separation of PET from PS, PMMA and PVC combined with sodium hydroxide pretreatment. NaOH pretreatment had a strong effect on PET’s floatability, medium effect on PMMA and PVC and limited effect on PS. The reduction of PET floatability is ascribed to a sharp decline of contact angle. The optimal pretreatment conditions were: 10% NaOH concentration, 70 °C (PET/PMMA and PET/PVC) to 80 °C (PET/PS) and plastic treatment times in the alkaline solution of 20 min (PET/PMMA and PET/PVC) to 30 min (PET/PS). Flotation separations were achieved efficiently and the best results were obtained for the PET/PS mixture, with a floated PS grade of 98% and a sunk PET grade of 100%. PET and PS was separated effectively, implying that sodium hydroxide treatment possesses superior applicability.
URI: https://hdl.handle.net/10316/101338
ISSN: 1678-5169
0104-1428
DOI: 10.1590/0104-1428.03320
Rights: openAccess
Appears in Collections:I&D CGUC - Artigos em Revistas Internacionais

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