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Surface properties of recycled titanium oxide recovered from paint waste

Journal article
Authors Mikael C.F. Karlsson
Zareen Abbas
Romain Bordes
Yu Cao
Anders Larsson
Antonin Rolland
Phil Taylor
Britt Marie Steenari
Published in Progress in Organic Coatings
Volume 125
Pages 279-286
ISSN 0300-9440
Publication year 2018
Published at Department of Chemistry and Molecular Biology
Pages 279-286
Language en
Links https://doi.org/10.1016/j.porgcoat....
Keywords Paint, Pigment, Recycling, Surface charge, Titanium oxide, Zeta potential
Subject categories Surface and colloid chemistry, Inorganic Chemistry, Chemistry

Abstract

© 2018 Elsevier B.V. Aluminium oxide coated rutile pigment was extracted from a paint matrix by means of a thermal recycling process. The objective was to investigate the effect of the recycling process on the surface properties of the pigment. The pigment was analysed using powder x-ray diffraction (XRD), surface area measurements (BET), laser diffraction for particle size analysis and X-ray photoelectron spectroscopy (XPS) before and after the recycling process. Investigations on the zeta potential and the surface charge were performed as well. It was concluded that the rutile crystalline core and the aluminium oxide coating of the pigment were still intact after the recycling process. The particle size distribution of the recycled pigment was slightly broader compared to the virgin pigment. The measured magnitude in zeta potential of the recycled pigment was lower than for the virgin pigment. This difference is thought to be caused by alteration in the surface hydroxyl concentration. Surface charge titrations showed differences between the virgin and the recycled pigment at alkaline pH and at low salt concentrations.

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