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Surface properties of recycled titanium oxide recovered from paint waste
Chalmers University of Technology, Sweden.
University of Gothenburg, Sweden.
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
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2018 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 125, p. 279-286Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2018. Vol. 125, p. 279-286
Keywords [en]
Paint, Pigment, Recycling, Surface charge, Titanium oxide, Zeta potential, Alkalinity, Alumina, Aluminum oxide, Oxide minerals, Particle size, Particle size analysis, Pigments, Protective coatings, Surface properties, Titanium dioxide, Titanium oxides, X ray photoelectron spectroscopy, Crystalline core, Laser diffractions, Low salt concentration, Powder X ray diffraction, Recycling process, Surface area measurement, Surface hydroxyl concentration, Thermal recycling
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-35578DOI: 10.1016/j.porgcoat.2018.09.012Scopus ID: 2-s2.0-85053358779OAI: oai:DiVA.org:ri-35578DiVA, id: diva2:1261229
Note

Funding details: P37547-1, VINNOVA; Funding text: The authors acknowledge thefinancial support from Swedish Governmental Agency for Innovation Systems (grant number: P37547-1 )

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2018-11-06Bibliographically approved

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