Journal
DYES AND PIGMENTS
Volume 148, Issue -, Pages 319-328Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2017.09.025
Keywords
Residue; Orange-red pigments; Iron; Environmentally friendly
Funding
- CAPES
- CNPq
- Fundacao Araucaria
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Alternative orange to dark red pigments were produced by purifying scum ashes from anaerobic treatment of domestic sewage. Scum samples collected a year apart were thermally treated at 650 degrees C/5 h to produce ashes, and these materials were purified to obtain intense colors, thermal stability, and reproducibility. Three different temperatures were used to calcinate the pigments. At 950 degrees C, the pigments achieved an intense orange color, which then became reddish and dark when the temperature was increased as a result of particle growth. All the samples presented the same crystalline phases, which is an important result that indicates reproducibility. These phases were identified by using Mossbauer spectroscopy, which revealed that the iron signature is mainly hematite (approximately 72%), and Fe2+ is probably related to the substitution of Ca2+ in the CaAl9(PO4)(7) phase. All the pigments presented good properties when used in ceramic enameling, but the samples produced at 1100 degrees C did not present a suitable size for application in polymer and paint. The samples produced at 950 and 1000 degrees C are more versatile and have many potential applications as an interesting alternative for the pigment industry and residue recycling, which is a problem in sewage treatment plants nowadays. (C) 2017 Elsevier Ltd. All rights reserved.
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