A novel method for the clean synthesis of nano-sized cobalt based blue pigments
| Autor: | Sh. Salem, K. Mokhtari |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
General Chemical Engineering Inorganic chemistry Oxide chemistry.chemical_element 02 engineering and technology Zinc engineering.material 010402 general chemistry 01 natural sciences law.invention chemistry.chemical_compound Pigment law Calcination Fourier transform infrared spectroscopy Magnesium Spinel General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry visual_art visual_art.visual_art_medium engineering 0210 nano-technology Cobalt |
| Zdroj: | RSC Advances. 7:29899-29908 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c7ra03771f |
| Popis: | Cobalt based pigments are categorized as hazardous materials because they contain a high level of environmentally toxic metals. Therefore, the aim of the present investigation is to partially replace cobalt by magnesium and zinc. The powder compositions are prepared according to the statistical mixture design methodology and Co1−(x+y)MgxZnyAl2O4 is synthesized via sol–gel self-combustion in which glycine is employed as the fuel because it produces nontoxic gases. This study considers a wide range of synthetic factors, including composition (x + y ≤ 0.50), calcination temperature (900–1000 °C) and pH (2.5–10.5). The products are characterized via Fourier transform infrared spectroscopy, X-ray diffraction, Brunauer–Emmett–Teller surface area measurement, and scanning and transmission electron microscopy. The Co0.75Zn0.25Al2O4 and Co0.67Mg0.16Zn0.16Al2O4 pigments have a bright blue color and are approximately identical to the reference composition (CoAl2O4) when synthesized under the neutral conditions. The colorimetric data indicated the formation of blue pigment, corresponding to highly negative b* value, ∼−30, for the Co0.67Mg0.16Zn0.16Al2O4 composition prepared in the acidic condition. A safe and reliable synthetic method was introduced for the synthesis of nano-sized spinel ≤30 nm by the substitution of magnesium and zinc for cobalt in the structure of the pigment. In comparison to cobalt aluminate oxide, the modified composition, which contains 33.33 mol% magnesium and zinc, can effectively improve chromatic performance, reduce environmental risk and be employed for the economic production of nano-sized pigments. |
| Databáze: | OpenAIRE |
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