Enhancing colorant pigment properties of natural clinoptilolite zeolite through thermal treatment: Comprehensive structural, optical, and colorimetric analysis

This study investigates the transformation of metastable zeolites, specifically clinoptilolite zeolite (CLNP), into amorphous precursors for customized ceramics via ion-exchange and precipitation methods with Co and Zn ions, followed by thermal treatment in the temperature range of 700 ℃ to 1200 ℃....

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Bibliographic Details
Published in:Journal of alloys and compounds 2024-01, Vol.970, p.172503, Article 172503
Main Authors: Fatah, Salar K., Khajeh Aminian, Mohsen, Bahamirian, Milad
Format: Article
Language:English
Subjects:
Clinoptilolite zeolite
Colorant pigment
Mineral colorants
Thermal processing
Zeolite Modification
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Summary:This study investigates the transformation of metastable zeolites, specifically clinoptilolite zeolite (CLNP), into amorphous precursors for customized ceramics via ion-exchange and precipitation methods with Co and Zn ions, followed by thermal treatment in the temperature range of 700 ℃ to 1200 ℃. Analytical techniques including TGA/DTA, XRD, FE-SEM, UV-Vis, and Colorimetric analysis reveal that collapse into an amorphous CLNP phase occurs at 750–800 ℃, with subsequent thermal treatments reducing the CLNP phase's weight fraction. Notably, Co-willemite (Zn2−xCoxSiO4) recrystallization occurs at 800–900 ℃ without impurities. Morphological changes, agglomeration, increased particle distribution, and crystallite size growth correlate with rising temperatures. Different pigments emerge, such as brown (700 ℃), green (800 ℃), and blue (900 ℃), with stable Co-willemite persisting post-treatment, yielding high-quality blue pigments. This research highlights the potential for tailored ceramics via zeolite manipulation, offering stable and diverse pigment possibilities in the field. [Display omitted] •Investigated zeolite collapse at elevated temperatures, yielding amorphous ceramics precursors.•Utilized CLNP zeolite and Co/Zn ions for pigment creation via ion-exchange and thermal treatment.•Achieved a range of pigments within the 700–1200 ℃ calcination range.•Analyzed changes employing TGA, XRD, FE-SEM, UV-Vis, and Colorimetric methods.•At 750–800 ℃, collapse yielded amorphous CLNP; 800–900 ℃ formed Co-willemite with morphological shifts.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2023.172503