WSEAS Transactions on Environment and Development
Print ISSN: 1790-5079, E-ISSN: 2224-3496
Volume 21, 2025
Synthesis of Ceramic Pigments from the System $$Al_{2}O_{3}$$ - $$SiO_{2}$$ by Utilization of Rice Husk Ash as Silica Source
Authors: , , , , ,
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Abstract: In this work, the synthesis of ceramic pigments from the system $$Al_{2}O_{3}$$ - $$SiO_{2}$$ by utilization of rice husk ash (RHA) as a silica source is considered. For comparison, pigments from pure raw materials were also synthesized. All compositions were synthesized at 1450°С. The amount of chromophore in the compositions was 5%. Co, Cu, and Ni were used as chromophore elements, introduced respectively as $$Co_{2}O_{3}$$, CuO, or NiO. The pigments were studied by several methods - XRD, FT-IR, EPR, and spectral colour determination. By X-ray diffraction, a qualitative and quantitative analysis of the synthesized pigments was made. The colour characteristics are determined spectrally by a tintometer of Lovibond Tintometer RT 100 Color. The pigments with cobalt chromophore have the best indicators, in which (b) = - 24.1 when using SiO2.nH2O and (b) = -27.4 when using RHA. The possibility of replacing pure silica with one obtained from oxidized rice husks was proven.
Keywords:
ceramic pigments, solid-phase sintering, waste raw materials, rice husk ash, chromophore ions, color determination
Pages: 1001-1009
DOI: 10.37394/232015.2025.21.83