Thermally Induced Phase Transformation of Ni-Exchanged LTA Zeolite as an Alternative Route of Obtaining Stable Ni-Spinel Pigment
Miomir Krsmanović, Aleksandar Popović, Smilja Marković, Bojana Milićević, Dušan Bučevac, Marjetka Savić, Mia Omerašević
TL;DR
This study shows how heating nickel-exchanged LTA zeolite creates stable blue pigments, offering a sustainable method for ceramic pigment production.
Contribution
A novel dual-purpose method for nickel immobilization and pigment synthesis using thermally induced phase transformation of Ni-LTA zeolite.
Findings
Ni-exchanged LTA zeolite transforms into NiAl2O4 spinel at 900–1300 °C, confirmed by XRPD and FTIR.
Pigment color intensifies with higher temperatures, reaching over 99% crystalline phase at 1300 °C.
SEM analysis shows morphological changes to sintered agglomerates, improving pigment stability and hardness.
Abstract
This study investigates the thermally induced phase transformation of Ni-exchanged LTA zeolite as a dual-purpose method for nickel immobilization and the synthesis of stable ceramic pigments. The process describes a cost-effective and sustainable alternative to conventional pigment production, aligning with circular economy principles. Upon thermal treatment at temperatures ranging between 900 °C and 1300 °C, Ni-exchanged LTA zeolite undergoes a transformation to NiAl2O4 spinel, confirmed by XRPD, FTIR, and thermal analysis. Initially, NiO is formed, but as the temperature increases, it dissolves and transforms into NiAl2O4. Colorimetric studies revealed intensified blue pigmentation with increasing temperature, correlating with crystallite growth and structural evolution. SEM analysis showed morphological changes from cubic particles to sintered agglomerates, enhancing pigment…
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Taxonomy
TopicsPigment Synthesis and Properties · Advanced Photocatalysis Techniques · TiO2 Photocatalysis and Solar Cells