New organic dye/anionic clay hybrid pigments: Preparation, optical properties and structural stability

• Published in: Dyes and pigments Vol. 162; pp. 998 - 1004
• Main Authors: Moujahid, El M., Lahkale, R., Ouassif, H., Bouragba, F.Z., Elhatimi, W.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2019
• Subjects: Acid green 25; Acid orange 6; Acid yellow 50; Anionic dye; Hybrid materials; LDHs; LDHs; Anionic dye; Hybrid materials; Acid yellow 50; Acid green 25; Acid orange 6
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2018.11.021

Encapsulation and subsequent stabilization of organic dye into layered double hydroxides (LDHs) are investigated. Three commercialized dye molecules such as: acid orange 6, acid yellow 50 and acid green 25, were intercalated in Zn2-Al-LDH by co-precipitation method, analyzed by ICP and UV–Visible, and characterized by XRD at different temperatures. Functionalized organic molecules have been interleaved for the synthesized hybrid LDH materials. It is shown that the effect of encapsulation is revealed by the different interactions according to the molecule size and stacking of dye molecules. Thermal behavior of hybrid materials showed a clear enhancement of the structural stability in temperature over the chloride-Zn2Al LDH, indicating that the assembly may appear as a mutual benefit. •Three hybrid materials were synthesized by intercalation in Zn2Al-LDH of Direct Yellow 50, Acid Green 25 and Acid Orange 6.•The UV–visible spectra were found dependent on the nature and structure of the dye.•The presence of the dye in the LDH interlamellar space stabilized thermally the LDH and dye molecule.