| Title |
Artificial colouration of smectite through adsorbing dyes from wastewater to make a hybrid pigment |
| ID_Doc |
29729 |
| Authors |
Rodrigues, IA; Anaissi, FJ |
| Title |
Artificial colouration of smectite through adsorbing dyes from wastewater to make a hybrid pigment |
| Year |
2022 |
| Published |
Clay Minerals, 57.0, 3-4 |
| DOI |
10.1180/clm.2022.34 |
| Abstract |
Artificially coloured smectites (smectite pigments) were prepared via the sorption of anionic dyes on smectite saturated with ferric ions (Fe-smectite). Fe-smectite has a surface charge and is capable of decolourizing aqueous solutions containing single-component anionic dyes (Amaranth, Brilliant blue FCF and Tartrazine) or multi-component dyes (dye mixtures). Kinetic and equilibrium models were used to describe the sorption of individual dyes, whereas the decolourization of the multi-component system was studied by monitoring the reduction in the intensity of the absorption bands in the visible light region. The Langmuir-Freundlich dual-site model presented the best fit to the experimental data, and the sorption kinetics followed the pseudo-second order model. The smectite pigments were dispersed in colourless paint (10%, w/w), acting as organic-inorganic hybrid pigments. Colorimetric measurements of the powdered smectite pigments dispersed in colourless real-estate paint showed chemical compatibility without the need for solvents as dispersants. These properties allow the application of coloured smectites as pigments in a sustainable circular economy. |
| Author Keywords |
anionic dye; colourless paint; hybrid pigment; sorption; wastewater treatment |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000918174200001 |
| WoS Category |
Chemistry, Physical; Geosciences, Multidisciplinary; Mineralogy |
| Research Area |
Chemistry; Geology; Mineralogy |
| PDF |
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