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6th International Academic Conference on Chemistry and Chemical Engineering Vennue: Hotel Istana Kuala Lumpur City Centre 73 Jalan Raja Chulan, Kuala Lumpur, 50200, Malaysia Date: 08-Sep-2018 More Details
7th International Academic Conference on Chemistry and Chemical Engineering Vennue: Hotel Istana Kuala Lumpur City Centre 73 Jalan Raja Chulan, Kuala Lumpur, 50200, Malaysia Date: 29-Dec-2018 More Details
The interactions of anionic dye, Mordant Red7 with two different cationic ligands (ethanol amine and tallow amine) were studied in acidic aqueous solution using UV–VIS absorption spectroscopy. The dye interacts strongly with oppositely charged ligands. The results have shown that the maximum absorbance of the dye decreased gradually after addition of opposite charge ligand, and also shows the emergence a new absorption band. The new peak was attributed to the formation of dye aggregation by intermolecular forces such as hydrophobic forces attraction, Van der Waals forces and hydrogen bonds. The binding constant (Kc) values of the dye to cationic ligands have been determined by means of Benesi–Hildebrand equation. The magnitude of Kc is large for tallow amine 43.05 x 103mol-1 L compared to ethanol amine 1.245 mol-1 L. This is because; tallow amine able to self-assemble into micelles (surfactant) at a specific concentration called the critical micelle concentration (CMC), thereby, the dye binding to micelle of tallow amine surfactant. On the other hand “ethanol amine does not form micelles”. The standard free energy change ΔG◦ for ethanol amine and tallow amine for the complexation process have also been determined.
The interactions between dyes and ligands are an important in many industrial applications such as detergency, emulsion polymerization, enhanced oil recovery, drug delivery and textile dyeing and subjects of numerous investigations. The purpose is to define physical interactions and focusing on the influence of ligand structure on aggregation of dyes. However, until more recently, an understanding of the nature of molecular interactions between dyes in solution lacked much clarity. The main objective of this project was to study the effects of chemical structure and concentration of ligand (surfactant) on the solubilization and aggregation of dyes in aqueous solution. For this reason, the interactions of anionic Mordant Red7 with two different cationic solutions were investigated spectrophotometrically and optimization conditions of aggregations and calculate the binding constant and standard free energy.
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