Journal
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
Volume 93, Issue 13, Pages 2718-2725Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S003602441913017X
Keywords
reactive yellow (RY); polyvinylpyrrolidone (PVP); binding constant (K-b); complexation; thermodynamic parameters
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The influence of polymer, polyvinylpyrrolidone (PVP) on spectral properties of anionic azo dye, reactive yellow (RY) was investigated by UV-Vis spectroscopy in the temperature range of 298-313 K. The change in lambda(max) and absorbance indicated the presence of interaction between anionic dyes and polymer. The binding constant (K-b) of complexation was determined from the Benesi-Hildebrand plot. The K-b value increased with increasing dye concentrations and decreased with the rise of the temperature. The values of Delta G degrees for RY-PVP complexation were found to be negative and these negative values reduce with the enhancement of temperature which indicates that the binding process is more spontaneous at lower temperature. The negative values of Delta S degrees and negative values of Delta H degrees refer a process which is always enthalpy dominated. K-b values showed significant change with the change of pH. The K-b value enhances with the rise of the carbon chain length of the alcohol and reduces with increasing percentages of alcohol. The K-b value decreases at higher electrolyte concentrations and also with the increase of the size of the anion of the electrolyte. The removal of dye from the waste water by the interaction of dye with polymer in the presence of surfactant and salt of higher concentration has also been studied.
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