Some thermodynamic parameters of two indigenous mineral dyes applied on wool material Adebayo G.B.1,*, Adekola F.A.2, Olatunji G.A.2, Bello I.A.3 1Chemistry Department, Kwara State Polytechnic, Ilorin P.M.B. 1375, Ilorin, Nigeria 2Chemistry Department, University of Ilorin, P.M. B.-1515, Ilorin, Nigeria 3Chemistry Department, Ladoke Akintola University Technology, Ogbomoso, Nigeria *Author for Correspondence, E-mail: adebayochem@yahoo.com
Online published on 22 February, 2013. Abstract Some thermodynamic parameters governing the dyeing process of two potential indigenous mineral dyes applied on wool fabric have been investigated. These parameters included percent exhaustion (%E), partition coefficient (K), standard affinity (−Δ μ0), enthalpy change (ΔH0), entropy change (Δs0), diffusion coefficient (DT) and activation energy of the diffusion(ED). Relevant physicochemical properties such as solubility, melting point, pH, λmax and elemental analysis were also discussed. The range of values of %E, K, -Δ μ0, ΔH0, Δs0, DT, and ED obtained for the two dyes were: 92.8–98.7%, 20.5 to 73.1lkg−1 -1036.0 to -2626.0cal/mol, -14451 to 6043cal/mol, -15.42 to -48.88cal/molK 1.2–4.1x10−3 cm2/min and 3.75 4.03kcal/mol respectively. The implication of the values of each parameter on the dyeing of fabric materials were discussed and used to predict some important properties of the two dyes. Top Keywords Mineral dye, exhaustion, wool, Standard affinity, Enthalpy, Entropy, Partition coefficient, diffusion coefficient, activation energy. Top |