Kinetics and Thermodynamics Studies of Prodigiosin Dyeing on Polyester

Prodigiosin is a natural pigment which has antimicrobial activity and produced by a microorganism, but it is insoluble in water, thereby limiting their application in textile dyeing. With the study of the Prodigiosin’s kinetics and thermodynamics on PET, the feasibility of using Prodigiosin as disperse dyes was discussed. The thermodynamics results show that the up-take of Prodigiosin in PET fiber is linear to the dye bath concentration, with increasing temperature, the distribution coefficient decreases and the thermodynamic affinity of the dye has little gown up, the enthalpy and entropy of dyeing were -2.51[kJ/mol] and 5.05[J/(mol·K)] respectively, which show that PET dyeing with prodigiosin is a exothermic process and the diffusion coefficient increases with the temperature rise. The activation energy calculated with the Arrhenius equation is 6.09 [kcal /mol].