Transport phenomena of C.I. Direct Red 2 into water-swollen cellulose membranes have been studied at 55 °C. We reasoned that the dye has a high affinity on cellulose. The transport phenomena were analyzed on the basis of a parallel transport theory of surface and pore diffusion. The transport of the dye into a cellulose membrane was characterized and factors that affect the pore diffusivity of the parallel diffusion model were considered by comparing stimulated data.
Maekawa, M., Kasai, K., & Nango, M. (1998). Transport phenomena of sulfonated dyes into cellulose membranes: Parallel diffusion of a sulfonated dye with a high affinity onto cellulose. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 132(2–3), 173–179. https://doi.org/10.1016/S0927-7757(97)00196-9