Mass Transport of Dye Solutions through Porous Membrane Containing Tannic Acid/Fe³⁺ Selective Layer

Abstract:

Tannic acid (TA)–Fe3+ membranes have received recent attention due to their sustainable method of fabrication, high water flux and organic solutes rejection performance. In this paper, we present a description of the transport of aqueous solutions of dyes through these membranes using the transport parameters of the Spiegler–Kedem–Katchalsky (SKK) model. The reflection coefficient (σ) and solute permeability ((Formula presented.)) of the considered TA–Fe3+ membranes were estimated from the non-linear model equations to pbkp_redict the retention of solutes. The coefficients σ and (Formula presented.) depended on the porous medium and dye molecular size as well as the charge. The simulated rejections were in good agreement with the experimental findings. The model was further validated at low permeate fluxes as well as at various feed concentrations. Discrepancies between the observed and simulated data were observed at low fluxes and diluted feed solutions due to limitations of the SKK model. This work provides insights into the mass transport mechanism of dye solutions and allows the pbkp_rediction of dye rejection by the TFC membranes containing a TA–Fe3+ selective layer using an SKK model.

Año de publicación:

2022

Keywords:

• tannic acid–metal ion membranes
• Reflection coefficient
• metal polyphenol complex membranes
• dye retention
• Spiegler–Kedem model
• solute permeability

Fuente:

scopus