Sorption of Ponceau 4R anionic dye from aqueous solutions on aluminum oxide and polyurethane foam

Abstract

The sorption of Ponceau 4R (E-124) anionic dye on polyurethane foam based on ethers and γ-Al2O3 from aqueous solutions is studied. It is established that sorption is highest in the range of 0.5 M HCl, pH 2 on polyurethane foam and 0.2 M HCl, pH 6.5 on γ-Al2O3. Under optimum conditions, the degrees of recovery on polyurethane foam and γ-Al2O3 are 20–30 and 70–85%, respectively. A possible scheme of interactions between the dye and the surfaces of sorbents is proposed.