Synthesis of Polymer Inclusion Membranes based on Cellulose Triacetate for Recovery of Lanthanum(III) from Aqueous Solutions

Abstract

Polymer inclusion membrane (PIM) containing cellulose triacetate (CTA) as a polymer matrix and 2-nitrophenyl octyl ether (NPOE) as a plasticizer was developed. This membrane also contained di(2-ethylhexyl)phosphoric acid (D2EHPA) and tributyl phosphate (TBP) as the carriers of metal ions. The facilitated transport of lanthanum(III) from aqueous nitrate(V) solutions across PIM was studied. It was observed that metal ions were transported from the source phase into 2M H2SO4 as the receiving phase. The transport through PIM with D2EHPA as the ion carrier was found as the more effective method of lanthanum(III) removal from the aqueous solution than transport through PIM with TBP as the ion carrier.

Application of Plasticized Cellulose Triacetate Membranes for Recovery and Separation of Cerium(III) and Lanthanum(III)

“…Transport measurements were carried out in the experimental rig described and presented in detail elsewhere [3][4][5][6]. The volumes of source and receiving phases were both equal to 100 cm 3 .…”

“…Transport measurements were carried out in the experimental rig described and presented in detail elsewhere [3][4][5][6]. The volumes of source and receiving phases were both equal to 100 cm 3 . During experiments, membrane samples with the effective membrane area of 12.56 cm 2 were used.…”

“…The membranes were prepared as described in detail elsewhere [3][4][5][6]. Solutions of CTA, the ion carrier (Cyanex 272, Cyanex 301), and the plasticizer (NPOE) in dichloromethane were prepared.…”

“…The classic methods of separation include: solvent extraction, ion exchange, crystallization, membrane methods, etc. Application of polymer inclusion membranes (PIMs) can be a useful method for concentration of aqueous solution containing metal ions as well as for their selective recovery [1][2][3]. Nowadays, PIMs are applied only on a small, laboratory scale since there is no industrial installation that is available for the application of PIMs.…”

“…The organophosphorus acids, amine-based compounds (quaternary ammonium and phosphonium salts and tertiary amines), and neutral or solvating extractants are used as the carriers for synthesis of PIM [1,2,[9][10][11][12]. The most important advantages of PIMs' application are their low cost of process and high selectivity [1][2][3][4][5][6]. On the other hand, the drawbacks of PIMs are their relatively low diffusion coeffi cient and long-lasting transport across membrane [1].…”