Ricoux Q.,Montpellier University |
Bocokic V.,Magpie Polymers |
Mericq J.P.,Montpellier University |
Bouyer D.,Montpellier University |
And 2 more authors.
Chemical Engineering Journal | Year: 2015
A new polymeric sorbent powder (MP-102) containing phosphine oxide groups was developed for the selective recovery of palladium by sorption from acidic effluents containing base metals such as nickel and copper. Experiments show an interesting affinity of MP-102 to palladium species with sorption capacity up to 1mmolg-1 at pH 2, fast kinetics and up to 96% selectivity for Pd in presence of Cu and Ni at pH 1. It was found that 99% of the sorbed palladium can be stripped by elution with an acidified solution of thiourea. The influence of various operating parameters (pH, chloride concentrations and temperature) on Pd sorption equilibria was studied in presence of copper and nickel in order to investigate their influence on the sorption selectivity of the palladium species and to investigate the metal binding mechanisms. Experiments, supported by DFT calculations, suggest a coordination of Pd and Ni by the phosphine oxide groups, preferably in a bidentate mode (chelation), whereas Cu appears to bind to both amine and phosphine oxide groups. The sorption selectivity for palladium is likely due to the energy gain upon palladium coordination to MP-102 which is at least 40kJmol-1 higher than upon copper and nickel coordination. © 2014 Elsevier B.V.
Musina A.,Polytechnic University of Bucharest |
Bocokic V.,Magpie Polymers |
Lavric V.,Polytechnic University of Bucharest |
Van Zutphen S.,Magpie Polymers
Industrial and Engineering Chemistry Research | Year: 2014
This work addresses the selective recovery of platinum group metals (PGMs) from aqueous streams, a critical issue within the recycling and metal refining industries aiming to lose zero of the value contained. Herein, selective PGM capture was investigated using three metal-capturing polymeric resins from different manufacturers: a special anion exchanger (Dow), an S-containing chelating resin (Lanxess), and a phosphine oxide containing coordinating resin (Magpie Polymers). The relative affinity of these different materials for the PGMs, as well as copper, was compared under various conditions. It was found that the phosphine oxide based material was the most suitable for the selective capture of PGMs from an oxidizing solution containing high concentrations of copper and counterions. Theoretical calculations using density functional theory (DFT) have shown that the most likely binding of PGMs to this material is a bidentate coordination via the phosphine oxide groups. © 2014 American Chemical Society.
Magpie Polymers | Date: 2015-03-25
A method for preparing trishydroxymethyl phosphine from tetrakishydroxymethyl phosphonium salt, said method comprising at least the steps of continuously feeding a first reaction chamber with, from one hand, at least one tetrakishydroxymethyl phosphonium salt and, from another hand, at least one base, under conditions suitable for a reaction of said tetrakishydroxymethyl phosphonium salt(s) with said base(s), to form a mixture of trishydroxymethyl phosphine and formaldehyde; and continuously removing said formaldehyde.
Magpie Polymers | Date: 2012-09-17
The invention relates to a method for preparing phosphine-based selective transition metal binding particles, said method comprising at least a step of reacting macroporous particles comprising at least one NH reactive function reacted with at least one molar equivalent of a phosphine derivative RP(CH_(2)OH)_(2), with a nucleophile reactive agent of formula NHR^(a)R^(b), wherein NHR^(a)R^(b )comprises at least one NH function.
Magpie Polymers | Date: 2014-09-17
A method for preparing trishydroxymethyl phosphine from tetrakishydroxymethyl phosphonium salt, the method including at least the steps of continuously feeding a first reaction chamber with, from one hand, at least one tetrakishydroxymethyl phosphonium salt and, from another hand, at least one base, under conditions suitable for a reaction of the tetrakishydroxymethyl phosphonium salt(s) with the base(s), to form a mixture of trishydroxymethyl phosphine and formaldehyde; and continuously removing the formaldehyde.