TY  - JOUR
A1  - Trautmann, Michael
A1  - Lubahn, Susanne
A1  - Holdt, Hans-Jürgen
T1  - Preparation, characterisation and properties of sulphoxide modified polystyrene resins for solid-phase extraction of Pt-IV, Ru-III and Ru-IV from hydrochloric acid
JF  - Reactive & functional polymers
N2  - New sulphoxide modified resins were synthesized using poly(styrene-co-divinylbenzene) (PS-DVB) as matrix. Infrared spectroscopy and elemental analysis were used for characterisation. Solid-phase extraction of Pt-IV, Ru-III and Ru-IV from acidic chloride solutions was performed via batch experiments. Influence of spacer length between sulphoxide and matrix (ethylene, hexamethylene), substitution of sulphoxide (R-1: ethyl, hexyl, phenyl) and bead size of PS-DVB (spherical beads: d(50) < 155 mu m, d(50) < 80 mu m; powder: d(50) < 30 mu m) on adsorption was investigated subjected to acidity. Experimental results showed that ethyl substituted sulphoxide immobilised onto ground PS-DVB and hexamethylene spacer exhibited best adsorption properties. Different kinetic models and isotherms were fitted to the experimental data to identify extraction mechanism. Pt-IV was quantitative sorbed at [HCl] <= 0.1 mol/L whereas Ru-III and Ru-IV sorption ranged between 90% and 95% at [HCl] 5 mol/L. Desorption was reached using a solution of 0.5 M thiourea (Tu) in 0.1 M HCl at 90 degrees C. Separation of Pt-IV and Rum occurred at [HCl] <= 0.1 mol/L whereas Pt-IV was extracted and Ru-III remained in solution. A further separation was achieved by extracting Pt-IV and Ru-IV at 5 M HCl followed by sequential elution of Pt-IV with concentrated HCl and Ru-IV with 0.5 M Tu in 0.1 M HCl at 90 degrees C. 2014 Elsevier B.V. All rights reserved.
KW  - Solid-phase extraction
KW  - Platinum group metals
KW  - Polystyrene-divinylbenzene
KW  - Sulphoxide
KW  - Adsorption kinetic
Y1  - 2014
U6  - https://doi.org/10.1016/j.reactfunctpolym.2014.07.001
SN  - 1381-5148
SN  - 1873-166X
VL  - 83
SP  - 84
EP  - 97
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Träger, Juliane
A1  - Klamroth, Tillmann
A1  - Kelling, Alexandra
A1  - Lubahn, Susanne
A1  - Cleve, Ernst
A1  - Mickler, Wulfhard
A1  - Heydenreich, Matthias
A1  - Müller, Holger
A1  - Holdt, Hans-Jürgen
T1  - Complexation of Palladium(II) with unsaturated Dithioethers a systematic development of highly selective ligands for solvent extraction
JF  - European journal of inorganic chemistry : a journal of ChemPubSoc Europe
N2  - There is a demand for new and robust PdII extractants due to growing recycling rates. Chelating dithioethers are promising substances for solvent extraction as they form stable square-planar complexes with PdII. We have modified unsaturated dithioethers, which are known to coordinate PdII, and adapted them to the requirements of industrial practice. The ligands are analogues of 1,2-dithioethene with varying electron-withdrawing backbones and polar end-groups. The crystal structures of several ligands and their palladium complexes were determined as well as their electro- and photochemical properties, complex stability and behaviour in solution. Solvent extraction experiments showed the superiority of some of our ligands over conventionally used extractants in terms of their very fast reaction rates. With highly selective 1,2-bis(2-methoxyethylthio)benzene (4) it is possible to extract PdII from a highly acidic medium in the presence of other base and palladium-group metals.
KW  - Renewable resources
KW  - Palladium
KW  - Chelates
KW  - Ligand design
KW  - S li-gands
Y1  - 2012
U6  - https://doi.org/10.1002/ejic.201101406
SN  - 1434-1948
IS  - 14
SP  - 2341
EP  - 2352
PB  - Wiley-VCH
CY  - Weinheim
ER  -