Omsk State University, Omsk, Russia:

L. N. Adeeva, Professor, e-mail: l.n.adeeva@gmail.com
T. A. Didenko, Assistant Professor
E. N. Pomytkina, Student
M. S. Vakunova, Student
V. F. Borbat, Professor, Head of a Chair of Inorganic Chemistry

There were determined the regularities of platinum (IV) and palladium (II) sorption from sulfate-chloride solutions on new organic-mineral sorbent, received by putting of polyaniline on carbon-mineral material surface. Secondary amino groups are placed on modified sorbent surface. These groups form the sorbent properties of anion. There was established the dependence of sorption of platinum (IV) and palladium (II) from model solutions on various factors, such as рН, equilibrium concentration of metal ion and duration of phases’ contact. There is shown, that modified carbon-mineral sorbent can be used for extraction of metals from platinum chloride-sulfate solutions. Exchange capacity of platinum (IV) and palladium (II) is 62.2 mg·g^–1 and 67.0 mg·g^–1, respectively. For the purpose of selective extraction of platinum metals by modified sorbent, there were performed the experiments for extraction of palladium (II) from model solutions, containing Pd²⁺ and extraneous ions (copper (II), nickel (II), chloride ions, sulfate ions or oxalate ions). It is shown that sorbent capacity on platinum metals is not reduced in the presence of copper (II) ions. Presence of chloride, sulfate and oxalate ions in solution in concentrations, which are by 10–50 times higher than platinum metal concentration, reduces its sorption by 15–30%. The modified sorbent is applied for extraction of palladium (II) ions from solution of exhaust homogeneous copper-palladium catalyst of industrial receiving of ethyl aldehyde. Content of main components (palladium (II), copper (II), chlorides, sulfates and oxalate ions) is defined in catalyst solution. Studying of influence of Cu²⁺, SO₄^2–, Cl^– and C₂O₄^2– ions on palladium sorption efficiency is carried out on model solutions. Degree of palladium extraction from exhaust homogeneous catalyst for one stage was 95,3±0,3%.

1. Simanova S. A., Kuznetsova T. V., Konovalov L. V., Shchukarev A. V. Zhurnal prikladnoy khimii — Russian Journal of Applied Chemistry. 2005. Vol. 78, No. 5. pp. 729–735.
2. Ergozhin E. E., Akimbaev A. M. Organomineralnye sorbenty i polufunktsionalnye sistemy na osnove prirodnogo alyumosilikatnogo i ugolno-mineralnogo syrya (Organic-mineral sorbents and semifunctional systems on the basis of natural alumosilicate and carbon mineral raw materials). Almaty : LLP “Print-S”, 2007. 373 p.
3. Adeeva L. N., Kovalenko T. A. Zhurnal prikladnoy khimii — Russian Journal of Applied Chemistry. 2012. Vol. 85, No. 4. pp. 535–541.
4. Adeeva L. N., Fisyuk A. S., Kovalenko T. A., Kostyuchenko A. S. Sposob polucheniya modifitsirovannogo sorbenta platinovykh metallov (Method of obtaining of modified sorbent of platinum metals). Patent RF, No. 2491990, MPK51 B 01 J 20/30, B 01 J 20/26. Applicant and patent-holder: Omsk State University. Applied : April 16, 2012. Published : September 10, 2013. Bulletin No. 25.
5. OST 3801267.1–82. Metodika analiza na platinu (Industry standard 3801267.1–82. Method of analysis on platinum). Moscow : VNIIneftekhim, 1982. 4 p.
6. Ginzburg S. I. et al. Analiticheskaya khimiya platinovykh metallov (Analytical chemistry of platinum metals). Moscow : Nauka, 1972. 614 p.
7. W. F. Hillebrand, H. A. Lundell, H. A. Bright, J. I. Hoffman. Prakticheskoe rukovodstvo po neorganicheskomu analizu : perevod s angliyskogo (Applied inorganic analysis : translated from English). Moscow : Goskhimizdat, 1957. 1016 p.
8. W. John Williams. Opredelenie anionov : perevod s angliyskogo (Handbook of anion determination : translated from English). Moscow : Khimiya, 1982. 621 p.