Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 5, pp. 705−710.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © M.V. Afonin, S.A. Simanova, N.M. Burmistrova, N.S. Panina, O.A. Dal’nova, 2012, published in Zhurnal Prikladnoi Khimii, 2012,
Vol. 85, No. 5, pp. 701−706.
AND INDUSTRIAL INORGANIC CHEMISTRY
Recovery of Palladium(II) and Rhodium(III) Chloride Complexes
with a Complexing S,N-Containing Sorbent
M. V. Afonin
, S. A. Simanova
, N. M. Burmistrova
, N. S. Panina
, and O. A. Dal’nova
St. Petersburg State Institute of Technology (Technical University), St. Petersburg, Russia
State Research and Design Institute of Rare Metal Industry, Moscow, Russia
Received July 21, 2011
Abstract—Speciﬁ c features of sorption recovery of palladium(II) and rhodium(III) chloride complexes from
hydrochloric acid and chloride solutions with MITKhAT S,N-containing sorbent were revealed. The kinetic and
capacity characteristics of the sorbent were determined in relation to the solution composition and kind of the
metal. The most probable mechanism of sorption recovery and the composition of the forming Pd(II) and Rh(III)
complexes were suggested.
The development of simple and quick methods for
determination of platinum metals (PMs) in various objects
is still a topical problem. Sorption-spectroscopic methods
based on the use of complexing sorption materials, which
are being actively developed now, are successfully used
for this purpose [1–4].
To improve procedures for sorption preconcentration
of PMs, it is extremely important to know the composition
and structure of the complexes formed by interaction of
platinum metals with functional groups of the sorbents
as polymeric ligands and to understand the effect exerted
by the polymeric matrix of the sorbents on their kinetic
and capacity characteristics [5–7]. The most widely used
sorption materials for preconcentration and recovery of
platinum metals from solutions are those containing sulfur
and sulfur + nitrogen.
The sorbents used can be subdivided into inorganic
[4, 8], including silica gels with complexing groups
grafted to the matrix , and organic, based on an organic
polymeric matrix and modiﬁ ed with various compounds
bearing S,N- and S-containing functional groups [5–7,
10]. A particular place is occupied by sorbents whose
donor atoms are components of the matrix itself. The
amount of sorption sites in such sorbents is considerably
higher than the amount of the possible grafted groups [4,
11–15]. Among such sorption materials, we should note
heterochain sorbents of polycondensation type, formed
by condensation of formaldehyde with hydrogen sulﬁ de
and by thiomethylation of polyamines [13, 16–19].
This study deals with revealing speciﬁ c features of
the sorption recovery of palladium(II) and rhodium(III)
chloride complexes from hydrochloric acid and chloride
solutions with a heterochain S,N-containing low-molec-
ular-weight oligomer, MITKhAT [17–19].
The sorbent, a white crystalline powder (mp 64–65°С
and molecular weight 135), contains approximately 12
wt % N and 47 wt % S. It contains a tertiary nitrogen
atom and alternating methylene and methylene sulﬁ de