Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 7, pp. 1225−1229.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
A.S. Chukhno, I.B. Dmitrieva, K.P. Tikhomolova, N.V. Voronkova, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83,
No. 7, pp. 1119−1123.
AND CORROSION PROTECTION OF METALS
Electro-Surface Properties of Nickel(II) and Iron(III)
Oxides in Aqueous Solutions of 1,2,4-Triazole
A. S. Chukhno, I. B. Dmitrieva, K. P. Tikhomolova, and N. V. Voronkova
Research Institute of Chemistry, St. Petersburg State University, St. Petersburg, Russia
Received March 2, 2010
Abstract—It was studied in systems constituted by aqueous solutions of 1,2,4-triazole, and NiO and Fe
adsorbents how the electrokinetic potential of the surface of the oxides, amount of adsorbed triazole, and its
concentration in solution vary during a long time.
Recently, development of various “chemical models”
of the speciﬁ c adsorption of ions has been commenced.
The principal issue in the construction of these models
was that of chemical processes occurring in the vicinity of
the near-surface layer in the course of adsorption, which
gave impetus to theoretical and experimental studies
at the chair of colloid chemistry at St. Petersburg State
University. Of particular interest are studies devoted to the
speciﬁ c adsorption of nitrogen-containing heterocyclic
compounds, azoles in the case in question, on the surface
of transition metal oxides.
The increased scientiﬁ c interest in studies of this kind
is due to the fact that nitrogen-containing heterocyclic
compounds are important ligands of coordination
chemistry. From the practical standpoint, these studies
are of interest in that heterocyclic compounds are
fragments of biologically important objects responsible
for binding of metals in living organisms. Numerous
medicinal preparations have been created on their basis.
Metal-containing compounds occupy an important place
in the world’s assortment of plant protection means.
In particular, derivatives of 1,2,3-triazole have been
suggested for use as fungicides, insecticides, and growth
controllers. Preparations based on complex compounds
of this kind markedly improve the pesticide properties
of polymeric materials and formulations on their basis.
Complex compounds are effectively used in mixtures
with other pesticides to produce biocide paints for ship
bottoms and other underwater constructions.
It has also been experimentally revealed [1, 2] that
some representatives of azoles affect the yield of nickel
ferrite in its synthesis from aqueous solutions of nickel(II)
and iron(III) salts. In this case, the reaction efﬁ ciency
strongly depends on the nature and concentration of
azoles, concentrations of salts of these metals, relative
amounts of reactants, pH value, and a number of other
factors. Therefore, it is highly important to study the
electro-surface properties of oxides of ferrite-like metals
and, speciﬁ cally, nickel(II) and iron(III) oxides.
This study is one of the series [3, 4] devoted to
adsorption of azoles on the surface of transition metal
oxides. The goal of our study was to experimentally
examine the electro-surface properties (ζ-potential,
) of nickel(II) oxide (NiO) and iron(III) oxide
) in aqueous solutions of 1,2,4-triazole (henceforth
triazole) in relation to the concentrations and pH values
of the solutions and make a qualitative analysis of the
information obtained as regards its correlation with
concepts of the coordination model of adsorption [5–7].
We chose as objects of study aqueous solutions of