ISSN 1070-4272, Russian Journal of Applied Chemistry, 2014, Vol. 87, No. 5, pp. 579−584. © Pleiades Publishing, Ltd., 2014.
Original Russian Text © A.A. Kushnir, P.T. Sukhanov, E.V. Churilina, G.V. Shatalov, 2014, published in Zhurnal Prikladnoi Khimii, 2014, Vol. 87, No. 5, pp. 589−594.
AND ION EXCHANGE PROCESSES
Dynamic Sorption of Nitrophenols from Aqueous Solutions
by Polymers Based on N-Vinylpyrrolidone
A. A. Kushnir
, P. T. Sukhanov
, E. V. Churilina
, and G. V. Shatalov
Voronezh State University of Engineering Technologies, pr. Revolutsii 19, Voronezh, 394036 Russia
Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia
Received February 25, 2014
Abstract—Sorption properties of a polymer based on N-vinylpyrrolidone and ethylene glycol dimethacrylate
were studied for the example of sorption of nitrophenols from aqueous solutions under dynamic conditions. The
conditions providing a 180–480-fold concentration in dynamic sorption and desorption of nitrophenols from
aqueous solution were substantiated.
Nitrophenols may be contained in natural water and
wastewater from pharmaceutical and steel-making indus-
tries, oil-processing plants, and shops for manufacture of
plastics, leather, paints, and dyes. These compounds are
formed in degradation of certain kinds of organophos-
phorus pesticides .
Phenolic compounds exert a toxic inﬂ uence on hu-
mans, animals, and plants and impart an unpleasant taste
and odor to potable water even at very low concentrations.
This compounds are controlled by nature-protecting regu-
lations in many countries; in particular, 2-nitrophenol,
4-nitrophenol, and 2,4-dinitrophenol are included in the
list of the Environmental Protection Agency (United
States) and in list A1 of the European Community .
Nitrophenols are concentrated on activated carbons,
foamed polyurethanes, carbon nanospheres, and natural
materials: zeolites, bentonites, alumina, and sand .
However, their application involves problems associated
with the quantitative desorption and small degrees of
recovery of nitrophenols.
One of ways to tackle with the problem is to obtain
new polymeric sorbents and use these to concentrate
toxicants from water media.
Of practical interest are polymers based on N-vinyl-
pyrrolidone (VP) contained in the known commercial
sorbents Oasis and Strata-X, which provide a large degree
of recovery of nitrophenols, compared with polystyrenes
. Of current concern are a search for, and development
of new VP-based sorbents with prognosticated properties
for making wider their application ﬁ eld.
The goal of our study was to examine the sorption
properties of a polymer based on N-vinylpyrrolidone with
respect to nitrophenols and to ﬁ nd the optimal conditions
of their sorption and desorption.
Preparations of 2- (2-NP), 3- (3-NP), 4-nitrophenols
(4-NP), 2,4- (2,4-DNP), 2,5- (2,5-DNP), 2,6-dinitrophe-
nols (2,6-DNP), and 2,4,6-trinitrophenol (2,4,6-TNP)
were puriﬁ ed by recrystallization of commercial prepa-
rations by the known method  and identiﬁ ed by their
melting points. The working solutions were prepared from
precisely weighed portions by dissolution of the starting
substances in twice-distilled water.
Nitrophenols were concentrated with a sorbent pro-
duced by radical polymerization of a functional monomer
of N-vinylpyrrolidone and a cross-linking agent (CLA)
(ethylene glycol dimethacrylate, EGDMA) in the pres-
ence of a polymerization initiator (azobisisobutyrodini-