Nanostructured surfaces

Synthesis and sorption properties of organo-mineral sorbent based on poly(4-vinylpyridine-b-styrene) copolymer
M. Tovstenko-Zabelin1, L.O. Vretik1, E.S. Yanovska1, O.A. Nikolaeva1, I.O. Savchenko1,O. Kondratenko2, D. Sternik3

1 Taras Shevchenko National University of Kyiv, Volodymyrs’ka Str., 64/13, Kyiv-01601, Ukraine
E-mail: lvretik@gmail.com;
2 Ivan Franko Zhytomyr State University, 42 Pushkina  Str., 10008 Zhytomyr, Ukraine
3Maria Curie-Skłodowska University, 2 Maria Curie-Sklodowska Sq., 20-031 Lublin, Poland

A perspective approach to produce effective sorbents for heavy metal ions is a modification of porous inorganic materials with complexing organic layers. This idea was proved in our previous investigations: organo-mineral composites based on a silica gel/saponite clay and in situ immobilized statistic copolymer poly(4-vinylpyridine-co-styrenene) showed high sorption capacity to Pb (II), Cd (II), Zn (II), Cu (II) and Fe (III) ions [1,2]. 
The presented study is devoted to the syntheses of a new organo-mineral composites based on block-copolymer poly(4-vinylpyridine-b-styrene) (PVP-b-PS) and their sorption properties. S-functionalized block-copolymers (PVP-b-PS) were synthesized by RAFT polymerization and were immobilized on the silica gel from a THF solution. The sorption behavior of composites was investigated in a static mode from water solutions of Pb (II), Cu (II), and Fe (III) nitrates. The best sorption properties were found for the composite with ~17 wt.% content of PVP-b-PS (molar ratio styrene:4-vinylpyridine=1:4). A sorption capacity of silica gel increased in 4 times for Cu (II), 3.5 times for Pb (II) and 2 times for Fe (III) ions.

1.	Yanovska E.S., Vretik L.O., Nikolaeva O.A. et al Synthesis and adsorption properties of 4-vinylpyridine and styrene copolymer in situ immobilized on silica surface // Nanoscale Research Letters.- 2017.- 12.- P. 217-222.
2.	Yanovska E.S., Vretik L.O., Kondratenko O. et al Synthesis and adsorption properties of 4-vinylpyridine, styrene and maleic anhydride copolymer in situ immobilized on silica surface // Molecular Crystals and Liquid Crystals.- 2018.- 672 (1, part 3), 104-114.