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Galunin

PhD, Research School of Chemistry & Applied Biomedical Sciences

Tomsk  Polytechnic  University

 

Scopus Author ID: 35217781500

https://orcid.org/0000-0002-8219-0148

 

Research Areas:

  • Analytical Chemistry

  • Radiochemistry

  • Nanotechnology

  • Environmental Science

  • Materials Science

 

The field of my expertise and research interests refers to analytical chemistry, radiochemistry,  materials  science,  nanotechnology and  environmental  science.  During  my career as a researcher, I have been involved in various projects (as a performer) dedicated to sorption and desorption of organic compounds (dyes) heavy metals (Cd, Pb, Zn, Co, Ni, etc.) and non-radioactive analogs of radionuclides – lanthanides (La, Lu, etc) from aqueous media using various types of sorbents (smectite clays, carbon nanotubes- and graphene-based nanomaterials)   for   different   environmental   purposes,   including   water   treatment,   soil remediation  and  constructing  engineered  barriers  in  deep  geological  repositories  of  high- activity radioactive waste. The sorption and desorption processes are studied in a batch mode under various conditions (initial concentration, process temperature, pH). Experimental data are analyzed based on the empirical single Langmuir and Freundlich, Dubinin-Radushkevich and Temkin models, as well as the double Langmuir-Freundlich model in its original and modified (developed by us) forms; the latter considers the contribution of sorption sites with different binding energies (higher and lower) available on the sorbent surface to the sorption process: inner-sphere higher-affinity (specific) sites refer to surface complexation and chemical interactions, whereas outer-sphere lower-affinity (non-specific) sites promoting ionic exchange and electrostatic interactions. Thus, the sorption data analysis using the modified dual-site Langmuir-Freundlich equation makes it possible to estimate the heavy-metal and lanthanide sorption and desorption for each studied sorbent and to select the better material for a specific environmental case. Furthermore, the analysis based on titration and pH-stat tests allow assessing the effect of the aqueous medium pH on the leaching ability of the heavy metals. The developed sorption-desorption procedure may be employed in treating industrial metal- contaminated wastewater, soils and sediments. Besides, it may be used to remove some organic compounds such as dyes, ethylene glycol from different aqueous media.

Regarding  the  nanotechnology,  I  am working  on  using  nanomodified  materials  as sorbents  for  the  above-mentioned  purposes.  The  scope  of  such  sorbents  cover  carbon nanotubes, graphene nanoplatelets and materials on the basis thereof (e.g., polyamine cumulene/graphene, and polyhydroquinone/graphene hybrid composites developed by us), which have shown better sorption and desorption properties (e.g. sorption capacity toward heavy metal ions) compared with conventional sorbents. Thus, they may be potentially used for treating wastewater, remediating soils and sediments, as well as engineered barriers to retain radioactive waste from penetration into the environment.

 

Last updated on 12.01.20


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