1. Dept. of Chemical and Environmental Engineering, Univ. of Debrecen, 2-4 Ótemető St., Debrecen HU-4028, HU (Corresponding author), e-mail: kocsis.denes@eng.unideb.hu
2. Dept. of Applied Chemistry, Univ. of Debrecen, 1 Egyetem Square, Debrecen HU-4032, HU, e-mail: deak.gyorgy@science.unideb.hu
3. Dept. of Applied Chemistry, Univ. of Debrecen, 1 Egyetem Square, Debrecen HU-4032, HU, e-mail: keki.sandor@science.unideb.hu
4. Dept. of Information Technology, Univ. of Debrecen, 26 Kassai St., Debrecen HU-4028, HU, e-mail: godo.zoltan@inf.unideb.hu
5. Dept. of Chemical and Environmental Engineering, Univ. of Debrecen, 2-4 Ótemető St., Debrecen HU-4028, HU, e-mail: horobjan@gmail.com