Iva MELČÁKOVÁ¹, Daniela PLACHÁ¹, Jana NOVAKOVÁ¹, Tomáš RUŢOVIČ¹ & Peter ANDRÁŠ^2,3
1VŠB -Technical University of Ostrava, 17.listopadu 15/2172, 708 33Ostrava-Poruba, Czech Republic
iva.melcakova@vsb.cz, daniela.placha@vsb.cz, jana.novakova@vsb.cz, tomas. ruzovic@vsb.cz
² Faculty of Natural Sciences, Matej Bel University, Tajovského 40, 974 01 Banská Bystrica; Slovakia
peter.andras@umb.sk
³ Geological Institute, Slovak Academy of Sciences, Ďumbierska, 1, 974 01 Banská Bystrica, Slovakia
andras@savbb.sk

STUDY OF BIOSORPTION OF Zn(II) IONS FROM AQUEOUS SOLUTIOS BY ACTIVATED MIXED BIOMASS OF KNOTWEED REYNOUTRIA JAPONICA

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The ability of mixed biomass (stems and leaves) of an invasive plant Reynoutria japonica tobind up Zn(II) ions has been studied. For modelling of kinetic data, pseudo-second-order model was used.The sorption equilibrium data were described by the Langmuir and Freundlich models; the processeswere in concordance with obtained Langmuir and Freudlich isotherms. Both linear and non-linear modelswere suitable for data modelling. Maximal sorption capacity for Zn(II) was 8.97 mg/g (PAB 0.5). Thesorption mechanism explained as ion exchange was described using EDS analyses. The binding groups ofleaves and stems of R. japonica biomass were analyzed using FTIR method. For desorption of Zn(II)from R. japonica mixed biomass, 0.2M H₂SO₄ was successfully used.