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ADSORPTION OF CADMIUM IONS ON CHITOSAN MEMBRANES: KINETICS AND EQUILIBRIUM STUDIES

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Zielińska K., Chostenko A. G., Truszkowski S.
Progress on Chemistry and Application of Chitin and its Derivatives
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2010
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vol. 15
73 - 78
EN
The presence of toxic heavy metals in industrial wastewater is a serious pollution problem. The ability of chitosan membranes as an adsorbent for cadmium ions in aqueous solution was studied. Experiments were carried out as function of contact time and concentration of cadmium ions. This study has shown that chitosan is capable of removing cadmium from aqueous solution. The removal efficiency depends on reaction time and concentration of cadmium. The Langmuir and Freundlich adsorption models were applied to describe the isotherms and isotherm constants. Equilibrium data agreed very well with the Langmuir model. The maximum adsorption capacity of the Langmuir isotherm equation was 94 mg/g and the Langmuir adsorption equilibrium constant was 1.6 × 10-3 dm3/mg at 25 °C.
2
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Preparation of polymeric nanoparticles using a new polymerizable surfactant

100%
Bunio P., Zielińska K., Chlebicki J., Wilk K.
Open Physics
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2011
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vol. 9
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issue 2
570-575
EN
A novel polymerizable surfactant (so-called surfmer) was synthesized and characterized according to its structure, surface activity and polymerization ability. Polymeric micelles (size of 6 and 130 nm) appeared in the polyreaction initiated by free radicals from VA-044. In the presence of the monomer (i.e., methyl methacrylate) microemulsion systems were formed that in turn were transformed into latex entities (size - 40 nm). Additionally, an emulsion polymerization was performed with the use of n-hexadecane as an oil phase resulting in the production of nanocapsules (size in the range - 165–220 nm). The shape and morphologies of the nanoobjects were confirmed using Atomic Force Microscopy (AFM).
3
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Adaptation of the “Herbarium” Computer Database to Archiving and Analysis of Floristic Data

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Zielińska K., Jakubowska-Gabara J., Kołodziejek J.
Acta Universitatis Lodziensis. Folia Biologica et Oecologica
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2010
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vol. 6
145-150
EN
The aim of the study was to present “Herbarium” computer database. The basic goal of construction of the database was gathering and analysing of archival and contemporary floristic data referring to the area of Central Poland. Registered information considers the stands and characteristic biological and ecological traits of particular taxa. Life forms, indices of ecological requirements, the phytogeographical elements, protection and threat status are among them. The database enables the presentation of geographical distribution of taxa in the area of Central Poland with the cartogram method based on the grid of 2 km2 according to the Distribution Atlas of Vascular Plants in Poland (ATPOL).
4
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Transformation of Forest Vegetation after 40 Years of Protection in the Tomczyce Nature Reserve (Central Poland)

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Kiedrzyński M., Zielińska K., Grzelak P.
Acta Universitatis Lodziensis. Folia Biologica et Oecologica
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2011
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vol. 7
207-227
EN
The Tomczyce nature reserve is characterized by a degenerated forest vegetation. We assume that the regeneration process was possible to launch after the establishment of the nature reserve in 1968. The vegetation of the Tomczyce forest complex was characterized for the first time by Jakubowska-Gabara (1976) whose studies were taken as a basis of our research. The phytocenoses after 40. years of protection have a greater participation of species with higher trophic and moisture requirements. The regeneration process in communities with pine trees is caused by an expansion of broad-leaved trees and shrubs. Transformation of forest vegetation causes a decrease in cover of thermophilous and heliophilous species. On the other hand, species of oak-hornbeam forests as well as anthropophytes are in expansion. Planning of the protection activities in the nature reserve needs to include these dynamic tendencies of the vegetation.
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