Tímea Pernyeszi

Comparative study of the kinetics and equilibrium of phenol biosorption on immobilized white-rot fungus Phanerochaete chrysosporium from aqueous solution

In this study the kinetics and equilibrium of phenol biosorption were studied from aqueous solution using batch technique at an initial pH of 5.5. The biosorption was studied on Ca-alginate beads, on non-living mycelial pellets of Phanerochaete chrysosporium immobilized on Ca-alginate, and on free fungal biomass. Ph. chrysosporium was grown in a liquid medium containing mineral and vitamin materials with complex composition. The biosorption process followed pseudo second-order kinetics on all bioadsorbents. The bioadsorption-equilibrium on blank Ca-alginate, free and immobilized fungal biomass can be described by Langmuir, anti-Langmuir and Freundlich isotherm models using nonlinear least-squares estimation.

Bio-adsorption characteristics of Pseudomonas aeruginosa PAO1

Biosorption of Cd(II) and Pb(II) ions from aqueous solution using lyophilized Pseudomonas aeruginosa PAO1 cells were observed under various experimental conditions. The effect of pH, initial metal concentration, equilib- ration time and temperature on bio-adsorption was investigated. The optimum pH value for Pb(II) adsorption was found to be 5.0, and for Cd(II) 5.0-6.0. The Pb(II) and Cd(II) bio-adsorption equilibrium were analyzed employing the Freundlich and Langmuir Models using nonlinear least-squares estimations. The experimental maximum uptake capacity of Pb(II) and Cd(II) was estimated to be 164 and 113 mg g -1 , respectively. For a kinetic study of the biosorptions, the pseudo second-order kinetic model was applied at various temperatures. The temperature had no significant effect on Pb(II) bio-adsorption. In case of Cd(II) bio-adsorption, the adsorbed amount decreased with increasing tem- perature.

Biosorption characteristics of Spirulina and Chlorella cells for the accumulation of heavy metals

The heavy metal biosorption of dried Chlorella vulgaris and Spirulina platensis-Spirulina maxima cells was studied under various experimental conditions. The effect of biosorbent dosage, pH, adsorption time, temperature, initial metal concentration on biosorption was studied. Biosorption process can be divided into two parts: the first part follows zero-order, the second part pseudo second-order kinetics. Characterization of biosorption equilibrium was evaluated with Langmuir and Dubinin-Radushkevich models using non-linear regression. The optimum pH range was found to be 5.0 − 6.0 for Pb(II) and 4.0 − 6.0 for Cu(II) and Cd(II) adsorption. The maximum adsorption capacities for Pb(II), Cd(II) and Cu(II) were 144, 161 and 138 mg g-1 by Chlorella cells and 370, 201 and 165 by Spirulina cells, based on the experimental data. The same values for activated carbon were 86, 134 and 43 mg g-1, respectively.

Correction to: Use of non-living lyophilized Phanerochaete chrysosporium cultivated in various media for phenol removal

In the original publication of this paper, the Acknowledgements section is missing the statement below.