Green Processing and Synthesis | |
Comparison of Rhodotorula sp. and Bacillus megaterium in the removal of cadmium ions from liquid effluents | |
article | |
Mihaela Roşca1  Raluca-Maria Hlihor1  Petronela Cozma1  Elena Niculina Drăgoi3  Mariana Diaconu1  Bruna Silva4  Teresa Tavares4  Maria Gavrilescu1  | |
[1] Department of Environmental Engineering and Management, Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi;Department of Horticultural Technologies, Faculty of Horticulture, “Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine of Iasi;Department of Chemical Engineering, Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi”Technical University of Iasi;Centre of Biological Engineering (CEB), University of Minho, Campus de Gualtar;Academy of Romanian Scientists | |
关键词: biosorption; Cd(II); microorganisms; modeling; statistical model; | |
DOI : 10.1515/gps-2016-0218 | |
来源: De Gruyter | |
【 摘 要 】
This study compares the capacity of Rhodotorula sp. and Bacillus megaterium for Cd(II) removal considering the influence of operating parameters (pH, biosorbent dosage, contact time, temperature, initial metal concentration in solution). The highest Cd(II) uptake of 14.2 mg/g by Rhodotorula sp. was exhibited at 30°C, when working at pH 6 and with 5 g/l biosorbent dosage, after 48 h of contact time. In these conditions, a removal efficiency of 85% was obtained. Similar outcomes were obtained for B. megaterium (15.1 mg/g, 90%) at 35°C, pH 4 and 3 g/l biosorbent dosage, considered as the optimum set of parameters, equilibrium being achieved for a contact time of 20 min. The possible interaction mechanisms between the biosorbents and Cd(II) were evaluated through point of zero charge (pH pzc ), Fourier transform infrared (FTIR), spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray microanalysis (SEM-EDX). Data were modeled using pseudo-first and pseudo-second order kinetic models and Langmuir and Freundlich isotherms models. Further studies considered a modeling approach based on linear regression with Durbin-Watson statistics, while the accuracy and precision of experiments were evaluated by ANOVA.
【 授权许可】
CC BY
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
RO202107200001694ZK.pdf | 1315KB | download |