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  1. Article ; Online: Cd(II), Zn(II) and Cu(II) bioadsorption on chemically treated waste brewery yeast biomass

    Szende Tonk / Boldizsár Nagy / Anamaria Török / Cerasella Indolean / Cornelia Majdik

    Acta Chimica Slovenica, Vol 62, Iss 3, Pp 736-

    The role of functional groups

    2015  Volume 746

    Abstract: The present article studies the role of functional groups from waste brewery yeast Saccharomyces cerevisiae cells in the bioadsorption of Cd2+, Zn2+ and Cu2+ ions. In order to clarify the role played by these functional groups, the brewery yeast was ... ...

    Abstract The present article studies the role of functional groups from waste brewery yeast Saccharomyces cerevisiae cells in the bioadsorption of Cd2+, Zn2+ and Cu2+ ions. In order to clarify the role played by these functional groups, the brewery yeast was pretreated chemically, thereby helping to determine the mechanisms responsible for binding the target metals. SEM studies were performed to examine the surface microstructure of the adsorbent in pure as well as pretreated forms. The biomass was characterized using FTIR analysis, which indicated that hydroxyl, carboxyl and amid groups are present on the biomass surface. When carboxyl groups were modified by different chemical treatments, the adsorption capacity decreased dramatically, showing that carboxyl groups play a fundamental role in the bioadsorption process. The residual metallic ion concentrations were determined using an Atomic Absorption Spectrophotometer (AAS). Pseudo-first and second order kinetic models were used to describe the bioadsorption process.
    Keywords bioadsorption ; heavy metals ; Saccharomyces cerevisiae yeast cells ; chemical treatment ; SEM and FTIR analysis ; Chemistry ; QD1-999
    Language English
    Publishing date 2015-07-01T00:00:00Z
    Publisher Slovenian Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Linear and nonlinear regression analysis for heavy metals removal using Agaricus bisporus macrofungus

    Boldizsar Nagy / Carmen Mânzatu / Andrada Măicăneanu / Cerasella Indolean / Lucian Barbu-Tudoran / Cornelia Majdik

    Arabian Journal of Chemistry, Vol 10, Iss S2, Pp S3569-S

    2017  Volume 3579

    Abstract: In the present study the biosorption characteristics of Cd (II) and Zn (II) ions from monocomponent aqueous solutions by Agaricus bisporus macrofungus were investigated. The initial metal ion concentrations, contact time, initial pH and temperature were ... ...

    Abstract In the present study the biosorption characteristics of Cd (II) and Zn (II) ions from monocomponent aqueous solutions by Agaricus bisporus macrofungus were investigated. The initial metal ion concentrations, contact time, initial pH and temperature were parameters that influence the biosorption. Maximum removal efficiencies up to 76.10% and 70.09% (318 K) for Cd (II) and Zn (II), respectively and adsorption capacities up to 3.49 and 2.39 mg/g for Cd (II) and Zn (II), respectively at the highest concentration, were calculated. The experimental data were analyzed using pseudo-first- and pseudo-second-order kinetic models, various isotherm models in linear and nonlinear (CMA-ES optimization algorithm) regression and thermodynamic parameters were calculated. The results showed that the biosorption process of both studied metal ions, followed pseudo second-order kinetics, while equilibrium is best described by Sips isotherm. The changes in morphological structure after heavy metal-biomass interactions were evaluated by SEM analysis. Our results confirmed that macrofungus A. bisporus could be used as a cost effective, efficient biosorbent for the removal of Cd (II) and Zn (II) from aqueous synthetic solutions.
    Keywords Agaricus bisporus ; Cd (II) ; Zn (II) ; Biosorption ; SEM ; Regression analysis ; Chemistry ; QD1-999
    Subject code 541
    Language English
    Publishing date 2017-05-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article: The biosorptive effect of untreated and chemically modified fir cone powder on Pb(II) removal

    Mânzatu, Carmen / Boldizsár Nagy / Cornelia Majdik

    European journal of wood and wood products. 2017 July, v. 75, no. 4

    2017  

    Abstract: In this work, the main aim was to investigate the adsorption potential of untreated and chemically modified (sodium hydroxide and hydrogen peroxide treatment) fir cone powder (Abies alba) for the removal of Pb(II) from aqueous solutions. The effect of ... ...

    Abstract In this work, the main aim was to investigate the adsorption potential of untreated and chemically modified (sodium hydroxide and hydrogen peroxide treatment) fir cone powder (Abies alba) for the removal of Pb(II) from aqueous solutions. The effect of contact time, initial concentration of Pb(II), initial pH and temperature was studied in a batch process mode. Adsorption isotherm models (Langmuir, Freundlich, Dubinin–Radushkevich (D–R) and Temkin) and kinetics (pseudo-first-order and pseudo-second-order) models for both processes (treated and untreated) were used to analyse the equilibrium data. The kinetic data were found to fit better the pseudo-second-order. Maximum adsorption capacities calculated using the Langmuir model are 4.8 and 2.9 mg/g for NaOH and H₂O₂ treated fir cone powder, respectively, and 3.7 mg/g for untreated fir cone powder. The results indicate that the NaOH treatment increases the fir cone powder adsorption capacity, while the H₂O₂ treated biomass showed a slight decrease in its adsorption capacity in comparison to the untreated one.
    Keywords Abies alba ; adsorption ; aqueous solutions ; batch systems ; biomass ; hydrogen peroxide ; lead ; models ; pH ; sodium hydroxide ; sorption isotherms ; temperature
    Language English
    Dates of publication 2017-07
    Size p. 623-632.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 2485250-8
    ISSN 1436-736X ; 0018-3768
    ISSN (online) 1436-736X
    ISSN 0018-3768
    DOI 10.1007/s00107-016-1123-1
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  4. Article ; Online: Biosorption of Cadmium Ions by Unmodified, Microwave and Ultrasound Modified Brewery and Pure Strain Yeast Biomass

    Cornelia Majdik / Andrada Măicăneanu / Cerasella Indolean / Szende Tonk / Boldizsár Nagy

    American Journal of Analytical Chemistry , Vol 04, Iss 07, Pp 63-

    2013  Volume 71

    Abstract: The present study investigates the biosorption of cadmium ions from aqueous solution onto unmodified, ultrasound and microwave treated cells of Saccharomyces cerevisiae . FTIR analysis was conducted to characterize the biosorbent. Equilibrium and kinetic ...

    Abstract The present study investigates the biosorption of cadmium ions from aqueous solution onto unmodified, ultrasound and microwave treated cells of Saccharomyces cerevisiae . FTIR analysis was conducted to characterize the biosorbent. Equilibrium and kinetic studies of unmodified RBW (residual brewery waste) cell yeast and DSM 1333 (pure strain) were conducted by considering the effect of initial cadmium ions concentration. Results showed that the ultrasound and microwave treatments decrease the heavy metal uptake compared with the unmodified biomass. Langmuir and Freundlich isotherm models on both unmodified yeast cell types were used to analyze the equilibrium data. It was found that the Langmuir isotherm and pseudo-second-order kinetics models describe better the cadmium ions removal process.
    Keywords Biosorption ; Heavy Metals ; Saccharomyces cerevisiae Cells ; Isotherm ; Kinetics ; Analytical chemistry ; QD71-142 ; Chemistry ; QD1-999 ; Science ; Q ; DOAJ:Analytical Chemistry ; DOAJ:Chemistry
    Subject code 541
    Language English
    Publishing date 2013-07-01T00:00:00Z
    Publisher Scientific Research Publishing
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Biological removal of triphenylmethane dyes from aqueous solution by Lemna minor

    Anamaria Török / Erzsébet Buta / Cerasella Indolean / Szende Tonk / Luminiţa Silaghi-Dumitrescu / Cornelia Majdik

    Acta Chimica Slovenica, Vol 62, Iss 2, Pp 452-

    2015  Volume 461

    Abstract: The aim of this study is to investigate and develop a phytoremediation method for the removal of two triphenylmethane dyes (crystal violet and malachite green) using an aquatic plant, Lemna minor. The effects of operational parameters such as aquatic ... ...

    Abstract The aim of this study is to investigate and develop a phytoremediation method for the removal of two triphenylmethane dyes (crystal violet and malachite green) using an aquatic plant, Lemna minor. The effects of operational parameters such as aquatic plant quantity, initial dye concentration, initial pH of the solutions and temperature of the medium were studied in order to determine the optimum phytoremediation conditions. The plant’s photosynthetic pigments were determined quantitatively in order to detect the plant’s response to abiotic stress. During the phytoremediation experiments the parallel sub-processes (phytosorption, phytoextraction, phytodegradation) were observed and analysed. The mechanisms of phytoremediation were studied using Fourier transformation infrared spectroscopy, ultraviolet-visible spectroscopy, thin layer chromatography and Energy-dispersive X-ray spectroscopy. Results show that the plant tolerated high concentrations (300 mg/L) of dyes, and was able to remove from the environment and accumulate in its cells the dyes up to a significant percentage (crystal violet was removed by about 80% and malachite green by 90%).
    Keywords Lemna minor ; phytoremediation ; aquatic plant ; triphenylmethane dyes ; photosynthetic pigments ; Chemistry ; QD1-999
    Subject code 580
    Language English
    Publishing date 2015-03-01T00:00:00Z
    Publisher Slovenian Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article: Laboratory tests for the phytoextraction of heavy metals from polluted harbor sediments using aquatic plants

    Mânzatu, Carmen / Alessio Ceccarini / Boldizsár Nagy / Cornelia Majdik / Renato Iannelli / Stefania Giannarelli

    Marine pollution bulletin. 2015 Dec. 30, v. 101, no. 2

    2015  

    Abstract: The aim of this study was to investigate the concentrations and pollution levels of heavy metals, organochlorine pesticides, and polycyclic aromatic hydrocarbons in marine sediments from the Leghorn Harbor (Italy) on the Mediterranean Sea. The ... ...

    Abstract The aim of this study was to investigate the concentrations and pollution levels of heavy metals, organochlorine pesticides, and polycyclic aromatic hydrocarbons in marine sediments from the Leghorn Harbor (Italy) on the Mediterranean Sea. The phytoextraction capacity of three aquatic plants Salvinia natans, Vallisneria spiralis, and Cabomba aquatica was also tested in the removal of lead and copper, present in high concentration in these sediments. The average detectable concentrations of metals accumulated by the plants in the studied area were as follows: >3.328±0.032mg/kg dry weight (DW) of Pb and 2.641±0.014mg/kg DW of Cu for S. natans, >3.107±0.034g/kg DW for V. spiralis, and >2.400±0.029mg/kg DW for C. aquatica. The occurrence of pesticides was also analyzed in the sediment sample by gas chromatography coupled with mass spectrometry (GC/MS).Due to its metal and organic compound accumulation patterns, S. natans is a potential candidate in phytoextraction strategies.
    Keywords aquatic plants ; Cabomba ; copper ; gas chromatography-mass spectrometry ; heavy metals ; laboratory experimentation ; lead ; marine sediments ; organochlorine pesticides ; phytoremediation ; polycyclic aromatic hydrocarbons ; Salvinia natans ; Vallisneria spiralis ; water pollution ; Italy ; Mediterranean Sea
    Language English
    Dates of publication 2015-1230
    Size p. 605-611.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2001296-2
    ISSN 1879-3363 ; 0025-326X
    ISSN (online) 1879-3363
    ISSN 0025-326X
    DOI 10.1016/j.marpolbul.2015.10.045
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  7. Article ; Online: Comparative Studies of the Phytoextraction Capacity of Five Aquatic Plants in Heavy Metal Contaminated Water

    Erzsébet BUTA / Anamária TÖRÖK / Bilassé ZONGO / Maria CANTOR / Mihai BUTA / Cornelia MAJDIK

    Notulae Botanicae Horti Agrobotanici Cluj-Napoca, Vol 42, Iss 1, Pp 173-

    2014  Volume 179

    Abstract: The uptake capacity of the aquatic plants ( Salvinia natans Kunth., Eichhornia crassipes Mart., Lemna minor L., Elodea canadensis Michx., Pistia stratiotes L.) was analyzed in phytoextraction of Cu 2+ , Zn 2+ , and Cd 2+ . It was attend to study the ... ...

    Abstract The uptake capacity of the aquatic plants ( Salvinia natans Kunth., Eichhornia crassipes Mart., Lemna minor L., Elodea canadensis Michx., Pistia stratiotes L.) was analyzed in phytoextraction of Cu 2+ , Zn 2+ , and Cd 2+ . It was attend to study the plants capacity comparatively using mono and multimetallic systems. In particular, the chlorophyll, protein and carotenoids contents were studied during heavy metals uptake, in order to observe the stress effect on plants. The results obtained for the monometallic system showed that Salvinia natans Kunth. accumulated the highest quantity of Cu 2+ (4.72 mg/g), Zn 2+ (2.23 mg/g) and Cd 2+ (1.90 mg/g). The leaves of Lemna minor L. accumulated the highest concentration of Cu 2+ (10.80 mg/g) and Cd 2+ (2.78 mg/g) in multimetallic system. The water lettuce ( Pistia stratiotes L.) translocated the highest quantity of Zn 2+ in its roots (4.80 mg/g). The chlorophyll and the carotenoids levels decreased under the stress of heavy metals in both systems, while protein content increased under the influence of Cu 2+ and Cd 2+ , but decreased for Zn 2+ . The studied hydrophytes proved to be useful in the uptake of heavy metals in monometallic system and much more effective in the multimetallic system and showed great potential for further applications in the industrial and commercial wastewater treatments.
    Keywords Forestry ; SD1-669.5 ; Agriculture (General) ; S1-972
    Subject code 333
    Language English
    Publishing date 2014-06-01T00:00:00Z
    Publisher AcademicPres
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Application of immobilized waste brewery yeast cells for Cd2+ removal. Equilibrium and kinetics

    SZENDE TONK / ANDRADA MĂICĂNEANU / CERASELLA INDOLEAN / SILVIA BURCA / CORNELIA MAJDIK

    Journal of the Serbian Chemical Society, Vol 76, Iss 3, Pp 363-

    2011  Volume 373

    Abstract: In this investigation, the removal of Cd2+ by a brewery waste biomass in immobilized (Ca alginate beads) form was studied. The removal process was conducted at room temperature under batch conditions (magnetic stirring) using different initial cadmium ... ...

    Abstract In this investigation, the removal of Cd2+ by a brewery waste biomass in immobilized (Ca alginate beads) form was studied. The removal process was conducted at room temperature under batch conditions (magnetic stirring) using different initial cadmium concentrations. The equilibrium of biosorption was reached in 150 min for all employed initial concentrations. The maximum biosorption capacity was calculated to be 5.96 mg Cd2+ g-1 yeast for an initial Cd2+ concentration of 169 mg L-1. Langmuir and Freundlich adsorption isotherms were used to correlate the equilibrium adsorption data. Based on the correlation coefficients, it was concluded that the Langmuir isotherm is more suitable for describing the equilibrium data of cadmium biosorption. In addition, first and pseudo-second order kinetic models were applied to describe the biosorption process. The kinetic parameters for the pseudo-second order kinetics were determined.
    Keywords Saccharomyces cerevisiae ; immobilization ; cadmium biosorption ; Freundlich and Langmuir models ; kinetic models ; Chemistry ; QD1-999
    Subject code 660
    Language English
    Publishing date 2011-03-01T00:00:00Z
    Publisher Serbian Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article: Phytoremediation capacity of aquatic plants is associated with the degree of phytochelatin polymerization

    Török, Anamaria / Zsolt Gulyás / Gabriella Szalai / Gábor Kocsy / Cornelia Majdik

    Journal of hazardous materials. 2015 Dec. 15, v. 299

    2015  

    Abstract: Phytochelatins (PCs) play important role in phytoremediation as heavy metal binding peptides. In the present study, the association between heavy metal removal capacity and phytochelatin synthesis was compared through the examination of three aquatic ... ...

    Abstract Phytochelatins (PCs) play important role in phytoremediation as heavy metal binding peptides. In the present study, the association between heavy metal removal capacity and phytochelatin synthesis was compared through the examination of three aquatic plants: Elodea canadensis, Salvinia natans and Lemna minor. In case of a Cd treatment, or a Cd treatment combined with Cu and Zn, the highest removal capacity was observed in L. minor. At the same time, E. canadensis showed the lowest removal capacity except for Zn. The heavy metal-induced (Cu+Zn+Cd) oxidative stress generated the highest ascorbate level in L. minor. Cd in itself or combined with the other two metals induced a 10–15-fold increase in the amount of ɣ-glutamylcysteine in L. minor while no or smaller changes were observed in the other two species. Correspondingly, the total PC content was 6–8-fold greater in L. minor. In addition, PCs with higher degree of polymerization were only observed in L. minor (PC4, PC6 and PC7) while PC2 and PC3 occurred in E. canadensis and S. natans only. The correlation analysis indicated that the higher phytoremediation capacity of L. minor was associated with the synthesis of PCs and their higher degree of polymerization.
    Keywords Elodea canadensis ; Lemna minor ; Salvinia natans ; aquatic plants ; cadmium ; copper ; heavy metals ; oxidative stress ; phytochelatins ; phytoremediation ; polymerization ; zinc
    Language English
    Dates of publication 2015-1215
    Size p. 371-378.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2015.06.042
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