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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 ; 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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  4. 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
    Database NAL-Catalogue (AGRICOLA)

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