Sorption of lead ions from aqueous solution onto Enterococcus faecium biomass

2013 ◽  
Vol 68 (7) ◽  
pp. 1550-1555 ◽  
Author(s):  
Meral Yilmaz Cankilic ◽  
R. Bengu Karabacak ◽  
Turgay Tay ◽  
Merih Kivanc
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacterium ◽  
Enterococcus Faecium ◽  
Lead Concentration ◽  
Lead Removal ◽  
Order Kinetic ◽  
Lead Uptake ◽  
Solution Ph ◽  
Initial Ph ◽  
Lead Sorption

This study reports kinetics and equilibrium of lead sorption onto the biomass of Enterococcus faecium. E. faecium is a lactic acid bacterium and was isolated from meat. Batch experiments were carried out to analyze the effects of the initial lead concentration, initial pH of the medium, agitation time and temperature on the biosorption. The lead sorption was found to increase with the increase in the solution pH, reaching a plateau value beyond pH 5, and the most favorable pH for removal was determined as 5.0. The highest lead uptake capacity of the biomass was obtained at the initial lead concentration of 300 mg L–1. The Langmuir and Freundlich adsorption models were applied to determine the biosorption isotherm, and the equilibrium data correlated well with the Langmuir model. The pseudo-second-order kinetic model was more suitable to fit the experimental data. The results were promising that the biomass of this lactic acid bacterium can be successfully used as a convenient adsorbent for lead removal from aqueous solutions.

Enterococcus faecium QU 50: a novel thermophilic lactic acid bacterium for high-yield l-lactic acid production from xylose

2014 ◽  
Vol 362 (2) ◽  
pp. 1-7 ◽  
Author(s):  
Mohamed Ali Abdel-Rahman ◽  
Yukihiro Tashiro ◽  
Takeshi Zendo ◽  
Kenji Sakai ◽  
Kenji Sonomoto
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacterium ◽  
Enterococcus Faecium ◽  
Acid Production ◽  
Lactic Acid Production ◽  
High Yield

scholarly journals Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell

2020 ◽  
Vol 12 (3) ◽  
pp. 1174 ◽  
Author(s):  
Lulit Habte ◽  
Natnael Shiferaw ◽  
Mohd Danish Khan ◽  
Thenepalli Thriveni ◽  
Ji Whan Ahn
Keyword(s):  
Experimental Data ◽  
Synthetic Wastewater ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Solution Ph ◽  
Surface Precipitation ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
High Sorption ◽  
Pseudo Second Order

In the present work, waste eggshells were used as a precursor for the synthesis of aragonite crystals through the wet carbonation method. Cadmium (Cd2+) and lead (Pb2+) were removed by the synthesized aragonite from synthetic wastewater. The influence of initial solution pH, contact time, Cd2+ and Pb2+ concentration, and sorbent dosage were evaluated. The major sorption was observed in the first 100 mins and 360 mins for Pb2+and Cd2+ respectively reaching sorption equilibrium at 720 mins (12 hr). The sorption capacity toward Pb2+ was much higher than toward Cd2+. Both heavy metals displayed high sorption capacities at initial pH 6. The pseudo-second-order kinetic model fits well with the experimental data with a higher correlation coefficient R2. Two isotherm models were also evaluated for the best fit with the experimental data obtained. Langmuir isotherm best fits the sorption of the metals on aragonite synthesized from eggshells. X-ray diffraction (XRD) and Scanning electron microscopy (SEM) results of sorbent after sorption showed that the mechanism of sorption was dominated by surface precipitation. Therefore, aragonite crystals synthesized from waste eggshells can be a potential substitute source for the removal of Cd2+ and Pb2+ from contaminated water.

INVESTIGATION OF VARIOUS WAYS TO STABILIZE LACTIC ACID BACTERIA CELLS DURING LONG-TERM STORAGE

2020 ◽  
pp. 388-389
Author(s):  
Yu. Nikolaev ◽  
R. Ulanova ◽  
I. Shakir ◽  
A. Khreptugova
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
Lactic Acid Bacterium ◽  
Enterococcus Faecium ◽  
Term Survival ◽  
Long Term Survival ◽  
Long Term Storage ◽  
Term Storage

Various methods of stabilizing the cells of the lactic acid bacterium Enterococcus faecium during long-term storage were studied. It is shown that the long-term survival of E. faecium is promoted by the addition of Enterosgel, Polysorb, the use of LB substratum, as well as their immobilization in humic-silanol gel.

scholarly journals Removal of aqueous Cu2+ ions with Fe0/C ceramsites fabricated by direct reduction roasting of magnetite, coal, and paper mill sludge

2018 ◽  
Vol 78 (8) ◽  
pp. 1753-1761
Author(s):  
Pingfeng Fu ◽  
Zihao Chen ◽  
Tianwen Yang
Keyword(s):  
Direct Reduction ◽  
Paper Mill ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Reduction Roasting ◽  
Mass Ratio ◽  
Solution Ph ◽  
Paper Mill Sludge ◽  
X Ray ◽  
Initial Ph

Abstract The porous metallic iron/carbon (Fe0/C) ceramsites, with virtues of low cost and ‘green’ fabrication, were prepared by direct reduction roasting of magnetite, coal, and paper mill sludge. The X-ray diffraction data revealed that Fe0 was generated in situ by reducing the magnetite at 1,200 °C. Scanning electron microscopy with energy-dispersive X-ray spectroscopy indicated that Fe0 particles, with a size of <10 μm, were highly dispersed on carbon particles to form an integrated anode (Fe0) and cathode (C) structure of microelectrolysis filters. The effects of initial solution pH and Fe/C mass ratio on Cu2+ removal were investigated. The extent of Cu2+ removal increased from 93.53% to 99.81% as initial pH rose from 2.5 to 7.0. The residual Cu2+ concentration was as low as <0.2 mg/L. The highest extent of Cu2+ removal was achieved at Fe/C mass ratio of 6.8:1. The pseudo-second-order kinetic model fitted well for Cu2+ removal by the ceramsite, revealing the chemisorption as a limiting step. The Cu2+ adsorption equilibrium data were well described by the Langmuir isotherm, with a maximum adsorption capacity of 546.45 mg/g at initial pH 3.0.

Lead removal from aqueous solutions by natural Greek bentonites

Clay Minerals ◽  
2013 ◽  
Vol 48 (5) ◽  
pp. 771-787 ◽  
Author(s):  
A. Bourliva ◽  
K. Michailidis ◽  
C. Sikalidis ◽  
A. Filippidis ◽  
M. Betsiou
Keyword(s):  
Kinetic Model ◽  
Metal Ion ◽  
Measurement Techniques ◽  
Ion Concentration ◽  
Area Measurement ◽  
Lead Removal ◽  
Order Kinetic ◽  
Solution Ph ◽  
Intra Particle Diffusion ◽  
Order Kinetic Model

AbstractThree bentonite samples (B1, B2, B3) from Milos Island, Greece, were investigated by XRD, AAS, DTA-TG, FTIR and specific surface area measurement techniques. A laboratory batch study has been performed to investigate the adsorption characteristics of lead ions (Pb2+) onto natural bentonite samples. The effect of various physicochemical factors that influence adsorption, such as solution pH (2–6), adsorbent dosage (1–10 g L–1), contact time (20–360 min), and initial metal ion concentration (5–150 mg L–1) was studied. A number of available models like the Lagergren pseudo first-order kinetic model, the pseudo second-order kinetic model and intra-particle diffusion were utilized to evaluate the adsorption kinetics. The adsorption of Pb2+ was modelled with the Langmuir, Freundlich and D-R isotherms. The maximum Pb2+ adsorption capacities for B1, B2 and B3 were 85.47 mg g–1, 73.42 mg g–1 and 48.66 mg g–1, respectively.

scholarly journals Complete Genome Sequence of Enterococcus faecium QU50, a Thermophilic Lactic Acid Bacterium Capable of Metabolizing Xylose

2019 ◽  
Vol 8 (21) ◽  
Author(s):  
Kiyotaka Abe ◽  
Yu Kanesaki ◽  
Mohamed Ali Abdel-Rahman ◽  
Satoru Watanabe ◽  
Takeshi Zendo ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacterium ◽  
Genome Sequence ◽  
Complete Genome Sequence ◽  
Enterococcus Faecium ◽  
Complete Genome ◽  
Circular Chromosome ◽  
Content Type ◽  
Egyptian Soil

Herein, we report the complete genome sequence of Enterococcus faecium QU50, isolated from Egyptian soil and exhibiting intermediate susceptibility to vancomycin. The genome contains a 2,535,796-bp circular chromosome and two plasmids of 196,595 bp and 17,267 bp.

scholarly journals Biosorption of lead ions by cyanobacteria Spirulina platensis: kinetics, equilibrium and thermodynamic study

2017 ◽  
Vol 16 (2) ◽  
pp. 105-112 ◽  
Author(s):  
Inga Zinicovscaia ◽  
Nikita Yushin ◽  
Elena Rodlovskaya ◽  
Inna Kamanina
Keyword(s):  
Spirulina Platensis ◽  
Metal Removal ◽  
Lead Ions ◽  
Batch Adsorption ◽  
Lead Removal ◽  
Order Kinetic ◽  
Adsorption Mode ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Biomass Dosage

Abstract The potential use of dry Spirulina platensis biomass to remove lead ions from aqueous solution was investigated. Effects of various parameters such as contact time, temperature, dosage of biosorbent, initial pH, and initial concentration of lead were investigated in the batch adsorption mode. The highest lead removal of 5.7 mg/g was obtained at pH 5, biomass dosage of 0.5 g, initial lead concentration of 60 mg/L. The Langmuir and Freundlich models fit the experimental data (R2 > 0.99), while the kinetic data was best described using the pseudo second-order kinetic model (R2 > 0.99). FTIR spectra indicated that the metal removal takes place through binding to OH, C=O and P=O groups. Lead was efficiently recovered from biomass by mineral acids, while using CH3COOH and NaOH as eluents the biomass maintained high biosorption capacity during three cycles. This study demonstrates the potential of using Spirulina platensis as biosorbent to remove lead from industrial wastewater.

scholarly journals Enhancing the Removal of Sb (III) from Water: A Fe3O4@HCO Composite Adsorbent Caged in Sodium Alginate Microbeads

Processes ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 44 ◽  
Author(s):  
Jun Zhang ◽  
Renjian Deng ◽  
Bozhi Ren ◽  
Mohammed Yaseen ◽  
Andrew Hursthouse
Keyword(s):  
Sodium Alginate ◽  
Large Scale ◽  
Diffusion Reaction ◽  
Order Kinetic ◽  
Solution Ph ◽  
Composite Adsorbent ◽  
Practical Applications ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Ph Range

To remove antimony (Sb) ions from water, a novel composite adsorbent was fabricated from ferriferous oxide and waste sludge from a chemical polishing process (Fe3O4@HCO) and encapsulated in sodium alginate (SAB). The SAB adsorbent performed well with 80%–96% removal of Sb (III) ions within a concentration range of 5–60 mg/L. The adsorption mechanism of Sb (III) was revealed to be the synergy of chemisorption (ion exchange) and physisorption (diffusion reaction). The adsorption isotherms and kinetics conformed to the Langmuir isotherm and the pesudo-second-order kinetic model. Both initial pH and temperature influenced the adsorption performance with no collapse of microbeads within solution pH range 3–7. Most importantly for practical applications, these microspheres can be separated and recovered from aqueous solution by a magnetic separation technology to facilitate large-scale treatment of antimony-containing wastewater.

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