Assessment of Arthrobacter viscosus as reactive medium for forming permeable reactive biobarrier applied to PAHs remediation

The aim of this paper was to establish the optimum parameters for the biosorption of Pb(II) by dead and living Arthrobacter viscosus biomass from aqueous solution. It was found that at an initial pH of 4 and 26 °C, the dead biomass was able to remove 97% of 100 mg/L Pb(II), while the living biomass removed 96% of 100 mg/L Pb(II) at an initial pH of 6 and 28 ± 2 °C. The results were modeled using various kinetic and isotherm models so as to find out the mechanism of Pb(II) removal by A. viscosus. The modeling results indicated that Pb(II) biosorption by A. viscosus was based on a chemical reaction and that sorption occurred at the functional groups on the surface of the biomass. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy coupled with energy dispersive X-ray microanalysis (SEM-EDX) analyses confirmed these findings. The suitability of living biomass as biosorbent in the form of a biofilm immobilized on star-shaped polyethylene supports was also demonstrated. The results suggest that the use of dead and living A. viscosus for the removal of Pb(II) from aqueous solutions is an effective alternative, considering that up to now it has only been used in the form of biofilms supported on different zeolites.

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Specialties of the structure and conductivity of the non-aqueous electrolytes based on alkali metal bis (salicyl) borates and bis (oxalate) borates

Ukrainian Chemistry Journal ◽

10.33609/0041-6045.85.3.2019.49-55 ◽

2019 ◽

Vol 85 (3) ◽

pp. 49-55

Author(s):

Viktor Diamant ◽

Volodymyr Trachevskii ◽

Katherine Pershina ◽

Volodymyr Ogenko ◽

Chen Donchu ◽

...

Keyword(s):

Electrical Conductivity ◽

Alkali Metals ◽

Electrochemical Impedance ◽

Integral Intensity ◽

Low Frequency ◽

Aqueous Electrolytes ◽

Thermal Dependence ◽

Spectra Analysis ◽

Reactive Medium ◽

Coordination Environment

The structure and coordination environment of non-aqueous electrolytes based on bis(salicyl)borates of lithium, sodium, potassium, tetramethylammonium (MeBSB) and bis(oxalato)borates from lithium to cesium (MeBOB) using NMR spectroscopy have been investigated. Bis(salicyl)borates (BSB) and bis(oxalate)borates (BOB) of alkali metals and organic cations are considered as promising electroconductive components of electrolytes of modern chemical sources of current (lithium, sodium ion batteries and super-capacitors). The salts were synthesized by the microwave radiation method. The 13C and 11B NMR spectra analysis determined the presence of symmetric structure in BOB anion and the presence of two optical conformations of the BSB anion with labile coordination environment of boron. The conformations of the BSB are the result of the ion contact pairs formation. In the case of tetramethylammonium cation the presence of conformations are depended on the reactive medium. The conformational lability of the coordination sphere of NaBSB dissolved in DMAA is connected with increasing of the integral intensity of carboxyl group singles relatively signals of carbon atoms in fragments of another functional affiliation when the time delay between radio frequencies varies within 2-15 seconds. The difference in the structure of these anions leads to a change in the thermal dependence of the electrical conductivity of BSB and the transport of ions in non-aqueous solvents. Maximum electrical conductivity of salt solutions in DMFA is achieved at close concentrations of 0.75 m for KBSB and 0.77-1 m for NaBSB. The solubility of BSB is better than the BOB. Based on the measurements of the conductivity and the data of electrochemical impedance spectroscopy (the angle of inclination of spectra in the Nyquist coordinates in the low frequency range, the phase angle shift at a frequency) it was proposed the existence of two ways of ions and charge transfer in the electrolytes: diffusion and relay transport. The possibility of formation of a labile salt complex with a solvent due to hydrogen bonds is established.

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A Polyol-Mediated Fluoride Ions Slow-Releasing Strategy for the Phase-Controlled Synthesis of Photofunctional Mesocrystals

Nanomaterials ◽

10.3390/nano9010028 ◽

2018 ◽

Vol 9 (1) ◽

pp. 28 ◽

Cited By ~ 1

Author(s):

Xianghong He ◽

Yaheng Zhang ◽

Yu Fu ◽

Ning Lian ◽

Zhongchun Li

Keyword(s):

Data Storage ◽

Simple Procedure ◽

Inorganic Compounds ◽

Cubic Phase ◽

Fluoride Ions ◽

Reactive Medium ◽

Α Phase ◽

Formidable Challenge ◽

Higher Temperature ◽

Rational Control

There are only a few inorganic compounds that have evoked as much interest as sodium yttrium fluoride (NaYF4). Its extensive applications in various fields, including transparent displays, luminescence coding, data storage, as well as biological imaging, demand the precise tuning of the crystal phase. Controlling the emergence of the desired α-phase has so far remained a formidable challenge, especially via a simple procedure. Herein, we represented a polyol-assisted fluoride ions slow-release strategy for the rational control of pure cubic phase NaYF4 mesocrystals. The combination of fluorine-containing ionic liquid as a fluoride source and the existence of a polyalcohol as the reactive medium ensure the formation of uniform α-phase mesocrystallines in spite of a higher temperature and/or higher doping level.

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Numerical solution of a nonsteady blast wave propagation in two-phase (“separated flow”) reactive medium

Journal of Computational Physics ◽

10.1016/0021-9991(81)90164-9 ◽

1981 ◽

Vol 39 (2) ◽

pp. 456-472 ◽

Cited By ~ 9

Author(s):

Shmuel Eidelman ◽

Alexander Burcat

Keyword(s):

Wave Propagation ◽

Numerical Solution ◽

Blast Wave ◽

Separated Flow ◽

Two Phase ◽

Reactive Medium ◽

Blast Wave Propagation

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The barrier and the antimicrobial properties of polylactide films covered with exopolysaccharide layers synthesized by Arthrobacter viscosus Właściwości barierowe i antymikrobowe folii polilaktydowej pokrytej egzopolisacharydem syntetyzowanym przez Arthrobacter viscosus

PRZEMYSŁ CHEMICZNY ◽

10.15199/62.2015.5.17 ◽

2015 ◽

Vol 1 (5) ◽

pp. 118-121 ◽

Cited By ~ 1

Author(s):

Małgorzata Mizielińsk

Keyword(s):

Antimicrobial Properties ◽

Arthrobacter Viscosus

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Structure of the extracellular bacterial polysaccharide from Arthrobacter viscosus NRRL B-1973

Canadian Journal of Chemistry ◽

10.1139/v68-552 ◽

1968 ◽

Vol 46 (21) ◽

pp. 3353-3361 ◽

Cited By ~ 40

Author(s):

J. H. Sloneker ◽

Danute G. Orentas ◽

C. A. Knutson ◽

P. R. Watson ◽

Allene Jeanes

Keyword(s):

Acid Hydrolysis ◽

Linear Structure ◽

Sugar Residue ◽

Hydroxyl Groups ◽

Bacterial Polysaccharide ◽

Sodium Metaperiodate ◽

Mannuronic Acid ◽

Arthrobacter Viscosus ◽

Hydrolysis Of

D-Glucose, D-galactose, and D-mannuronic acid in equimolar proportions constitute 75% of the weight of the polysaccharide elaborated by Arthrobacter viscosus NRRL B-1973. O-Acetyl groups account for the remaining 25% of the weight; 50% of the hydroxyl groups are acetylated. Acid hydrolysis of the polysaccharide revealed that the D-mannopyranosyluronic acid bonds hydrolyzed with unexpected ease. Controlled acid hydrolysis afforded three oligosaccharides identified as 4-O-β-D-glucopyranosyl-D-galactose; 4-O-β-D-mannopyranosyluronic acid-D-glucose; and O-β-D-mannopyranosyluronic acid-(1 → 4)-O-β-D-glucopyranosyl-(1 → 4)-D-galactose. The native polysaccharide was oxidized slowly by sodium metaperiodate and consumed 0.42 mole per sugar residue in 340 h at 4°. The deacetylated polysaccharide consumed 0.67 mole of periodate per sugar residue and produced 1 mole of acid per 160 to 165 sugar residues in 170 h at 4°. At 20° the deacetylated polysaccharide was oxidized excessively by periodate, 1.5 moles of oxidant was consumed, and 0.4 mole of acid was produced per sugar residue in 340 h. However, only 20% of the C4-substituted D-glucose residues in the polysaccharide was cleaved by periodate in spite of the excessive oxidation at 20°.The polysaccharide has a linear structure and consists predominantly of repeating trisaccharide units, O-β-D-mannopyranosyluronic acid-(1 → 4)-O-β-D-glucopyranosyl-(1 → 4)-D-galactose.

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Surprisingly small HONO emissions from snow surfaces at Browning Pass, Antarctica

Atmospheric Chemistry and Physics ◽

10.5194/acp-6-2569-2006 ◽

2006 ◽

Vol 6 (9) ◽

pp. 2569-2580 ◽

Cited By ~ 69

Author(s):

H. J. Beine ◽

A. Amoroso ◽

F. Dominé ◽

M. D. King ◽

M. Nardino ◽

...

Keyword(s):

Electron Transfer ◽

Organic Compounds ◽

Nitrous Acid ◽

Uv Light ◽

Transfer Reactions ◽

Snow Surface ◽

Reactive Medium ◽

Electron Transfer Reactions ◽

Fresh Snow ◽

Photochemical Modeling

Abstract. Measured Fluxes of nitrous acid at Browning Pass, Antarctica were very low, despite conditions that are generally understood as favorable for HONO emissions, including: acidic snow surfaces, an abundance of NO3- anions in the snow surface, and abundant UV light for NO3- photolysis. Photochemical modeling suggests noon time HONO fluxes of 5–10 nmol m-2 h-1; the measured fluxes, however, were close to zero throughout the campaign. The location and state of NO3- in snow is crucial to its reactivity. The analysis of soluble mineral ions in snow reveals that the NO3- ion is probably present in aged snows as NaNO3. This is peculiar to our study site, and we suggest that this may affect the photochemical reactivity of NO3-, by preventing the release of products, or providing a reactive medium for newly formed HONO. In fresh snow, the NO3- ion is probably present as dissolved or adsorbed HNO3 and yet, no HONO emissions were observed. We speculate that HONO formation from NO3- photolysis may involve electron transfer reactions of NO2 from photosensitized organics and that fresh snows at our site had insufficient concentrations of adequate organic compounds to favor this reaction.

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