Features of dissolved oil-product adsorption from industrial wastewater by a modified hydrophobic carbonate sludge are studied. The adsorption isotherm is obtained. The adsorption mechanism on the ...new sorbent is investigated as physical unactivated adsorption using thermodynamic and kinetic parameters. The Gibbs free energy (–(20.26–21.46) kJ/mol), isosteric heat of adsorption (0.9–1.17 kJ/mol), adsorption rate constants ((0.2–0.47)·10
–3
sec
–1
), and apparent activation energy (6.6–28.6 kJ/mol) are calculated. Adsorption under dynamic conditions is studied.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Immobilization of tetra-
tert
-butylphthalocyanine and its copper complex on a chemically activated surface of nonwoven polypropylene and Dacron materials was studied with the aim of creating new ...materials with antimicrobial properties. A method of the chemical activation of the surface of the studied materials by aminolysis was developed. It was shown that chemical activation leads to a change in the roughness of the polymer surface and formation of nitrogen-containing surface functional groups, which increases the sorption capacity of the studied materials. The modified non-woven materials exhibit a sustained antimicrobial activity.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
A large volume (4.8 m
3) liquid scintillator detector has been running in Hall C of the Gran Sasso Underground Laboratory since February 1995. This detector is called the “Counting Test Facility” ...(CTF). The main goal of the detector facility is the measurement of ultralow background levels in scintillators and the development of processes able to purify them at this level. The detector has been designed to have exceptional sensitivity using a variety of methods to identify backgrounds. With the CTF, records were achieved in the domain of low background large volume detectors. Limits of 3.5 ± 1.3 × 10
−16 g/g and 4.4
−1.2
+1.5 × 10
−16 g/g for the
238U and
232Th daughters, respectively, and 1.85 ± 0.13 ± 0.01 × 10
−18 for the isotopic abundance of
14C relative to
12C were obtained. These results are very encouraging and point towards the feasibility of low energy, real time scintillation detectors for solar neutrinos, such as Borexino.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Methods were developed for the synthesis of nitro derivatives of 5,15-diphenyl-3,7,13,17-tetramethyl-2,8,12,18-tetraethylporphyrin containing nitro groups at the meso positions of the porphyrin core ...and at the
para
positions of the phenyl substituents. The formation kinetics of the zinc, copper, and cobalt complexes of the resultant porphyrins in pyridine and in an acetic acid–benzene (7 : 3) mixed solvent was studied. It was found that the properties of the porphyrin ligands are determined both by the electronic effect of the nitro groups and by the effects of spatial distortion of the porphyrin core.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Macroheterocyles, such as porphyrins, phthalocyanines, and their coordination compounds, introduced into standard electrolytes for nickel plating and electroplating of Ni–Co and Ni–Fe alloys ...substantially improve the quality of coatings. The adsorption of 5,10,15,20-tetrakis(
N
-methylpyridyl-4')porphine tetratosylate on the surface of Ni is studied via ellipsometry and X-ray photoelectron spectroscopy (XPS).
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Copper and cobalt complexes of nitro derivatives of planar and nonplanar derivatives of 5,15-diphenyl- 3,7,13,17-tetramethyl-2,8,12,18-tetraethylporphyrin are synthesized and their stability in ...proton-donor media is investigated. It is established that the kinetic parameters of the dissociation reactions of copper and cobalt complexes of the studied porphyrins depends on the degree of deformation of the porphyrin macroring and the acceptor properties of NO
2
groups.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The methods of surface activation of nonwoven Dacron through aminolysis and the methods of immobilization of tetra-4-
tert
-butyl-, tetra-4-sulfo-, tetra-4-(carboxymethyl)phthalocyanines and their ...nickel, cobalt and copper complexes on activated materials are described. The state of the surface of the activated materials was studied by IR spectroscopy. Analysis of the electronic absorption spectra of the immobilized phthalocyanines revealed a monomolecular dispersion of tetra-4-
tert
-butyl-phthalocyanine and its complexes on the surface of nonwoven Dacron. By contrast, tetra-4-sulfo- and tetra-4-(carboxymethyl)phthalocyanines and their complexes are strongly associated. The catalytic activity of the obtained materials in the oxidation of sodium diethyldithiocarbamate with atmospheric oxygen was studied to find that the phthalocyanine ligands and their nickel and copper complexes are catalytically inactive. It was shown that the materials modified by the cobalt complexes accelerate the oxidation reaction 10–15 times.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
A 4.8 m
3 unsegmented liquid scintillation detector at the underground Laboratori Nazionali del Gran Sasso has shown the feasibility of multi-ton low-background detectors operating to energies as low ...as 250 keV. Detector construction and the handling of large volumes of liquid scintillator to minimize the background are described. The scintillator, 1.5 g PPO/L-pseudocumene, is held in a flexible nylon vessel shielded by 1000 t of purified water. The active detector volume is viewed by 100 photomultipliers, which measure time and charge for each event, from which energy, position and pulse shape are deduced. On-line purification of the scintillator by water extraction, vacuum distillation and nitrogen stripping removed radioactive impurities. Upper limits were established of < 10
−7 Bq/kg-scintillator for events with energies 250 keV <
E < 800 keV, and < 10
−9 Bq/kg-scintillator due to the decay products of uranium and thorium. The isotopic abundance of
14C
12C
in the scintillator was shown to be approximately 10
−18 by extending the energy window of the detector to 25–250 keV. The
14C abundance and uranium and thorium levels in the CTF are compatible with the Borexino Solar Neutrino Experiment.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The 5,15-diphenyl-3,7,13,17-tetramethyl-2,8,12,18-tetraethylporphyrin nitro derivatives containing the nitro groups in the
meso
-positions of the porphyn ring and/or
para
-positions of phenyl rings ...were synthesized. Porphyrins were characterized by electron absorption,
1
H NMR, and IR spectra. The purity and individuality of the synthesized compounds was proved by TLC and elemental analysis. Kinetic parameters of complexation reactions of the synthesized porphyrins with copper acetate in pyridine and in the mixed solvent benzene-acetic acid (7:3) depend on the degree of deformation of the tetrapyrrole cycle, on the solvation effects and electronic effects of the nitro groups.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
