109 research outputs found
Synthesis and application of zeolite and glass fiber supported zero valent iron nanoparticles as membrane component for removal nitrate and Cr (+6) ions
In the present paper the synthesis and characterization of zeolite and glass fiber supported zero valent iron
nanoparticles (Ze-ZVI, GF-ZVI NPs) are reported.ZVI, Ze-ZVI and GF-ZVI NPs size, composition and
morphology were characterized by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM),
Energy Dispersive Spectroscopy (EDS). Synthesized nanostructures were tested as reducing agents of nitrate
and hexavalent Chromium. Batch experiments were carried for revealing of efficacy of prepared nanomaterials
(ZE-ZVI NPs and GF-ZVI NPs). Nitrate removal efficiency (at initial concentration 50 mg/mL) was rapidly
increased from 26% to 76% for GF-ZVI NPs at 60-240 min time interval for and from 34% to 90% for ZE-ZVI
NPs at the same time interval.Also was studied the efficacy of prepared nanostructures ZE-ZVI and ZE-ZVI
NPs as membrane component with 5% of ZVI NPS weight contentfor the removal of nitrate from water
solution that made 85% for ZE-ZVI NPs and 76% for GF-ZVI NPs, respectively. The results of this study
indicate that the application of GF-ZVI and ZE-ZVI NPs as membrane component is advantageous because it
allows to prevent the additional pollution of treated solution caused by unreacted ZVI NPs
Role of structure of the Pp/magnetite nanocomposites on their thermal properties
The thermal degradation behaviour of polypropylene and its magnetite composites have been investigated by
differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Distribution of magnetite
nanoparticles in a polymer matrix has been studied by scanning and transmission electron microscopy and also
atomic force microscopy. The thermal and mechanical properties of nanocomposites based on polypropylene
and magnetite nanoparticles have also been investigated. It has shown that, the introduction of Fe3O4
nanoparticles in polypropylene increases its thermal stability of about 1000C. The maximum increase in the
thermal stability of PP was observed in the case of a 20% weight content of Fe3O4 nanoparticles in
polypropylene
Regularizing velocity differences in time-lapse FWI using gradient mismatch information
We present a method for recovering time-lapse velocity changes using full waveform inversion (FWI). In a preprocessing step we invert for a single intermediate model by simultaneously minimizing the data misfit in the baseline and the monitor surveys. We record the individual FWI gradients corresponding to the baseline and the monitor datasets at each iteration of the inversion. Regions where these gradients consistently have opposing sign are likely to correspond to locations of time-lapse change. This insight is used to generate a spatially varying confidence map for time-lapse change. In a subsequent joint inversion we invert for baseline and monitor models while regularizing the difference between the models with this spatially varying confidence map. Unlike double difference full waveform inversion (DDFWI) we do not require identical source and receiver positions in the baseline and monitor surveys
rac-(1R*,2S*,3S*)-Diethyl 4-methyl-2-phenyl-6-(2-phenylhydrazinylidene)cyclohex-4-ene-1,3-dicarboxylate
In the title compound, C25H28N2O4, the cyclohexene ring adopts a half-chair conformation and the dihedral angle between the aromatic rings is 59.44 (11)°. In the crystal, a weak intermolecular N—H⋯O hydrogen bond occurs
rac-1-(6-Hydroxy-3,6-dimethyl-4-phenyl-4,5,6,7-tetrahydro-2,1-benzoxazol-5-yl)ethanone
The structure of the title compound, C17H19NO3, is of interest with respect to antibacterial properties, antibiotic properties and biological activity. The structure displays intermolecular O—H⋯N hydrogen bonding
Ethyl 3,6-dihydroxy-6-methyl-4-phenyl-4,5,6,7-tetrahydro-1H-indazole-5-carboxylate monohydrate
In the title compound, C17H20N2O4·H2O, the cyclohexene ring adopts a half-chair conformation while the indazole ring is essentially planar [maximum deviation = 0.0192 (12) Å]. In the crystal, pairs of intermolecular O—H⋯N hydrogen bonds link the molecules into dimers lying about inversion centers and intramolecular O—H⋯O hydrogen bonds result in six-membered rings. The dimers are further connected by N—H⋯O and O—H⋯O hydrogen bonds
1-Methylamino-3-(2,4,6-trimethylphenyl)propan-2-ol
The methylaminopropyl chain in the title compound, C13H21NO, adopts an extended zigzag conformation and the N atom shows a trigonal coordination. The N atom acts as hydrogen-bond acceptor to the hydroxy group of an adjacent molecule, generating a helical chain running along the b axis. The amino H atom is not involved in hydrogen bonding
Poly[(μ3-rac-5-ethoxycarbonyl-6-hydroxy-6-methyl-4-phenyl-4,5,6,7-tetrahydrobenzo[c]isoxazol-3-olato)potassium]
The title compound, [K(C17H18NO5)]n, reveals the relative configuration (4R*,5S*,6R*) whereas its crystals are racemic. The cyclohexane ring adopts a half-chair conformation and the isoxazole ring has an envelope conformation. The ethyl fragment of the ethoxycarbonyl group at position 5 is disordered in a 0.547 (7):0.453 (7) ratio. The K+ ion is surrounded by five O atoms from three ligands at distances ranging from 2.606 (2) to 3.028 (2) Å, generating a three-dimensional network. The crystal packing displays intermolecular O—H⋯N and O—H⋯O hydrogen bonds in which the hydroxy group acts as a double proton donor
rac-Diethyl 6-hydroxy-4-[(2-hydroxyethyl)amino]-6-methyl-2-phenylcyclohex-3-ene-1,3-dicarboxylate
The title compound, C21H29NO6, is chiral with three stereogenic centres. The crystal is a racemate and consists of enantiomeric pairs with the relative configuration rac-(2R*,3S*,4R*). The ethyl fragment of the ethoxycarbonyl group at position 1 is disordered in a 0.60:0.40 ratio. The crystal packing displays intermolecular O—H⋯O hydrogen bonding. An intramolecular N—H⋯O hydrogen bond also occurs
rac-Diethyl 9-hydroxy-9-methyl-7-phenyl-1,4-diazaspiro[4.5]decane-6,8-dicarboxylate
The title molecule, C21H30N2O5, is chiral with four stereogenic centres. The crystal is a racemate and consists of enantiomeric pairs with the relative configuration rac-(6S*,7R*,8R*,9S*). The ethyl fragment of the ethoxycarbonyl group at position 6 is disordered in a 0.46 (3):0.54 (3) ratio. The crystal structure features intermolecular N—H⋯O. Intramolecular O—H⋯N and N—H⋯O hydrogen bonds also occur
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