CeO2/ZnO-based photocatalytic materials were synthesized by the sol-gel method in order to establish heterojunctions that increase degradation efficiency of some types antibiotics preventing recombination electron-hole pairs. The analysed XRD, SEM, EDAX, FTIR, and UV-Vis. After several tests, optimal concentration catalyst was determined be 0.05 g‧L-1 0.025 for chlortetracycline ceftriaxone. CeO2/ZnO assemblies showed much better compared ZnO or CeO2 tested individually. Sample S3 shows good...

Ag-Pd and Au-Pd (alloyed or core-shell) catalysts were synthesised by radiolytic reduction (gamma rays electron beam). Selective hydrogenation of buta-1,3-diene was performed with these different nanoparticles deposited on alumina in order to investigate composition structure effects catalytic performances. exhibit very behaviours: whereas only activity is modified systems without any change selectivity toward butenes formation, important variations into are observed for support.

TiO2 nanoparticles synthesized by the sol-gel method and doped with Ag were characterized SEM, EDAX, FTIR, BET, XRD TEM, then tested in photocatalytic degradation of methylene blue (MB) under UV irradiation. The experimental results indicate that average size raw particles was 10 nm, their increased calcination. MB on nanostructured TiO2-Ag shows a high efficiency upon addition photosensitizer. A parametric study process performed has revealed optimal value photocatalyst dose (0.3 g L−1) at...

Self-assembly by soft symmetry! We report the self-assembly of Pt nanoparticles into nanofibers from salts in very dilute aqueous solution or swollen liquid crystals (SLCs). The symmetry these SLC templates can be used to organize self-assemblies larger controlled shapes (fibers, as shown TEM image, lamellae).

A new catalytic mixture of nanosized dioxide (CeO 2 ) and zinc oxide (ZnO) powders have been synthesized by surfactant-assisted solvo-thermal route, characterized evaluated for photocatalytic activity.The prepared catalysts were TG, XRD, SEM EDAX methods.SEM analysis showed that the catalyst particles spheroidal shape their sizes range from 50 to 80 nm, organised as uniform distributed aggregates with large surface area, leading existence a number defects.The activity these materials was...

Some new coordination compounds of Cr(III) using as ligand N-hydroxy - succinimide, were obtained and studied. The combination ratio, central atom: 1:1; 1:2 1:3. complex studied UV-Vis spectroscopy, conductance pH measurements. studies obtaining stability the accomplished in aqueous solutions methods characteristic for compounds: ratios constants determined with solutions.

In this paper, the study of synthesis and stability in aqueous solutions new coordination compounds Ti(IV) Zr(IV) with ligand N-hydroxy-succinimide is presented.The salts: TiOSO 4 •2H 2 O ZrOCl •8H used for obtaining studied complexes, can derive from recycling metallic residues resulted mechanical technologies applied titanium zirconium S.C. ZIROM S.A. Giurgiu.The complexes were synthesized using specific methods compounds: UV-VIS spectroscopy, conductance pH-metric measurements.The molar...

The kinetics of the ion-exchange process with iron on pretreated analcime has been investigated in different conditions temperature, time and concentration exchange solution.The performances catalyst were analyzed using Table Curve software.The mathematical model corresponding to characteristic equation provides a good arrangement experimental points responding surface, simplicity determination coefficient that is near unity.

This study deals with the radiolytical decomposition of water molecules, in presence some catalysts, getting out hydrogen as unpolluting and cheaper energy vector.Instead spent nuclear fuel elements taken from power plants, irradiation source it was used 60 Co radionuclide having a specific activity 1.1 .10 5 Ci.It observed that radiolytic yield resulted molecular radiolysis catalysts decreased as: NH 4 -ZSM-5 > Pt 2+ -ZSM-5> 0 -MCM-41

In this paper the rheological behavior of three cold creams obtained in laboratory have been made, such as: simple cream, one cream with cinnamon extract and thuja extract. All a pseudo-plastic time-dependent behavior, also exhibiting velvety feeling being easily applied on skin. By adding alcoholic extracts thuja, became more fluid soft could be better.

The effect of storage time on the composition olive and sunflower oils has been investigated. It were studied parameters like free fatty acids (FFA), anisidine value (AV), iodine (IV), saponification number (SN) identification molecular structure through FT-IR method. During (48 months) an increasing in values FFA AV took place that measures oxidative degradation oils. stability oil stored at room temperature was less than oil. Also, significant differences found among during period.

Abstract In this paper, the synthesis and study of some coordination polymers Mn (II) with ligands derived from acids: dinaphtylphosphinic, dinaphtylthiophosphinic dinaphtyldithiophosphinic are presented. The was accomplished by refluxing in organic solvents reactants: acetylacetonate one respective phosphinic acids. Studies were performed applying following methods: chemical analysis, gel chromatography: IR-spectroscopy; ESR, X-ray diffraction, thermogravimetric analysis electrical...

In this work, we have dispersed SAPO-5 zeolite particles in polyurethane matrix for preparation of porous mixed membranes. The goal work is the determination cohesive energy density unfilled- and - filled Experimental values prepared membranes obtained by measuring swelling coefficients water several alcohols (methanol, ethanol, propanol butanol). solubility parameters are also calculated. For unfilled corresponded parameter increase comparison to those All tested show a tendency swell with ethanol.

A polycrystalline CeO2-ZnO catalyst was prepared by using a hydrothermal procedure in order to improve the structural properties.This material then used remove organic pollutants from aqueous solutions means of photocatalysis.The structural, morphological and optical properties as-prepared materials were characterized several techniques, such as UV-visible spectroscopy, SEM, FTIR, XRD.The SEM analysis shows that crystallite size sample varies range 0.3-2m.The photocatalytic activity under...

The sonolytic degradation of cyanide ions (CN -) in the presence two oxidising agents: hydrogen peroxide and atmospheric oxygen was investigated order to emphasise influence initial value pH on efficiency process.The results prove that has a significant only process involving as oxidant.This observation suggests oxidation with sonic field is most convenient method for destruction: high efficiency, no chemicals required adjustment necessary.

The paper presents the surfactant-assisted solvo-thermal route to synthesize nanoparticles of cerium oxide with different shape and morphology.The precursor was calcined at 400°C for 4 h in order obtain CeO 2 nanoparticles.The obtained samples were characterized by means thermal analysis FTIR spectroscopy.The UV-Vis used study optical properties.The morphologies nano-structures scanning electron microscopy (SEM) XRD.It found that nature concentration template agents played important roles...

Laccase - based biosensors are important for the selective determination of phenolic compounds in environmental matrices. The features enzyme immobilisation process and characteristics inorganic porous matrix adsorbed on electrode surface both establishing biosensor performances. This work presents synthesis physical-chemical new hybrid materials iron containing layered double hydroxides / laccase. XRD TGA-DTA analyses give information about structural thermal behaviour tested hybrids. SEM...

Two different methods of preparation (solid state exchange and aqueous exchange) with two iron precursors (ferrous chloride, respectively ferric oxalate) have been used to introduce species in the zeolite ZSM-5.A special attention was devoted method.The catalysts thus prepared were tested for direct N 2 O decomposition.The results catalytic tests show that Fe-ZSM-5 catalyst by oxalate solutions is much more active than one solid exchange.