The preparation of membranes from polymer solutions by the phase inversion method, immersion—precipitation technique has proved since beginning obtaining technological most versatile and simple possibility to create polymeric membrane nanostructures. Classically, involves four essential steps: Preparation a solution in desired solvent, formation film on flat support, immersion coagulation bath containing solvents, conditioning. All stages are important for prepared membrane’s nanostructure...

The unpleasant odor that appears in the industrial and adjacent waste processing areas is a permanent concern for protection of environment and, especially, quality life. Among many variants removing substance traces, which give an smell to air, membrane-based methods or techniques are viable options. Their advantages consist installation simplicity scaling possibility, selectivity; moreover, flows odorous substances direct, automation complete by accessible operating parameters (pH,...

Membrane materials with osmium nanoparticles have been recently reported for bulk membranes and supported composite membrane systems. In the present paper, a catalytic material based on dispersed in n-decanol (nD) or n-dodecanol (nDD) is presented, which also works as an emulsion membrane. The hydrogenation of p-nitrophenol (PNP) carried out reaction separation column acid-receiving phase nanodispersion n-alcohols. variables PNP conversion process p-aminophenol (PAP) transport are follows:...

The present study introduces the process performances of nitrophenols pertraction using new liquid supported membranes under action a magnetic field. membrane system is based on dispersion silver–iron oxide nanoparticles in n-alcohols hollow microporous polypropylene fibers. iron oxide–silver are obtained directly through cyclic voltammetry electrolysis run presence soluble silver complexes ([AgCl2]−; [Ag(S2O3)2]3−; [Ag(NH3)2]+) and pure electrodes. nanostructured particles characterized...

The recovery and recycling of metals that generate toxic ions in the environment is particular importance, especially when these are tungsten and, particular, thorium. radioactive element thorium has unexpectedly accessible domestic applications (filaments light bulbs electronic tubes, welding electrodes, working alloys containing aluminum magnesium), which lead to its appearance electrical waste from municipal management platforms. current paper proposes simultaneous electrodes....

The membranes and membrane processes have succeeded in the transition from major technological biomedical applications to domestic applications: water recycling washing machines, of used cooking oil, recovery gasoline vapors pumping stations or enrichment air with oxygen. In this paper, neutralization condensation retention aluminum thermal power plants is studied using ethylene propylene diene monomer sulfonated (EPDM-S) containing magnetic particles impregnated a microporous hollow fiber...

Composite membranes play a very important role in the separation, concentration, and purification processes, but especially membrane reactors bioreactors. The development of composite has gained momentum through involvement various nanoparticles, polymeric, oxide, or metal, that have contributed to increasing their reactivity selectivity. This paper presents preparation characterization an active metal nanoparticle-support polymer type membrane, based on osmium nanoparticles obtained situ...

The separation, concentration and transport of the amino acids through membranes have been continuously developed due to multitude interest sources from which they must be recovered. At same time, types used in sepa-ration are most diverse: liquids, ion exchangers, inorganic, polymeric or composites. This paper addresses recuperative separation three (alanine, phe-nylalanine, methionine) using cellulosic derivatives polypropylene ma-trix. microfiltration (polypropylene hollow fibers) were...

Materials based on platinum metals with very good catalytic activity were tested in the reduction of p–nitrophenol (pNP) to p–aminophenol (pAP). The majority presented materials are adsorption surface catalyst simultaneously molecular hydrogen, coming from sodium borohydride an aqueous medium, which reduces it. In present paper, a material osmium dispersed n–decanol or n–dodecanol is presented, also works as emulsion membrane, for absorption and hydrogen at n–alcohol solution interface....

Liquid membranes based on nanoparticles follow a continuous development, both from obtaining methods and characterization of techniques points view. Lately, osmium have been deposited either flat membranes, with the aim initiating some reaction processes, or hollow fiber increasing contact surface phases membrane system. This paper presents obtainment liquid (Os-NP) dispersed in ndecanol (nDol) for realization system large between phases, but without using support. The dispersion n-decanol...

Hydrogen sulfide is present in active or extinct volcanic areas (mofettas). The habitable premises these are affected by the presence of hydrogen sulfide, which, even low concentrations, gives off a bad to unbearable smell. If living spaces considered closed enclosures, then system can be designed reduce concentration sulfide. This paper presents membrane way acceptable limits using cellulosic derivative-propylene hollow fiber based composite module. derivatives were...

The recovery of osmium from residual tetroxide (OsO4) is a necessity imposed by its high toxicity, but also the technical-economic value metallic osmium. An elegant and extremely useful method as membrane catalytic material, in form nanoparticles obtained on polymeric support. subject present study realization composite which matrix polypropylene hollow fiber, active component consists reducing an alcoholic solution tetroxides directly support based use 10-undecenoic acid (10-undecylenic...

Although a slightly radioactive element, thorium is considered very toxic because its various species, which reach the environment, can constitute an important problem for health of population. The present paper aims to expand possibilities using membrane processes in removal, recovery and recycling from industrial residues reaching municipal waste processing platforms. includes short introduction on interest shown this weak metal, followed by highlighting some common (domestic) uses. In...

This paper presents a transport and recovery of silver ions through bulk liquid membranes based on n-decanol using as carriers 10-undecylenic acid 10-undecylenyl alcohol. The across has been studied in the presence two types magnetic oxide nanoparticles obtained by electrochemical method with iron electrodes electrolyte without ions, which act promoters turbulence membrane. Separation alcohol were performed comparison lead ions. configuration separation module specially designed for chosen...

Liquid membranes usually have three main constructive variants: bulk liquid (BLM), supported (SLM) and emulsion (ELM). Designing hybrid variants is very topical, with the purpose of increasing flow substance through membrane but also improving selectivity. This paper presents operational limits some kind constituted as a which works by dispersing aqueous source (SP) receiving (RP) phases, itself being dispersion nanoparticles in an organic solvent (NP-OSM). The approached parameters were...

The bio-medical benefits of silver ions and 10-undecenoic acid in various chemical-pharmaceutical preparations are indisputable, thus justifying numerous research studies on delayed and/or controlled release. This paper presents the effect polymer matrix simultaneous release an aqueous medium pH ionic strength. study took into consideration polymeric matrices consisting cellulose acetate (CA) polysulfone (PSf), which were impregnated with oxide nanoparticles containing acid. studied iron...

Membranes are associated with the efficient processes of separation, concentration and purification, but a very important aspect them is realization reaction process simultaneously separation process. From practical point view, chemical reactions have been introduced in most membrane systems: on-liquid membranes, inorganic membranes or polymeric and/or composite membranes. This paper presents obtaining containing metallic osmium obtained situ. Cellulose acetate (CA), polysulfone (PSf)...

Regardless of the type liquid membrane (LM) (Bulk Liquid Membranes (BLM), Supported (SLM) or Emulsion (ELM)), transport and separation chemical species are conditioned by operational (OP) constructive design parameters (DP) permeation module. In present study, pH aqueous source phase (SP) receiving (RP) proposed system were selected as parameters. The mode contacting phases was chosen convective generator. experiments used BLM-type membranes with spheres in free rotation film contact...

Environmental problems occurring in isolated or hardly accessible inhabited areas can be adequately addressed using membranes and membrane processes.In the present paper, recuperative separation of aluminum ion from sulfate-treated water through permeation capillary composite membranes, polypropylene with ethylene propylene diene terpolymer sulfonic acid (PP / S-EPDM) inclusions is followed by reaction complexation 8-hydroxy quinoline. The installation used for studying process provides a...

In this paper the effect of nanofluid is studied in double pipe heat exchanger counter current flow, viscosity nanofluids are measured at different temperatures and particle sizes. SiO2 nanoparticles dispersed concentrations (0.2-2) % with sizes (50-25) nm base fluid water. The friction factor transfer coefficient calculated nanoparticle sizes, results showed that was increased as concentration increased. size decreased. particles decrease.

Hydrogen sulfide is present in active or extinct volcanic areas (mofettas). The habitable premises these are affected by the presence of hydrogen sulfide, which, even low concentrations, gives off a bad to unbearable smell. If living spaces considered closed enclosures, then system can be designed reduce concentration sulfide. This paper presents membrane-based way acceptable limits using cellulosic derivative–propylene hollow fiber-based composite membrane module. derivatives were:...

Thorium is a weak radioactive element, but the control of its concentration in natural aqueous systems great interest for health, because it toxic heavy metal. The present paper presents recovery thorium from diluted synthetic by nanofiltration. membranes used nanofiltration containing species are composites 4′-Aminobenzo-15-crown-5 ether (ABCE) and sulfonated poly–ether–ether–ketone (sPEEK). composite (ABCE–sPEEK) were characterized scanning...

Thorium is a weak radioactive element, but the control of its concentration in natural aqueous systems great interest for health, because it toxic heavy metal. The present paper presents recovery thorium from diluted synthetic by nanofiltration. membranes used nanofiltration containing species are composites 4′-Aminobenzo-15-crown-5 ether (ABCE) and sulfonated poly–etherether–ketone (sPEEK). composite (ABCE–sPEEK) were characterized scanning electron microscopy (SEM), energy-dispersive X–Ray...