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Wyszukujesz frazę "Membranes" wg kryterium: Temat


Wyświetlanie 1-13 z 13
Tytuł:
Preparation and physicochemical characterisation of ceramic supports for suported liquid membranes
Autorzy:
Cichowska-Kopczynska, I.
Joskowska, M.
Wojciechowska, A.
Aranowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/109638.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
glass cullet
recycling
porous material
membranes
Opis:
Supported liquids membranes are very promising products. They have been intensively inves-tigated in last two decades and widely used in many technologies especially in gas separation and purifi-cation processes. A key aspect in obtaining satisfying effectiveness and long membrane lifetime is a proper choice of ionic liquid and polymeric or ceramic support. Properties of both affect the processes of obtaining useful supported ionic liquid membranes. In comparison to polymeric membranes, ceramic ones are slightly thicker, however they are thermally and mechanically more stable. Our research was aimed at sintering fine glass particles of 500 to 45 μm in size in order to prepare porous membranes which can be used as supports for liquid membranes. Dextrin and borax were used as pore-making agents. The membranes, as disks 35 mm in diameter and 3 mm of thickness, were prepared. The porosity was determined using absorption method. It was found, that the porosity could be controlled by changing the applied pressure from 1 to 5 MPa, particle size distribution, sintering temperature, type and amount of pore-enhancing agents.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 1; 287-300
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of Co from Ni and Li from chloride media using polymer inclusion membrane system with thiosalicylate based ionic liquid
Autorzy:
Pospiech, Beata
Powiązania:
https://bibliotekanauki.pl/articles/2175434.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
cobalt
lithium
Ionic liquids
polymer inclusion membranes
Opis:
The selective removal of cobalt(II) from aqueous chloride solutions containing nickel(II) and lithium(I) was studied. The facilitated transport of metal ions through polymer inclusion membranes (PIMs) with trihexyl(tetradecyl)phosphonium thiosalicylate [PR4][TS] under various conditions was analyzed. In order to optimize the separation process, several factors such as the ion carrier concentration in the membrane as well as of the effect of the concentration of the acids in the source/receiving phases were investigated. The results show that PIM containing 25% CTA as the polymer support, 40% NPOE as the plasticizer and 35% [PR4][TS] allow the selective recovery of more than 90% of cobalt(II) from 6 mol/dm3 hydrochloric acid into 0.5 mol/dm3 sulfuric acid.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 152997
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of lead(II) and copper(ii) by plasticizer membranes with sulphur ana-logus of phosphinic acids as carriers
Autorzy:
Kolodziejska, M.
Kozlowski, C.
Ulewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/110836.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
plasticizer membranes
organophosphorous acids
lead(II)
copper(II)
Opis:
Investigation of selective removal of Pb(II) and Cu(II) from acidic nitrate aqueous solutions using transport across polymer inclusion membranes PIMs was performed. The sulphur analogus of phosphinic acids, i.e. bis(2,4,4-trimethylpentyl)monothiophosphinic acid (1) and tert-butyl(phenyl)- phosphinothioic acid (2) as well as their mixture were incorporated into polymer inclusion membranes composed of cellulose triacetate as a support and o-nitrophenyl octyl ether as a plasticizer. In the experi-ments the transport of Cu(II) across PIM with 1 was rapid and complete, however the lead(II) removal increased with increased membrane saturation. Selective transport of Cu(II) over Pb(II) through PIMs with binary carrier system (1 + 2) was observed; the selectivity order was: Cu(II) >> Pb(II). At tempera-ture of 50C the selectivity coefficient Cu(II)/Pb(II) for membrane with binary carriers was the highest and was equal to 758.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 1; 267-276
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective removal of Ag(I) and Cu(II) by plasticizer membranes with n-(diethylthiophosphoryl)-aza[18]crown-6 as a carrier
Autorzy:
Kolodziejska, M.
Kozlowski, C.
Kozlowska, J.
Ulewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/110729.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
plasticizer membranes
lariat ether
separation
silver(I)
copper(II)
Opis:
The competitive transport of equimolar mixtures of Ag(I) and Cu(II) ions from aqueous source phase (cMe = 0.001 mol/dm3) across polymer inclusion membranes PIMs with N-(diethylthiophosphoryl)aza[18]crown-6 as ion carriers, was studied. The influence of pH of source phase and metal concentration on an efficiency of silver(I) transport through polymer inclusion membranes containing cellulose triacetate as the support and o-nitrophenyl pentyl ether as the plasticizer was studied. The transport selectivity order for the PIM with N-(diethylthiophosphoryl)-aza[18]crown-6 was: Ag(I) >> Cu(II). The metal cations transport rate can be explained by size and nature of substituent in lariat ether molecule, which prefer formation of Ag(I) complex in the membrane phase.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 1; 237-247
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of palladium(II) from aqueous chloride solutions with cyphos phosphonium ionic liquids as metal ion carriers for liquid-liquid extraction and transport across polymer inclusion membranes
Autorzy:
Regel-Rosocka, M.
Rzelewska, M.
Baczynska, M.
Janus, M.
Wisniewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/109722.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
palladium(II)
phosphonium ionic liquids
polymer inclusion membranes
liquid-liquid extraction
Opis:
This paper presents an application of three phosphonium ionic liquids for removal of Pd(II) ions from aqueous chloride solutions with liquid-liquid extraction and transport across polymer inclusion membranes (PIM). Trihexyl(tetradecyl)phosphonium chloride and bromide (Cyphos IL 101 and 102) and bis-(2,4,4-trimethylpentyl)phosphinate (Cyphos IL 104) were investigated as carriers of Pd(II) from aqueous chloride media. Extraction of Pd(II) with Cyphos IL 102 has not been previously described in the literature. Cyphos IL 102 used for the first time as metal ion carrier, efficiently extracts palladium(II) ions both with liquid-liquid extraction and PIM. NaCl concentration does not affect Pd(II) extraction with Cyphos IL 102, while increasing HCl content in the feed aqueous phase causes decrease in extraction efficiency. Stripping of Pd(II) with 0.5 M NH4OH is efficient (84 to 90%) and the organic phase after stripping could be reused for extraction. For PIM transport the highest values of the normalized initial flux are obtained for CTA membrane containing Cyphos IL 101 and a receiving phase: mixture 0.1 thiourea + 0.5 M HCl. It is indicated that initial flux does not determine the final result of the transport through the membranes because from the separation point of view, the most important is a complete transport of the solute to the receiving phase, described by the Pd(II) recovery factor.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 621-631
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of cobalt from nickel using novel ultrasound-prepared supported liquid membranes containing Cyanex 272 as carrier
Autorzy:
Leon, G.
Martinez, G.
Leon, L.
Guzman, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/109879.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
cobalt
nickel
separation
supported liquid membranes
ultrasound
facilitated counter-transport
Cyanex 272
Opis:
The demand for cobalt has increased significantly in recent years due to its use in a wide variety of products and processes. Cobalt and nickel often accompany each other in nature and close physicochemical properties of both metals make their separation a complicated practical problem. Organophosphorous extractants have been widely used to separate cobalt from nickel. This paper presents the preliminary results obtained for separation of cobalt from nickel using Cyanex 272 containing supported liquid membranes prepared by a novel ultrasound-assisted method. The results show that this novel supported liquid membrane preparation method leads to higher separation factors than those described in the literature under similar separation conditions.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 77-86
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the effluent polishing plant using a ultrafiltration membrane installed at a palm oil mill
Autorzy:
Abdul Hadi, Numan
Hawari, Yahaya
Ngatiman, Muzzammil
Jalani, Nor Faizah
Wahab, Noorshamsiana Abdul
Halim, Rohaya Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/208299.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
BOD
palm oil mill
wastewater treatment
ultrafiltration membranes
BZT
olej palmowy
oczyszczanie ścieków
membrany ultrafiltracyjne
Opis:
Palm oil mills discharge raw effluent with high biochemical oxygen demand (BOD) of about 25 000 mg O2/dm3 . Conventional effluent treatment system uses ponds with a long hydraulic retention time of about 55–85 days, but the reduction of BOD is usually halted at 100–250 mg O2/dm 3. Further reduction of BOD to below 20 mg O2/dm3 to meet regulation requirement needs further advanced treatment. This study evaluates the efficiency of an effluent polishing plant installed at a palm oil mill targeting final effluent BOD below 20 mg O2/dm3. Characteristic of the incoming and treated effluent, dissolved oxygen in the aeration ponds and the effluent flow rate of the treatment plant have been determined. Due to low process throughput at the mill, the polishing plant operated at only 60% of its designed capacity. Treatment of effluent showed reduction of BOD from 39.3±5.8 to 6.1±3.8 mg O2/dm3, i.e., a reduction by 80–94%. Colour – a newly proposed regulation parameter – was reduced from 1081±69 to 845±60 ADMI, i.e., by 11–30%. This study indicates that while the treatment of effluent to reduce the BOD to below 20 O2/dm3 O2/dm3 is feasible, reduction of colour to less than 100 ADMI is not achievable.
Źródło:
Environment Protection Engineering; 2019, 45, 1; 155-170
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-penetrating very deep sclerectomy with a hydrophobic polymer implant in a rabbit model
Autorzy:
Leszczyński, R.
Stodolak-Zych, E.
Gumuła, T.
Wieczorek, J.
Kosenyuk, Y.
Pawlicki, K.
Błażewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/307465.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
jaskra
polimery
biomateriały
NPVDS
glaucoma
biocompatible polymers
polymer membranes
non-penetrating very deep sclerectomy
rabbit model
Opis:
Purpose: The aim of the study was to evaluate the influence of an implant made of a terpolymer (PTFE-PVDF-PP) on the condition of rabbit eyes during a one year observation period. Methods: The implant in the shape of an equilateral triangle (3 mm side length) was manufactured from a thin hydrophobic porous membrane. There were evaluated 40 eyes of 20 rabbits. The animals had non-penetrating very deep sclerectomy (NPVDS) performed, with insertion of an implant in the form of a triangular thin membrane. The control group consisted of 20 eyes where the animals had NPVDS performed without implant insertion. The evaluations included the study of the anterior part of the eye together with photographic documentation. Histopathological examination of the eyes 52 weeks after NPVDS procedure has been made. The process of wound healing was comparable in both groups. Results: The evaluation of the rabbits did not reveal any acute process of intraocular inflammation. After 12 month period of observation, no statistically significant differences in the process of wound healing or status of eyes were found between the groups. An analysis of fibrous connective tissue attachment to the implant showed that its layer was not thick and did not differ significantly from the control. The procedure of very deep sclerectomy and insertion of a polymer implant were well tolerated by the rabbit eyes. Conclusions: The in vivo results indicate that the hydrophobic implant in the form of a membrane can serve as a sclera implant after further study.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 3; 23-31
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of modified coal through chemical activation process on performance of heterogeneous reverse osmosis membranes
Autorzy:
Thaçi, B.
Gashi, S.
Daci, N.
Daci, M.
Dylhasi, A.
Powiązania:
https://bibliotekanauki.pl/articles/207269.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chemical activation
coal
membranes
reverse osmosis
wastewater treatment
reverse osmosis treatment
aktywacja chemiczna
węgiel
membrany
odwrócona osmoza
oczyszczanie ścieków przemysłowych
Opis:
Heterogeneous reverse osmosis (RO) membranes have been prepared from cellulose acetate (CA) and modified coal through chemical activation. Nitric acid of various concentrations, sulfuric and acetic acids used for various time periods have been studied with respect to modification of structure of coal and consequently structure of RO membranes. The effect of these variables on the modification of coal was examined by IR spectroscopy. All membranes prepared in such a way showed improved performance in comparison with standard CA membranes. The volume flux of the best RO membranes at 94% level of solute separation was 3.87×10–2 m3/(m2·h) at 1.76 MPa using aqueous feed solution 400 mg/dm3 of sodium chloride. The performance improvement was related to increases of charge of groups of coal particles in the membrane, affecting their rheology and morphology resulting in better membrane productivity. The SEM of some membranes have also been presented. These membranes were tested also with 1:1, 1:2, 2:2 and 1:3 inorganic salt solutions. The agreement between the calculated and experimental data of solute separation for studied solutes was reasonably good.
Źródło:
Environment Protection Engineering; 2015, 41, 1; 53-65
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of pH on permeability of ceramic membranes and selectivity in ultrafiltration of model BSA and myoglobin solutions
Autorzy:
Gabriel-Półrolniczak, U.
Szaniawska, D.
Ćwirko, K.
Powiązania:
https://bibliotekanauki.pl/articles/207905.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ultrafiltration
ceramic membranes
membrane permeability
bovine serum albumin
BSA
myoglobin
microfiltration
ultrafiltracja
membrany ceramiczne
przepuszczalność błony
albumina surowicy bydlęcej
albumina (BSA)
albuminy surowicy
mioglobina
mikrofiltracja
Opis:
The results of ultrafiltration tests carried out with model BSA and myoglobin solutions using ceramic 50 and 150 kDa membranes have been presented. Membrane permeability and selectivity were investigated in function of pH, transmembrane pressure (TMP) as well as molecular modelling data for proteins such as size, geometrical parameters and pH of minimal free energy of folding. The study has shown that the permeate flux J(v) depends on TMP, whereas the protein rejection is mainly influenced by pH. The results demonstrated that molecular modelling data are not sufficient to explain the membrane behaviour and the membrane–protein charge interactions and fouling effects must be also considered to explain the rejection mechanisms.
Źródło:
Environment Protection Engineering; 2014, 40, 4; 135-141
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unit and integrated membrane operations for purification of spent single-phase detergent
Autorzy:
Kowalska, I.
Powiązania:
https://bibliotekanauki.pl/articles/207300.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
membranes
purification
dairy industry
cleaning of process equipment
purification techniques
feed solutions
purification of spent
cleaning baths containing detergents
dairy effluent
membrany
przemysł mleczarski
czyszczenie sprzętu technologicznego
techniki oczyszczania
detergenty
ścieki z przemysłu mleczarskiego
Opis:
Unit and integrated membrane operations were investigated for purification of a spent alkaline single-phase detergent from a CIP system in a milk production plant. The filtration experiments were performed in a concentration mode with the use of UF and NF modules differing in their configuration, MWCO, and polymer material. The performance of the modules was characterised in terms of their retention characteristics, hydraulic efficiency, and tendency to fouling. The results revealed that unit and integrated membrane processes were suitable for the recovery of spent cleaning baths containing single-phase detergents, and the permeates maintained their basic cleaning properties. Due to the greater selectivity of the NF module, integrated membrane operations resulted in a much greater modification of the composition of the single-phase detergent in comparison with unit UF processes.
Źródło:
Environment Protection Engineering; 2015, 41, 4; 61-70
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of pesticides and inorganic pollutants by reverse osmosis
Autorzy:
Šír, M.
Podhola, M.
Patočka, T.
Honzajková, Z.
Kocurek, P.
Bystrianský, M.
Vurm, R.
Kubal, M.
Powiązania:
https://bibliotekanauki.pl/articles/207770.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
groundwater
groundwater pollution
pesticides
reverse osmosis
water treatment
batch process
chlorinated pesticides
inorganic pollutants
polyamide membranes
wody gruntowe
zanieczyszczenie wód gruntowych
pestycydy
odwrócona osmoza
uzdatnianie wody
proces wsadowy
chlorowane pestycydy
zanieczyszczenia nieorganiczne
membrany poliamidowe
Opis:
Contamination of soil and groundwater with pesticides is mainly caused by old ecological burdens. This study focuses on the treatment of groundwater contaminated with chlorinated pesticides. The contaminants mainly include α-HCH, β-HCH, γ-HCH, HCB, DDE, DDD and DDT. Reverse osmosis technology using RO98pHt polyamide membranes was used to remove the pollutants under batch process conditions. The observed rate of removal ranged from 98.4% to 99.7%. Total dissolved content solids decreased from 1.35 g/dm3 to below 0.05 g/dm3.
Źródło:
Environment Protection Engineering; 2015, 41, 2; 159-166
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of the water composition on the degradation kinetics of natural organic matter in photocatalytic membrane reactors
Autorzy:
Rajca, M
Powiązania:
https://bibliotekanauki.pl/articles/208135.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
water hardness
biological materials
bioreactors
degradation
deionized water
kinetics
membranes
rate constants
surface water
first order reactions
natural organic matters
photocatalytic process
twardość wody
materiały biologiczne
bioreaktory
degradacja
woda dejonizowana
kinetyka
membrany
stałe szybkości
wody powierzchniowe
reakcje pierwszego rzędu
naturalne substancje organiczne
proces fotokatalityczny
surface waters
Opis:
Decomposition kinetics of natural organic substances during the photocatalytic process with a semi-conductor TiO2 has been investigated. In the study, a laboratory reactor Heraeus and in a photocatalytic membrane reactor were used. Simulated solutions of deionized water, surface water and fulvic acids, differing in composition, were tested in the experiment. In order to determine reaction rate constants, the Langmuir–Hinshelwood kinetic model based on the first order reaction was applied. It was found that photocatalytic process enabled effective degradation of natural organic substances although its run was affected by inorganic ions, mainly those producing water hardness, present in water.
Źródło:
Environment Protection Engineering; 2015, 41, 1; 29-39
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-13 z 13

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