Wyniki wyszukiwania - Biblioteka Nauki

1

Innovative Method for Water Deiron Ions Using Capillary Material

100%

Trus I. , Radovenchyk I. , Halysh V. , Chuprinov E. , Benatov D. , Hlushko O. , Sirenko L.

Journal of Ecological Engineering

|

2022

|

tom Vol. 23, nr 3

174--182

EN

Among all known inorganic pollutants of wastewater and natural water that adversely affect water bodies, different living organisms and human beings, iron compounds are the most common. Before discharging the wastewater into water bodies, it is important to remove iron ions from wastewater. The application of capillary materials in water and wastewater treatment is a promising direction of ecology and technology. The capillary properties of materials allow the development of quite simple, autonomous, highly efficient and energy-saving systems for water purification. The aim of the present paper was the investigation of the influence of the basic conditions of the filtration process with the application of capillary materia on the efficiency of iron ions removal. The initial concentration of the model solution, pH and temperature of the filtration process, as well as the contact area of the liquid phase with oxygen of the air were studied. The proposed method is appropriate for the treatment of water in the concentration range from 5 to 10 mg/dm3 with an optimum pH in the range of 4–7. The experimental data showed high efficiency of capillary materials application, providing sufficient removal of iron ions from low concentrated solutions, compared to the traditional method of precipitation. The main advantage of the capillary materials is the simplicity of their application, quite high degree of purification and there no need to consume electricity or additional reagents, which allows creating autonomous water treatment facilities and plants.

2

The effect of Al(III) and Fe(III) ions on the flotation behavior of Kfeldspar with sodium oleate as the collector

88%

Yi C. , Zhou J. , He G. , Hu H. , Liu C. , Yang J. , Lyu X.

Physicochemical Problems of Mineral Processing

|

2023

|

tom Vol. 59, iss. 6

art. no. 174724

EN

The present study investigates the effects and mechanisms of aluminum (Al(III)) and iron (Fe(III)) ions on the flotation efficiency of potassium feldspar (K-feldspar) within oleate collector systems. The study employs micro-flotation experiments, solution chemistry calculations, zeta potential measurements, and FT-IR and XPS analyses to demonstrate that Al(III) and Fe(III) ions can significantly improve the flotation recovery of K-feldspar by altering its surface charge, bonding properties, and adsorption modes. The study also develops adsorption models for the flotation of K-feldspar activated by Al(III) and Fe(III), revealing the synergistic impacts of metal ion hydrolysis products and sodium oleate in the formation of hydrophobic complexes.

3

Microbiological oxidation of the waste ferrous sulphate

75%

Nowaczyk K. , Juszczak A. , Domka F.

Polish Journal of Environmental Studies

|

1999

|

tom 08

|

nr 6

EN

The ferrous sulphate, which is a waste product in titanium white production at the Chemical Plant "Police" S.A., was subjected to microbiological oxidation with Thiobacillus ferrooxidans bacteria. The kinetic parameters of the culture growth were calculated on the basis of the Monod equation. The process was found to be best described by the model of the autocatalytic 1st order reaction with respect to the product and 1st order reaction with respect to the substrate. The effect of temperature and pH on the course of the process was studied. The kinetics of oxidation of ferrous ions coming from the waste ferrous sulphate was studied in the process with laboratory bacteria strain as well as the strain adapted to the waste product and compared with that of pure substrate oxidation. Analysis of the precipitates formed during microbiological oxidation of the waste ferrous sulphate proved that (NH4)Fe3(SO4)2(OH)6 with the admixture of NaFe3(SO4)2(OH)6 and KFe3(SO4)2(OH)6 are formed.

4

The influence of black currant [Ribes nigrum] seed extract on effectiveness of human ceruloplasmin in Fe[II] ions elimination

63%

Budzyn M. , Iskra M. , Wielkoszynski T. , Malecka M. , Gryszczynska B.

Journal of Elementology

|

2009

|

tom 14

|

nr 2

217-227

EN

Ions of irons, especially ferrous ions may be harmful for living organisms, because they generate reactive oxygen species like O2 •- or •OH. Probability of the risk rises especially in pathological conditions, in which high level of iron is observed. For this reason scientists try to establish new methods that can support organism in eliminating reactive ferrous ions. Nowadays, attention focuses on substances present in plants, especially polyphenols, whose administration prevents oxidative damages in iron overloading. This new approach requires some research on behavior of plant-derived compounds in human organism, within a system containing other biomolecules involved in iron metabolism. The aim of this study has been to investigate the influence of black currant (Ribes nigrum) seed extract, a source of polyphenols, on the activity of ceruloplasmin, an enzyme participating in Fe(II) elimination from blood plasma in human organism. Depletion of Fe(II) caused by ceruloplasmin isolated from healthy blood donors was compared to its decrease in a system containing both ceruloplasmin and the extract. The results have shown that addition of a particular amount of the extract elevates the effectiveness of ceruloplasmin in eliminating Fe(II) from the sample but only under physiological condition (pH 7.4; T 37°C). In a weak acidic solution, addition of the extract does not lead to any change in Fe(II) concentration.

PL

Jony żelaza, szczególnie jony żelazawe Fe(II), ze względu na wysoki potencjał oksydoredukcyjny mają zdolność generowania wolnych rodników, takich jak O2 •- i •OH. W pewnych stanach patologicznych, którym towarzyszy przeładowanie organizmu żelazem, ryzyko pojawienia się wolnych jonów Fe(II) inicjujących wiele procesów wolnorodnikowych jest bardzo prawdopodobne. W tym celu dąży się do opracowania terapii, które w chorobach żelazozależnych wspomogą naturalne mechanizmy usuwania reaktywnych jonów żelaza z organizmu. Ostatnio dużą uwagę poświęca się aktywnym substancjom obecnym w roślinach, szczególnie związkom polifenolowym, ze względu na ich silne właściwości chelatujące. Ten nowy kierunek badań wymaga jednak wnikliwej analizy, która wyjaśni mechanizm współdziałania substancji roślinnych z innymi biomolekułami zaangażowanymi w prawidłowy metabolizm żelaza w organizmie oraz rozstrzygnie o bezpieczeństwie ich stosowania. Celem badań było ustalenie wpływu ekstraktu z pestek porzeczki czarnej (Ribus nigrum), bogatego w związki polifenolowe, na aktywność ludzkiej ceruloplazminy, enzymu uczestniczącego w usuwaniu Fe(II) w organizmie ludzkim. Ubytek Fe(II) obserwowany w obecności ceruloplazminy porównywano z jego ubytkiem w mieszaninie ceruloplazmina-ekstrakt. Stwierdzono, że dodatek ekstraktu podnosi skuteczność ceruloplazminy w eliminowaniu Fe(II) ze środowiska. Istnieje więc przypuszczenie, że związki pochodzenia roślinnego takie jak polifenole mogą wspomagać naturalne mechanizmy eliminowania Fe(II) w organizmie.

5

Zastosowanie złóż chemicznie aktywnych do odżelaziania i odmanganiania wody

63%

Kaleta J. , Papciak D. , Puszkarewicz A.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

|

2011

|

tom z. 58, nr 2

113-125

PL

W artykule przedstawiono charakterystykę wybranych mas katalitycznych, dostępnych obecnie na polskim rynku. Materiały te służą do wysoko efektywnego usuwania związków żelaza i manganu z wody. Na złożach filtracyjnych (z testowanych mas) przeprowadzono badania laboratoryjne, które miały określić ich skuteczność w uzdatnianiu wód wgłębnych. Stwierdzono, że różnice wynikające z budowy i właściwości mas sprawiają, że każda z nich powinna być dokładnie dostosowana do jakości wody, zastosowanej technologii uzdatniania oraz warunków eksploatacyjnych. Wybór masy katalitycznej dla określonej SUW powinien być każdorazowo poprzedzony badaniami technologicznymi w skali laboratoryjnej. Z testowanych złóż filtracyjnych najbardziej uniwersalnym i efektywnym okazał się "zielony piasek" (masa MZ-10), naturalny zeolit pokryty dwutlenkiem manganu.

EN

The paper presents characteristics of selected catalytic masses available presently on Polish market. Such materials serve for highly-effective removal of iron and manganese compounds from water. A number of laboratory tests were carried out on filtration beds (of tested materials) in order to determine their effectiveness in underground water treatment. It was found that differences, resulting from the material structure and properties, lead to conclusion that each filtration bed should be precisely adjusted to the quality of water to be filtered, as well as to the applied watertreatment process and process-running conditions. Prior to any selection of catalytic mass for a specific water-treatment station, the process should first be tested in laboratory scale. Natural zeolite covered with manganese dioxide, also called a "green sand" and sold here as the MZ-10 mass, proved to be most universal and effective material from the filtration beds tested.

6

Generation of OH initiated by interaction of Fe2plus and Cuplus with dioxygen; comparison with the Fenton chemistry

63%

Urbanski N. K. , Beresewicz A.

Acta Biochimica Polonica

|

2000

|

tom 47

|

nr 4

EN

Iron and copper toxicity has been presumed to involve the formation of hydroxyl radical (.OH) from H2O2 in the Fenton reaction. The aim of this study was to verify that Fe2+-O2 and Cu+-O2 chemistry is capable of generating .OH in the quasi physiological environment of Krebs-Henseleit buffer (KH), and to compare the ability of the Fe2+-O2 system and of the Fenton system (Fe2+ + H2O2) to produce .OH. The addition of Fe2+ and Cu+ (0-20 µM) to KH resulted in a concentration-dependent increase in .OH formation, as measured by the salicylate method. While Fe3+ and Cu2+ (0-20 µM) did not result in .OH formation, these ions mediated significant .OH production in the presence of a number of reducing agents. The .OH yield from the reaction mediated by Fe2+ was increased by exogenous Fe3+ and Cu2+ and was prevented by the deoxygenation of the buffer and reduced by superoxide dismutase, catalase, and desferrioxamine. Addition of 1 µM, 5 µM or 10 µM Fe2+ to a range of H2O2 concentrations (the Fenton system) resulted in a H2O2-concentration-dependent rise in .OH formation. For each Fe2+ concentration tested, the .OH yield doubled when the ratio [H2O2]:[Fe2+] was raised from zero to one. In conclusion: (i) Fe2+-O2 and Cu+-O2 chemistry is capable of promoting .OH generation in the environment of oxygenated KH, in the absence of pre-existing superoxide and/or H2O2, and possibly through a mechanism initiated by the metal autoxidation; (ii) The process is enhanced by contaminating Fe3+ and Cu2+; (iii) In the presence of reducing agents also Fe3+ and Cu2+ promote the .OH formation; (iv) Depending on the actual [H2O2]:[Fe2+] ratio, the efficiency of the Fe2+-O2 chemistry to generate .OH is greater than or, at best, equal to that of the Fe2+-driven Fenton reaction.

7

The effect of copper, zinc and iron ions on induction of the reactive oxygen species production in tobacco by-2 cell suspension culture

63%

Zrobek-Sokolnik A. , Gorecki R. J.

Polish Journal of Natural Sciences. Supplement

|

2003

|

tom 01

8

Changes in the sorption of manganese and iron ions under the effect of differentiated oxygenation and reaction of the soil

63%

Jackowska I. , Gaszczyk R.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1993

|

tom 400

EN

The study is concerned with the course of sorption of Fe²⁺, Fe³⁺ and Mn²⁺ ions and with their washing, out with distilled water in sandy, loess, and loamy soils. Sorption was conducted according to the idynamic method. ODR and Eh were measured as indices of soil oxygenation. It was found that oxygen deficiency of the soils under study, with a change in their reaction from acid to neutral, resulted in: 1. an increase in the sorption of Fe²⁺ and Fe³⁺ ions, 2. an increase in the sorption of Mn²⁺ ions in the loamy soil only.

9

Wpływ metali na brunatnienie roztworów glikozy z lizyną

51%

Markuze Z.

|

nr 1

10

The influence of pH and Fe(II) ions on physicochemical properties of oxidised potato starch

51%

Pietrzyk S. , Fortuna T. , Ras L.

Electronic Journal of Polish Agricultural Universities. Series Food Science and Technology

|

2007

|

tom 10

|

nr 4

11

Oddzialywanie jonow platyny [IV] na jony zelaza [II] w glebie lessowej

51%

Bojanowska M. , Jackowska I.

Acta Agrophysica

|

2003

|

tom 02

|

nr 3[97]

509-517

12

Characterization of outer membrane proteins participating in iron transport in Pasteurella multocida serotype A3

51%

Puchalski A. , Dec M. , Wernicki A. , Urban-Chmiel R. , Gieral A.

Polish Journal of Veterinary Sciences

|

2010

|

tom 13

|

nr 1

121-127

EN

Iron-regulated outer membrane proteins (IROMPs) of P. multocida serotype A3, which function as receptors for complexes containing iron ions, are induced by iron deficiency in the bacterial growth environment. Analysis of an electrophoresis image of proteins isolated from bacteria grown on medium supplemented with 2,2'-dipyridyl revealed expression of 16 new proteins that were not noted in the case of the bacteria grown in standard conditions, with molecular weights from 30 to 160 kDa. Induction of IROMP expression occurred within 30 minutes after restricted iron conditions were established. In immunoblotting, distinct reactions were noted for proteins of molecular weight ranges of 25-49 kDa, 61-95 kDa, and 108-214 kDa. Proteins of the molecular weight of 68, 75 and 86 kDa were analysed using mass spectrometry and matched with the highest probability to proteins in the NCBI data base. Several dozen different proteins with similar amino acid sequences were matched to each sample.

13

Concentrations of macroelements, zinc and iron ions in water of the Upper Narew basin, NE Poland

51%

Skorbilowicz M.

Polish Journal of Environmental Studies

|

2010

|

tom 19

|

nr 2

397-405

EN

The purpose of present research was to evaluate the dynamics of concentration changes of macroelements as well as iron and zinc ions in the upper Narew River catchment (northeastern Poand). The following rivers and streams were selected: Narew, Supraśl, Horodnianka, Ruda, Małynka, Łoknica, and Rudnia. Calcium, magnesium, sodium, potassium, iron and zinc analyses were made using the flame AAS method. A gradual increase of macroelement contents in Narew water was found, which was the consequence of water supplies and surface runoffs. Our study revealed the differentiation of macroelements, iron and zinc concentrations in water of the upper Narew River, depending on the catchment character as well as spatial distribution of their point sources.

14

The role of labile iron pool in cardiovascular diseases

51%

Kruszewski M.

Acta Biochimica Polonica

|

2004

|

tom 51

|

nr 2

EN

Although multiple factors are associated with cardiovascular pathology, there is now an impressive body of evidence that free radicals and nonradical oxidants might cause a number of cardiovascular dysfunctions. Both direct damage to cellular components and/or oxidation of extracellular biomolecules, e.g. LDL, might be involved in the aetiology of cardiovascular diseases. The key molecules in this process seem to be iron and copper ions that catalyse formation of the highly reactive hydroxyl radical. Chelation of iron ions has a beneficial effect on the processes associated with the development of atherosclerosis and formation of post-ischemic lesions. These findings are indirectly supported by the increasing body of evidence that stored body iron plays a crucial role in pathogenesis of atherosclerosis and ischemia/reperfusion injury.

15

Jakosc wod powierzchniowych w gorskich mikrozlewniach rolniczo-lesnych

26%

Kanownik W. , Pijanowski Z.

Acta Scientiarum Polonorum. Formatio Circumiectus

|

2002

|

tom 01

|

nr 1-2

61-70