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Wyświetlanie 1-15 z 110
Tytuł:
Nanofiltration usage for fluoride removal in the sodium chloride presence
Autorzy:
Grzegorzek, Martyna
Powiązania:
https://bibliotekanauki.pl/articles/2073802.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fluoride
nanofiltration
sodium chloride
membrane processes
Opis:
Fluorine and sodium chloride are common elements present in the water environment. According to WHO guidelines fluoride content in water cannot be not higher than 1.5 mF-/dm3. Elevated fluoride content was observed all over the world and it leads to many health issues. It can be removed with the usage of various methods (ion exchange, membrane processes, adsorption, precipitation). In this paper fluoride removal with nanofiltration usage was described. Tests were performed with the application of Amicon 86400 filtration cells. Two types of commercial nanofiltration membranes NP010P and NP030P (Microdyn Nadir) were used. Transmembrane pressure was established as 0.3 MPa. For lower fluoride concentrations (5 mgF-/dm3) NF process allowed to decrease fluoride content under level 1.5 mgF-/dm3. Removal efficiency decreased with increasing fluoride content. Membrane NP030P showed better separation properties. Sodium chloride influenced removal efficiency as well as fluoride adsorption on/in membranes during the process. According to obtained data, better hydraulic properties exhibited membrane NP010P. For both membranes decrease in permeate flux in comparison to pure water was noticed what was observed. Relative permeability was lowered even to 0.32.
Źródło:
Archives of Environmental Protection; 2021, 47, 4; 98--108
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of fluoride ions by batch electrodialysis
Autorzy:
Majewska-Nowak, K.
Grzegorzek, M.
Kabsch-Korbutowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/207831.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fluorine compounds
biological materials
electrodialysis
fluoride concentrations
fluoride removal
związki fluoru
materiały biologiczne
elektrodializa
stężenie fluorków
usuwanie fluorków
Opis:
Suitability of conventional batch electrodialysis to fluoride removal from aqueous solutions has been investigated. The experiments were conducted with the use of laboratory installation PCCell BED-1 System at a constant current density (1.56 or 2.34 mA/cm2). The influence of initial fluoride and salt (NaCl) concentration, as well as the presence of organic matter on the process performance was studied. It was found that the separation efficiency increased upon decrease of initial fluoride content in model solutions. Permissible final concentration of fluorides in the product water (1.5 mg/dm3) was obtained for experiments with solutions of initial fluoride concentration equal to 5 mg F–/dm3 and 10 mg F–/dm3. The presence of humic acids in fluoride solutions subjected to electrodialysis treatment has no adverse effect on the defluorization and desalination efficiency. The calculated electrical energy demand depended on composition of fluoride solution and varied from 0.121 to 0.895 kWh/m3.
Źródło:
Environment Protection Engineering; 2015, 41, 1; 67-81
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluoride and environment
Autorzy:
Moudarzi, Fasser
Sheljani, Karikhan
Powiązania:
https://bibliotekanauki.pl/articles/1153715.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Environment
Fluorine
Opis:
The presence of fluoride in exceeding limits and related problems of drinking water prevailing in many parts of India is well documented. Fluoride in drinking water is known for having both beneficial and detrimental effects on health. Many solutions to these problems were also suggested. Fluoride from water or wastewater can be removed by an ion exchange/adsorption process or by a coagulation, precipitation process. The ion exchange/adsorption can be applied to either concentrated or diluted solutions and they are capable of achieving complete removal under proper conditions. The method suitable for a given situation needs to be judiciously selected considering the various aspects. The paper presents the current information on fluoride in environment and its effects on human health, as well as available methods of defluoridation in detail.
Źródło:
World News of Natural Sciences; 2016, 3; 1-11
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication of fluoride nanocrystals and their spectroscopic properties
Autorzy:
Pawlik, N.
Szpikowska-Sroka, B.
Goryczka, T.
Pisarski, W. A.
Powiązania:
https://bibliotekanauki.pl/articles/173278.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sol-gel method
glass-ceramics
fluoride nanocrystals
europium ions
Opis:
In this work, the fabrication of glass-ceramic materials containing MF3:Eu3++ (M = La, Gd) nanocrystals dispersed in silica sol-gel hosts has been presented. The transformation from liquid sols towards bulk samples was also examined based on IR measurements. The crystallization temperatures and formation of MF3 phases were verified based on TG/DSC analysis and XRD measurements. The optical properties of prepared Eu3+5D05D0 → 7FJ (J = 1–4) emission bands, which were recorded within the reddish-orange spectral area under near-UV illumination (λexc = 393 nm). Recorded luminescence spectra and double-exponential character of decay curves for prepared glass-ceramic samples indicated the successful migration of Eu3+ dopant ions from amorphous silica framework to low-phonon energy MF3 nanocrystal phases.
Źródło:
Optica Applicata; 2019, 49, 3; 415-426
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluoride concentration in teeth of the roe deer (Capreolus capreolus) and red deer (Cervus elaphus) from areas of Poland industrially uncontaminated with fluoride compounds
Autorzy:
Palczewska-Komsa, M.
Barczak, K.
Grocholewicz, K.
Buczkowska-Radlińska, J.
Piotrowski, P.R.
Sobolewska, E.
Powiązania:
https://bibliotekanauki.pl/articles/2087218.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fluoride
biomonitoring
teeth
herbivorous
mammals
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 1; 151-157
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimizing fluoride by coagulation on iron(III) hydroxide in drinkable water from Oasis region of Algeria
Autorzy:
Atia, D.
Hoggui, A.
Powiązania:
https://bibliotekanauki.pl/articles/411515.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Oasis region
minimizing fluoride
fluorosis
coagulation
drinkable water
Opis:
The drinkable water in oasis region of Algeria contains high quantity of fluoride which causes dental fluorosis. To reduce fluoride, we have chosen a sample with the biggest content of fluoride among many sources in order to coagulate it with FeSO4·H2O. After that the parameters influencing (concentration, pH, temperature) are studied to choose the best conditions for better reduction.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 7, 1; 23-29
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluoride content in the Antarctic krill (Euphausia superba Dana) in relation to its biological condition and to the fishery region
Autorzy:
Bykowski, Piotr
Kowalczuk, Maria
Powiązania:
https://bibliotekanauki.pl/articles/2053305.pdf
Data publikacji:
1986
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctic
krill
fluoride content
Źródło:
Polish Polar Research; 1986, 7, 3; 283-287
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of fluoride ions by ultrafiltration in the presence of cationic surfactants
Autorzy:
Klimonda, A.
Grzegorzek, M.
Majewska-Nowak, K.
Powiązania:
https://bibliotekanauki.pl/articles/208133.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ultrafiltration
fluoride ions
surfactant
membrane
ultrafiltracja
jony fluorkowe
fluor
surfaktanty
membrany
Opis:
The usability of surfactant-aided ultrafiltration for removal of fluoride ions from aqueous solutions has been investigated. The experiments were conducted with the use of cellulose and polyethersulfone membranes. Fluoride solutions containing 10 and 100 mg F–/dm3 and cationic surfactants: octadecylamine acetate (ODA) and hexadecylpyridium chloride (CPC) were used in the experiments. The concentration of surfactants amounted to 320–960 mg/dm3. Ultrafiltration process was run under a trans-membrane pressure of 0.2 MPa. In the course of experiments, the effects of initial fluoride concentration, surfactant concentration and membrane type on the fluoride retention coefficient as well as the permeate flux were studied. It was found that the increase of the surfactant concentration effected in improvement of the separation efficiency. On contrary, the permeate flux decreased upon increase of the surfactant concentration. The process efficiency was also strongly influenced by the membrane and surfactant type. The permissible concentration of fluoride in the final product (below 1.5 mg F–/dm3) was obtained for the test with initial solutions containing 10 mg F–/dm3, polyethersulfone membrane and CPC con-centration equal to 644 and 966 mg/dm3.
Źródło:
Environment Protection Engineering; 2017, 43, 2; 5-13
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorptive purification of aqueous solution from fluoride ions by carbonaceous materials
Autorzy:
Gąsior, D.
Powiązania:
https://bibliotekanauki.pl/articles/297619.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
water treatment
adsorption
fluoride ions
carbonaceous sorption materials
uzdatnianie wody
adsorpcja
jony fluorkowe
sorpcyjne materiały węglowe
Opis:
Fluoride is a widely available element and is the 13th on the list of most common elements in nature. Fluorides are present in all environmental components: water, soil, air and living organisms. It finds its way into water as a result of rocks weathering and leaching, as well as precipitation along with gas and dust pollution of anthropogenic origin. In more and more areas of Poland exceedances are observed, relative to the maximum permitted levels established for fluoride concentration. The level of environmental pollution by fluoride ions increases along with the development of industrial activity of humans and the widespread use of fluorine compounds in agriculture and dental prophylaxis. Currently fluorine compounds are recognized as one of the most dangerous pollutants, contributing to environmental contamination. Fluoride ions can be removed from aqueous mediums using membrane techniques, adsorption, chemical precipitation, coagulation, electrocoagulation or ion exchange. Using adsorption processes is a very good method for water purification from fluoride ions due to its high effectiveness and simple application. The aim of this paper was to research fluoride ion adsorption statics and kinetics for two commercially available carbon materials: activated carbon (W1) and charcoal (W2). Adsorption tests were conducted in static conditions. Concentrations of fluoride ions in the samples were analyzed using the ion chromatography method. The adsorption kinetic occurred according to the pseudo-secondorder kinetic model. Process equilibrium was achieved after 40 minutes of contact between the adsorbent and the adsorbtive when using W1 and after an hour when using W2. Equilibrium adsorption was described using Freundlich’s equations. Freundlich isotherms were characterized by large correlation coefficients (R2 > 0.92). Adsorption capacities of both materials strongly depended on the pH solution. The highest adsorption capacities for both activated carbon (0.199 mg/g) and charcoal (0.169 mg/g) was observed where the initial pH = 2 and the 20 mg/L fluoride concentration. The efficiency of fluoride ions removal from aqueous solutions depended on the process conditions, the initial fluoride concentration, pH, companion ions presence, for example OH‒. The greatest adsorption efficiency (51.9% for a 5 mg/L initial concentration) was exhibited by charcoal.
Źródło:
Inżynieria i Ochrona Środowiska; 2016, 19, 3; 307-318
1505-3695
2391-7253
Pojawia się w:
Inżynieria i Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Fluoride and Bentonite on Biochemical Aspects of Oxidative Stress in Pisum sativum
Autorzy:
Śnioszek, M.
Telesiński, A.
Smolik, B.
Zakrzewska, H.
Powiązania:
https://bibliotekanauki.pl/articles/125180.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
fluoride
bentonite
oxidative stress
antioxidants
Pisum sativum
Opis:
Fluoride is regarded as one of the strongest oxidants, which causes oxidative changes in cells of living organisms. It may both increase the content of reactive oxygen species and inhibit the activity of antioxidative enzyme. In recent years, many researchers successfully used the properties of clay minerals in the sorption of fluoride ion from water. This raises the question of the possibility of limiting the effect of fluorine on the negative changes in plants by adding bentonite to soil. A two-year pot experiment was carried out in the Greenhouse of West Pomeranian University of Technology in Szczecin, on loamy sand and sandy loam. Each sample of soil was mixed with three different concentrations of bentonite – 1, 5, 10% of dry weight (DW) of the soil and then treated with 30 mmol of F- per 1 kg of dry weight of the soil in a form of NaF solution. A control series was prepared for each soil, to which no additives were added. The medium prepared in such way was transferred to plastic pots (3 kg each) and seeded with 16 pea seeds of Pisum sativum. In three phases of pea development (4 leaves unfolded, flowering and development of fruit), fresh leaf samples were collected and the concentrations of ascorbic acid, reduced glutathione, total flavonoids and total polyphenols were measured. Sodium fluoride introduced to the soil changed the level of antioxidant parameters in the plant, which may suggest that fluoride is involved in the formation of reactive oxygen species, resulting in oxidative stress. Bentonite in a dosage of 10% reduced the toxic effects of fluoride on the oxidative balance and morphological changes in the plant, which was observed especially for loamy sand, naturally poor in clay minerals.
Źródło:
Journal of Ecological Engineering; 2018, 19, 2; 164-171
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Optoelectronic properties of Fluoride tin oxides/porous silicon/p-Silicon heterojunction
Autorzy:
Hadi, H. A.
Powiązania:
https://bibliotekanauki.pl/articles/411926.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
porous silicon
electrochemical etching
spray pyrolysis
fluoride-doped tin oxide film
nanostructures
SEM
AFM
photodetector
Opis:
In this paper, formation of a nanostructure semi transparence fluoride tin oxides (FTO) by spray pyrolysis technique on porous silicon PS layer. Porous silicon PS layer was prepared by anodization of p-type silicon wafers to fabricate of the UV- Visible Fluoride-doped tin oxide /Porous silicon /p-Si heterojunction photodetector. Optical properties of FTO thin films were measured. The optical band gap of 3.77 eV for SnO2 : F for film was deduced. From (I-V) and (C-V) measurements, the barrier ØB height for FTO/PS diode was of 0.77, and the built in voltage Vbi, which was of 0.95 V. External quantum efficiency was 55 % at 500 nm which corresponding to peak responsivity of 1.15 A/W at 1 V bias. The PS band gap in the vicinity of PS/c-Si heterojunction was 1.38 eV.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 2; 142-152
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic Study on the Preparation of Aluminum Fluoride Based on Fluosilicic Acid
Autorzy:
Chen, Gaoxiang
Yang, Xingdong
Qu, Jiyan
Luo, Jianhong
Zhang, Zhiye
Sun, Lan
Powiązania:
https://bibliotekanauki.pl/articles/1849322.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
kinetic study
fluosilicic acid
aluminum fluoride
uncreated-core model
Opis:
Reasonable mathematical derivation and mechanism model in the process of producing aluminum fluoride by fluosilicic acid is the key to the industrial treatment of fluorine resources in the tail gas of phosphate ore. In this work, aluminum fluoride was generated directly by fluosilicic acid to extract fl uorine from the tail gas of phosphate rock. The uncreated-core model dominated by interfacial reaction and the uncreated-core model dominated by internal diffusion-reaction were then respectively utilized to describe the reaction kinetics of the generation of aluminum fluoride. The result showed that the uncreated-core model was dominated by interface reaction and internal diffusion, the apparent reaction order n = 1, and the activation energy Ea = 30.8632 kJ . mol–1. Product characterization and kinetic analysis were employed to deduce the reaction mechanism of preparing aluminum fluoride. The theoretical basis for the low-cost recycling of fluorine resources in the tail gas of industrial phosphate ore was provided in this work.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 3; 10-16
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of process-material conditions on the structure and biological properties of electrospun polyvinylidene fluoride fibers
Autorzy:
Zaszczyńska, A.
Sajkiewicz, P. Ł.
Gradys, A.
Tymkiewicz, R.
Urbanek, O.
Kołbuk, D.
Powiązania:
https://bibliotekanauki.pl/articles/200237.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
scaffolds
electrospinning
polyvinylidene fluoride
tissue engineering
Opis:
Polyvinylidene fluoride (PVDF) is one of the most important piezoelectric polymers. Piezoelectricity in PVDF appears in polar b and ɣ phases. Piezoelectric fibers obtained by means of electrospinning may be used in tissue engineering (TE) as a smart analogue of the natural extracellular matrix (ECM). We present results showing the effect of rotational speed of the collecting drum on morphology, phase content and in vitro biological properties of PVDF nonwovens. Morphology and phase composition were analyzed using scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR), respectively. It was shown that increasing rotational speed of the collector leads to an increase in fiber orientation, reduction in fiber diameter and considerable increase of polar phase content, both b and g. In vitro cell culture experiments, carried out with the use of ultrasounds in order to generate electrical potential via piezoelectricity, indicate a positive effect of polar phases on fibroblasts. Our preliminary results demonstrate that piezoelectric PVDF scaffolds are promising materials for tissue engineering applications, particularly for neural tissue regeneration, where the electric potential is crucial.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 627-633
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes of Fluoride Content in Sand From Sandboxes Located on Playgrounds in Police (West Pomerania, Poland)
Autorzy:
Telesiński, A.
Człaczyńska-Podolska, M.
Węgrzynowski, Z.
Biczak, R.
Telesińska, N.
Powiązania:
https://bibliotekanauki.pl/articles/123733.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
distance from emitter
fluoride
risk assessment
sandboxes
Opis:
The aim of the study was to determine fluoride content in sand from sandboxes in Police town (West Pomerania, Poland). This area is exposed to excessive emissions of fluoride compounds because of the proximity of chemical plants. The sand samples were collected five times in a period from March to November in 2016. Fluoride content was determined using the potentiometric method with an ion-selective fluoride electrode. The obtained results showed that fluoride content was ranged from 0.09 to 1.48 mg·kg-1 dm. The lowest fluoride content was recorded in the sand collected in place, which was the closest to the emitter, and the largest in the samples from sandbox, which was furthest from the emitter. Analyzing the changes in the content of this element over time, the largest fluoride concentration of sand occurred in July or September depending on location. Pearson correlation coefficient at p < 0.05 (r = 0.925) showed a significant positive correlation between fluoride content and the distance from fluoride emitter.
Źródło:
Journal of Ecological Engineering; 2017, 18, 5; 168-172
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protective effects of quercetin on cadmium fluoride induced oxidative stress at different intervals of time in mouse liver
Autorzy:
Zargar, Seema
Siddiqi, Nikhat
Al Daihan, Sooad
Wani, Tanveer
Powiązania:
https://bibliotekanauki.pl/articles/1039092.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cadmium fluoride
quercetin
oxidative stress
flavonoids
histology
adverse effect
Opis:
Quercetin, a member of the flavonoid family is a major antioxidant acquired in humans by food consumption, while Cadmium fluoride (CdF2) is one of the naturally occurring chemicals having adverse effects. The protective effect of quercetin on time dependent oxidative damage induced in mice liver by CdF2 was studied in the following groups of mice consisting of six mice each: (i) control group; (ii) mice treated with single i.p injection of 2 mg/kg bw CdF2 for 24 h; (iii) mice treated with single i.p injection of 2 mg/kg bw CdF2 for 48 h; (iv) mice treated with single i.p injection of quercetin (100 mg/kg bw); (v) mice treated with i.p injection of 100 mg/kg bw of quercetin followed by i.p injection of CdF2 (2 mg/kg bw) for 24 h; and (vi) mice treated with i.p injection of 100mg/kg bw of quercetin followed by CdF2 (2 mg/kg bw) for 48 h. Administration of quercetin two hours before CdF2 significantly reduced the biochemical alterations in reduced glutathione, ascorbic acid, lipid peroxidation, super oxide dismutase, catalase and total protein (p<0.05). Histopathology also showed the protective effect of quercetin. The livers treated with CdF2 were atrophic, markedly nodular, inflamed and necrotic. However, this effect was reduced to a minimum in the mice pre-treated for two hours with quercetin.
Źródło:
Acta Biochimica Polonica; 2015, 62, 2; 207-213
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 110

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